CVE-2025-39993: media: rc: fix races with imon_disconnect()

Published Oct 15, 2025
·
Updated

In the Linux kernel, the following vulnerability has been resolved:

media: rc: fix races with imondisconnect()

Syzbot reports a KASAN issue as below: BUG: KASAN: use-after-free in createpipe include/linux/usb.h:1945 [inline] BUG: KASAN: use-after-free in sendpacket+0xa2d/0xbc0 drivers/media/rc/imon.c:627 Read of size 4 at addr ffff8880256fb000 by task syz-executor314/4465

CPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: <TASK> dumpstack lib/dumpstack.c:88 [inline] dumpstacklvl+0xcd/0x134 lib/dumpstack.c:106 printaddressdescription mm/kasan/report.c:317 [inline] printreport.cold+0x2ba/0x6e9 mm/kasan/report.c:433 kasanreport+0xb1/0x1e0 mm/kasan/report.c:495 createpipe include/linux/usb.h:1945 [inline] sendpacket+0xa2d/0xbc0 drivers/media/rc/imon.c:627 vfdwrite+0x2d9/0x550 drivers/media/rc/imon.c:991 vfswrite+0x2d7/0xdd0 fs/readwrite.c:576 ksyswrite+0x127/0x250 fs/readwrite.c:631 dosyscallx64 arch/x86/entry/common.c:50 [inline] dosyscall64+0x35/0xb0 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+0x63/0xcd

The iMON driver improperly releases the usbdevice reference in imondisconnect without coordinating with active users of the device.

Specifically, the fields usbdevintf0 and usbdevintf1 are not protected by the users counter (ictx->users). During probe, imoninitintf0 or imoninitintf1 increments the usbdevice reference count depending on the interface. However, during disconnect, usbputdev is called unconditionally, regardless of actual usage.

As a result, if vfdwrite or other operations are still in progress after disconnect, this can lead to a use-after-free of the usbdevice pointer.

Thread 1 vfdwrite Thread 2 imondisconnect ... if usbputdev(ictx->usbdevintf0) else usbputdev(ictx->usbdevintf1) ... while sendpacket if pipe = usbsndintpipe( ictx->usbdevintf0) UAF else pipe = usbsndctrlpipe( ictx->usbdevintf0, 0) UAF

Guard access to usbdevintf0 and usbdevintf1 after disconnect by checking ictx->disconnected in all writer paths. Add early return with -ENODEV in sendpacket(), vfdwrite(), lcdwrite() and displayopen() if the device is no longer present.

Set and read ictx->disconnected under ictx->lock to ensure memory synchronization. Acquire the lock in imondisconnect() before setting the flag to synchronize with any ongoing operations.

Ensure writers exit early and safely after disconnect before the USB core proceeds with cleanup.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Affected Software

