CVE-2025-38350: (Pwn2Own) Red Hat Enterprise Linux CBS Packet Scheduling Use-After-Free Local Privilege Escalation Vulnerability

Published Jul 19, 2025
·
Updated

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

net/sched: Always pass notifications when child class becomes empty

Certain classful qdiscs may invoke their classes' dequeue handler on an enqueue operation. This may unexpectedly empty the child qdisc and thus make an in-flight class passive via qlennotify(). Most qdiscs do not expect such behaviour at this point in time and may re-activate the class eventually anyways which will lead to a use-after-free.

The referenced fix commit attempted to fix this behavior for the HFSC case by moving the backlog accounting around, though this turned out to be incomplete since the parent's parent may run into the issue too. The following reproducer demonstrates this use-after-free:

tc qdisc add dev lo root handle 1: drr tc filter add dev lo parent 1: basic classid 1:1 tc class add dev lo parent 1: classid 1:1 drr tc qdisc add dev lo parent 1:1 handle 2: hfsc def 1 tc class add dev lo parent 2: classid 2:1 hfsc rt m1 8 d 1 m2 0 tc qdisc add dev lo parent 2:1 handle 3: netem tc qdisc add dev lo parent 3:1 handle 4: blackhole

echo 1 | socat -u STDIN UDP4-DATAGRAM:127.0.0.1:8888 tc class delete dev lo classid 1:1 echo 1 | socat -u STDIN UDP4-DATAGRAM:127.0.0.1:8888

Since backlog accounting issues leading to a use-after-frees on stale class pointers is a recurring pattern at this point, this patch takes a different approach. Instead of trying to fix the accounting, the patch ensures that qdisctreereducebacklog always calls qlennotify when the child qdisc is empty. This solves the problem because deletion of qdiscs always involves a call to qdiscreset() and / or qdiscpurgequeue() which ultimately resets its qlen to 0 thus causing the following qdisctreereducebacklog() to report to the parent. Note that this may call qlennotify on passive classes multiple times. This is not a problem after the recent patch series that made all the classful qdiscs qlennotify() handlers idempotent.

Other sources

This vulnerability allows local attackers to escalate privileges on affected installations of Red Hat Enterprise Linux. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