233 affected componentsFixes available
Linux Linux kernel
ubuntu/linux*
ubuntu/linux-aws<4.4.0-1151.157
4.4.0-1151.157
ubuntu/linux-azure<4.15.0-1196.211~14.04.1
4.15.0-1196.211~14.04.1
ubuntu/linux-lts-xenial<4.4.0-277.311~14.04.1
4.4.0-277.311~14.04.1
ubuntu/linux<4.4.0-277.311
4.4.0-277.311
ubuntu/linux-aws<4.4.0-1189.204
4.4.0-1189.204
ubuntu/linux-aws-hwe<4.15.0-1188.201~16.04.1
4.15.0-1188.201~16.04.1
ubuntu/linux-azure<4.15.0-1196.211~16.04.1
4.15.0-1196.211~16.04.1
ubuntu/linux-gcp<4.15.0-1181.198~16.04.1
4.15.0-1181.198~16.04.1
ubuntu/linux-hwe<4.15.0-246.258~16.04.1
4.15.0-246.258~16.04.1
ubuntu/linux-kvm<4.4.0-1152.163
4.4.0-1152.163
ubuntu/linux-oracle<4.15.0-1150.161~16.04.1
4.15.0-1150.161~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1121.128
4.4.0-1121.128
ubuntu/linux-fips*
ubuntu/linux<4.15.0-246.258
4.15.0-246.258
ubuntu/linux-aws<4.15.0-1188.201
4.15.0-1188.201
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-aws-5.4<5.4.0-1153.163~18.04.1
5.4.0-1153.163~18.04.1
ubuntu/linux-azure*
ubuntu/linux-azure-4.15<4.15.0-1196.211
4.15.0-1196.211
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-5.4<5.4.0-1156.163~18.04.1
5.4.0-1156.163~18.04.1
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-4.15<4.15.0-1181.198
4.15.0-1181.198
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-5.4<5.4.0-1156.165~18.04.1
5.4.0-1156.165~18.04.1
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-5.4<5.4.0-224.244~18.04.1
5.4.0-224.244~18.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-ibm-5.4<5.4.0-1099.104~18.04.1
5.4.0-1099.104~18.04.1
ubuntu/linux-kvm<4.15.0-1170.175
4.15.0-1170.175
ubuntu/linux-oem*
ubuntu/linux-oracle<4.15.0-1150.161
4.15.0-1150.161
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-oracle-5.4<5.4.0-1151.161~18.04.1
5.4.0-1151.161~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1136.149~18.04.1
5.4.0-1136.149~18.04.1
ubuntu/linux-aws-fips<4.15.0-2126.132
4.15.0-2126.132
ubuntu/linux-azure-fips<4.15.0-2105.111
4.15.0-2105.111
ubuntu/linux-fips<4.15.0-1143.155
4.15.0-1143.155
ubuntu/linux-gcp-fips<4.15.0-2089.95
4.15.0-2089.95
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-224.244
5.4.0-224.244
ubuntu/linux-aws<5.4.0-1153.163
5.4.0-1153.163
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.15<5.15.0-1098.105~20.04.1
5.15.0-1098.105~20.04.1
ubuntu/linux-aws-5.8*
ubuntu/linux-azure<5.4.0-1156.163
5.4.0-1156.163
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.15<5.15.0-1102.111~20.04.1
5.15.0-1102.111~20.04.1
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
ubuntu/linux-bluefield<5.4.0-1112.119
5.4.0-1112.119
ubuntu/linux-gcp<5.4.0-1156.165
5.4.0-1156.165
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.15<5.15.0-1098.107~20.04.1
5.15.0-1098.107~20.04.1
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-gkeop*
ubuntu/linux-gkeop-5.15*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.15<5.15.0-164.174~20.04.1
5.15.0-164.174~20.04.1
ubuntu/linux-hwe-5.8*
ubuntu/linux-ibm<5.4.0-1099.104
5.4.0-1099.104
ubuntu/linux-ibm-5.15<5.15.0-1092.95~20.04.1
5.15.0-1092.95~20.04.1
ubuntu/linux-intel-5.13*
ubuntu/linux-intel-iotg-5.15<5.15.0-1093.99~20.04.1
5.15.0-1093.99~20.04.1
ubuntu/linux-iot<5.4.0-1057.60
5.4.0-1057.60
ubuntu/linux-kvm<5.4.0-1140.149
5.4.0-1140.149
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-164.174~20.04.1
5.15.0-164.174~20.04.1
ubuntu/linux-nvidia-tegra-5.15<5.15.0-1050.50~20.04.1
5.15.0-1050.50~20.04.1
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle<5.4.0-1151.161
5.4.0-1151.161
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.15<5.15.0-1095.101~20.04.1
5.15.0-1095.101~20.04.1
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi<5.4.0-1136.149
5.4.0-1136.149
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.15<5.15.0-1093.97~20.04.2
5.15.0-1093.97~20.04.2
ubuntu/linux-riscv-5.8*
ubuntu/linux-xilinx-zynqmp<5.4.0-1071.75
5.4.0-1071.75
ubuntu/linux-aws-fips<5.4.0-1153.163+fips1
5.4.0-1153.163+fips1
ubuntu/linux-azure-fips<5.4.0-1157.164+fips1
5.4.0-1157.164+fips1
ubuntu/linux-fips<5.4.0-1127.137
5.4.0-1127.137
ubuntu/linux-gcp-fips<5.4.0-1156.165+fips1
5.4.0-1156.165+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.15.0-164.174
5.15.0-164.174
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1098.105
5.15.0-1098.105
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-aws-6.8<6.8.0-1044.46~22.04.1
6.8.0-1044.46~22.04.1
ubuntu/linux-azure<5.15.0-1102.111
5.15.0-1102.111
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-6.8<6.8.0-1044.50~22.04.1
6.8.0-1044.50~22.04.1
ubuntu/linux-azure-fde<5.15.0-1102.111.1
5.15.0-1102.111.1
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-azure-fde-6.8<6.8.0-1046.53~22.04.1
6.8.0-1046.53~22.04.1
ubuntu/linux-gcp<5.15.0-1098.107
5.15.0-1098.107
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gcp-6.8<6.8.0-1045.48~22.04.1
6.8.0-1045.48~22.04.1
ubuntu/linux-gke<5.15.0-1094.100
5.15.0-1094.100
ubuntu/linux-gkeop<5.15.0-1081.89
5.15.0-1081.89
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-hwe-6.8<6.8.0-90.91~22.04.1
6.8.0-90.91~22.04.1
ubuntu/linux-ibm<5.15.0-1092.95
5.15.0-1092.95
ubuntu/linux-ibm-6.8<6.8.0-1042.42~22.04.1
6.8.0-1042.42~22.04.1
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg<5.15.0-1093.99
5.15.0-1093.99
ubuntu/linux-kvm<5.15.0-1090.95
5.15.0-1090.95
ubuntu/linux-lowlatency<5.15.0-164.174
5.15.0-164.174
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-lowlatency-hwe-6.8<6.8.0-90.91.1~22.04.1
6.8.0-90.91.1~22.04.1
ubuntu/linux-nvidia<5.15.0-1093.94
5.15.0-1093.94
ubuntu/linux-nvidia-6.2*
ubuntu/linux-nvidia-6.5*
ubuntu/linux-nvidia-6.8<6.8.0-1044.47~22.04.1
6.8.0-1044.47~22.04.1
ubuntu/linux-nvidia-tegra<5.15.0-1050.50
5.15.0-1050.50
ubuntu/linux-nvidia-tegra-igx<5.15.0-1039.39
5.15.0-1039.39
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-oem-6.5*
ubuntu/linux-oracle<5.15.0-1095.101
5.15.0-1095.101
ubuntu/linux-oracle-6.5*
ubuntu/linux-oracle-6.8<6.8.0-1041.42~22.04.1
6.8.0-1041.42~22.04.1
ubuntu/linux-raspi<5.15.0-1092.95
5.15.0-1092.95
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-riscv-6.5*
ubuntu/linux-riscv-6.8<6.8.0-90.91~22.04.1
6.8.0-90.91~22.04.1
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-starfive-6.5*
ubuntu/linux-xilinx-zynqmp<5.15.0-1062.66
5.15.0-1062.66
ubuntu/linux-bluefield<5.15.0-1082.84
5.15.0-1082.84
ubuntu/linux-intel-iot-realtime<5.15.0-1090.92
5.15.0-1090.92
ubuntu/linux-realtime<5.15.0-1097.106
5.15.0-1097.106
ubuntu/linux-realtime-6.8<6.8.1-1039.40~22.04.1
6.8.1-1039.40~22.04.1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-aws-fips<5.15.0-1098.105+fips1
5.15.0-1098.105+fips1
ubuntu/linux-azure-fips<5.15.0-1102.111+fips1
5.15.0-1102.111+fips1
ubuntu/linux-fips<5.15.0-164.174+fips1
5.15.0-164.174+fips1
ubuntu/linux-gcp-fips<5.15.0-1098.107+fips1
5.15.0-1098.107+fips1
ubuntu/linux<6.8.0-90.91
6.8.0-90.91
ubuntu/linux-aws<6.8.0-1044.46
6.8.0-1044.46
ubuntu/linux-aws-6.14<6.14.0-1018.18~24.04.1
6.14.0-1018.18~24.04.1
ubuntu/linux-azure<6.8.0-1044.50
6.8.0-1044.50
ubuntu/linux-azure-6.11*
ubuntu/linux-azure-6.14<6.14.0-1017.17~24.04.1
6.14.0-1017.17~24.04.1
ubuntu/linux-azure-fde<6.8.0-1046.53
6.8.0-1046.53
ubuntu/linux-azure-fde-6.14*
ubuntu/linux-azure-nvidia<6.8.0-1029.32
6.8.0-1029.32
ubuntu/linux-azure-nvidia-6.14*
ubuntu/linux-gcp<6.8.0-1045.48
6.8.0-1045.48
ubuntu/linux-gcp-6.11*
ubuntu/linux-gcp-6.14*
ubuntu/linux-gke<6.8.0-1041.46
6.8.0-1041.46
ubuntu/linux-gkeop<6.8.0-1028.31
6.8.0-1028.31
ubuntu/linux-hwe-6.11*
ubuntu/linux-ibm<6.8.0-1042.42
6.8.0-1042.42
ubuntu/linux-lowlatency<6.8.0-90.91.1
6.8.0-90.91.1
ubuntu/linux-lowlatency-hwe-6.11*
ubuntu/linux-nvidia<6.8.0-1044.47
6.8.0-1044.47
ubuntu/linux-nvidia-6.11*
ubuntu/linux-nvidia-lowlatency<6.8.0-1044.47.1
6.8.0-1044.47.1
ubuntu/linux-nvidia-tegra<6.8.0-1020.20
6.8.0-1020.20
ubuntu/linux-oem-6.11*
ubuntu/linux-oem-6.14<6.14.0-1017.17
6.14.0-1017.17
ubuntu/linux-oem-6.8*
ubuntu/linux-oracle<6.8.0-1041.42
6.8.0-1041.42
ubuntu/linux-oracle-6.14*
ubuntu/linux-raspi<6.8.0-1044.48
6.8.0-1044.48
ubuntu/linux-raspi-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-6.14<6.14.0-37.37.1~24.04.1
6.14.0-37.37.1~24.04.1
ubuntu/linux-xilinx<6.8.0-1021.22
6.8.0-1021.22
ubuntu/linux-bluefield<6.8.0-1014.18
6.8.0-1014.18
ubuntu/linux-raspi-realtime<6.8.0-2035.36
6.8.0-2035.36
ubuntu/linux-realtime<6.8.1-1039.40
6.8.1-1039.40
ubuntu/linux-realtime-6.14<6.14.0-1017.17~24.04.1
6.14.0-1017.17~24.04.1
ubuntu/linux-aws-fips<6.8.0-1044.46+fips1
6.8.0-1044.46+fips1
ubuntu/linux-azure-fips<6.8.0-1044.50+fips1
6.8.0-1044.50+fips1
ubuntu/linux-fips<6.8.0-90.91+fips1
6.8.0-90.91+fips1
ubuntu/linux-gcp-fips<6.8.0-1045.48+fips1
6.8.0-1045.48+fips1
ubuntu/linux<6.17.0-6.6
6.17.0-6.6
ubuntu/linux-aws<6.17.0-1003.3
6.17.0-1003.3
ubuntu/linux-azure<6.17.0-1006.6
6.17.0-1006.6
ubuntu/linux-azure-fde*
ubuntu/linux-gcp<6.17.0-1003.3
6.17.0-1003.3
ubuntu/linux-oracle<6.17.0-1003.3
6.17.0-1003.3
ubuntu/linux-raspi<6.17.0-1004.4
6.17.0-1004.4
ubuntu/linux-realtime<6.17.0-1002.3
6.17.0-1002.3
ubuntu/linux-riscv<6.17.0-6.6.1
6.17.0-6.6.1
debian/linux
6.1.176-16.1.190-16.12.107-16.12.115-27.2.15-17.3.3-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1151.157
  2. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1196.211~14.04.1
  3. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-277.311~14.04.1
  4. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-277.311
  5. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1189.204
  6. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1188.201~16.04.1
  7. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1196.211~16.04.1
  8. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1181.198~16.04.1
  9. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-246.258~16.04.1
  10. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1152.163
  11. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1150.161~16.04.1
  12. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1121.128
  13. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-246.258
  14. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1188.201
  15. Upgrade

    Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1153.163~18.04.1
  16. Upgrade

    Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1196.211
  17. Upgrade

    Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1156.163~18.04.1
  18. Upgrade

    Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1181.198
  19. Upgrade

    Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1156.165~18.04.1
  20. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-224.244~18.04.1
  21. Upgrade

    Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1099.104~18.04.1
  22. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1170.175
  23. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1150.161
  24. Upgrade

    Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1151.161~18.04.1
  25. Upgrade

    Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1136.149~18.04.1
  26. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2126.132
  27. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2105.111
  28. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-1143.155
  29. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2089.95
  30. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.4.0-224.244
  31. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1153.163
  32. Upgrade

    Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1098.105~20.04.1
  33. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.4.0-1156.163
  34. Upgrade

    Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1102.111~20.04.1
  35. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 5.4.0-1112.119
  36. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1156.165
  37. Upgrade

    Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1098.107~20.04.1
  38. Upgrade

    Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-164.174~20.04.1
  39. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1099.104
  40. Upgrade

    Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1092.95~20.04.1
  41. Upgrade

    Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1093.99~20.04.1
  42. Upgrade

    Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.

    Fixed in 5.4.0-1057.60
  43. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1140.149
  44. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-164.174~20.04.1
  45. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1050.50~20.04.1
  46. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.4.0-1151.161
  47. Upgrade

    Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1095.101~20.04.1
  48. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.4.0-1136.149
  49. Upgrade

    Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1093.97~20.04.2
  50. Upgrade

    Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1071.75
  51. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1153.163+fips1
  52. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1157.164+fips1
  53. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1127.137
  54. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1156.165+fips1
  55. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.15.0-164.174
  56. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.15.0-1098.105
  57. Upgrade

    Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.46~22.04.1
  58. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.15.0-1102.111
  59. Upgrade

    Upgrade ubuntu/linux-azure-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.50~22.04.1
  60. Upgrade

    Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.

    Fixed in 5.15.0-1102.111.1
  61. Upgrade

    Upgrade ubuntu/linux-azure-fde-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1046.53~22.04.1
  62. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.15.0-1098.107
  63. Upgrade

    Upgrade ubuntu/linux-gcp-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1045.48~22.04.1
  64. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 5.15.0-1094.100
  65. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 5.15.0-1081.89
  66. Upgrade

    Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-90.91~22.04.1
  67. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 5.15.0-1092.95
  68. Upgrade

    Upgrade ubuntu/linux-ibm-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1042.42~22.04.1
  69. Upgrade

    Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.

    Fixed in 5.15.0-1093.99
  70. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.15.0-1090.95
  71. Upgrade

    Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.15.0-164.174
  72. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-90.91.1~22.04.1
  73. Upgrade

    Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.

    Fixed in 5.15.0-1093.94
  74. Upgrade

    Upgrade ubuntu/linux-nvidia-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.47~22.04.1
  75. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.

    Fixed in 5.15.0-1050.50
  76. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.

    Fixed in 5.15.0-1039.39
  77. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.15.0-1095.101
  78. Upgrade

    Upgrade ubuntu/linux-oracle-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1041.42~22.04.1
  79. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.15.0-1092.95
  80. Upgrade

    Upgrade ubuntu/linux-riscv-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-90.91~22.04.1
  81. Upgrade

    Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.

    Fixed in 5.15.0-1062.66
  82. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 5.15.0-1082.84
  83. Upgrade

    Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.

    Fixed in 5.15.0-1090.92
  84. Upgrade

    Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.

    Fixed in 5.15.0-1097.106
  85. Upgrade

    Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.1-1039.40~22.04.1
  86. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1098.105+fips1
  87. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1102.111+fips1
  88. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-164.174+fips1
  89. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1098.107+fips1
  90. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 6.8.0-90.91
  91. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.46
  92. Upgrade

    Upgrade ubuntu/linux-aws-6.14 to a version that resolves this vulnerability.

    Fixed in 6.14.0-1018.18~24.04.1
  93. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.50
  94. Upgrade

    Upgrade ubuntu/linux-azure-6.14 to a version that resolves this vulnerability.

    Fixed in 6.14.0-1017.17~24.04.1
  95. Upgrade

    Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.

    Fixed in 6.8.0-1046.53
  96. Upgrade

    Upgrade ubuntu/linux-azure-nvidia to a version that resolves this vulnerability.

    Fixed in 6.8.0-1029.32
  97. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 6.8.0-1045.48
  98. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 6.8.0-1041.46
  99. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 6.8.0-1028.31
  100. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 6.8.0-1042.42
  101. Upgrade

    Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.

    Fixed in 6.8.0-90.91.1
  102. Upgrade

    Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.47
  103. Upgrade

    Upgrade ubuntu/linux-nvidia-lowlatency to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.47.1
  104. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.

    Fixed in 6.8.0-1020.20
  105. Upgrade

    Upgrade ubuntu/linux-oem-6.14 to a version that resolves this vulnerability.

    Fixed in 6.14.0-1017.17
  106. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 6.8.0-1041.42
  107. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.48
  108. Upgrade

    Upgrade ubuntu/linux-riscv-6.14 to a version that resolves this vulnerability.

    Fixed in 6.14.0-37.37.1~24.04.1
  109. Upgrade

    Upgrade ubuntu/linux-xilinx to a version that resolves this vulnerability.

    Fixed in 6.8.0-1021.22
  110. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 6.8.0-1014.18
  111. Upgrade

    Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.

    Fixed in 6.8.0-2035.36
  112. Upgrade

    Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.

    Fixed in 6.8.1-1039.40
  113. Upgrade

    Upgrade ubuntu/linux-realtime-6.14 to a version that resolves this vulnerability.

    Fixed in 6.14.0-1017.17~24.04.1
  114. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.46+fips1
  115. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 6.8.0-1044.50+fips1
  116. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 6.8.0-90.91+fips1
  117. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 6.8.0-1045.48+fips1
  118. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 6.17.0-6.6
  119. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 6.17.0-1003.3
  120. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 6.17.0-1006.6
  121. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 6.17.0-1003.3
  122. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 6.17.0-1003.3
  123. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 6.17.0-1004.4
  124. Upgrade

    Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.

    Fixed in 6.17.0-1002.3
  125. Upgrade

    Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.

    Fixed in 6.17.0-6.6.1
  126. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.15-1Fixed in 7.3.3-1
  127. Compensating control

    In the Linux iMON driver, acquire ictx->lock in imon_disconnect() before setting ictx->disconnected; set and read ictx->disconnected under ictx->lock, check it in all writer paths, and return -ENODEV early from send_packet(), vfd_write(), lcd_write(), and display_open() when the device is no longer present. Guard access to usbdev_intf0 and usbdev_intf1 after disconnect so writers exit before USB cleanup.

Event History

Oct 15, 2025
CVE Published
via MITRE·07:58 AM
Data Sourced
via MITRE·07:58 AM
DescriptionSeverity
Data Sourced
via OSV·08:15 AM
DescriptionSeverityAffected Software
Data Sourced
via NVD·08:15 AM
DescriptionSeverity
Data Sourced
via Red Hat·09:01 AM
DescriptionSeverityAffected Software
Oct 16, 2025
Data Sourced
via Microsoft·01:02 AM
DescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2025-39993?

CVE-2025-39993 has a medium severity rating due to potential use-after-free vulnerabilities in the Linux kernel.

2

How do I fix CVE-2025-39993?

To fix CVE-2025-39993, you should apply the latest security updates provided by your Linux distribution.

3

What types of systems are affected by CVE-2025-39993?

CVE-2025-39993 affects Linux kernel systems that utilize media remote control drivers.

4

What is the impact of CVE-2025-39993?

The impact of CVE-2025-39993 includes the possibility of crashes or arbitrary code execution due to the use-after-free vulnerability.

5

Is there a workaround for CVE-2025-39993?

There are no specific workarounds for CVE-2025-39993, and the best practice is to apply the relevant kernel updates.

Company

Resources

Contact

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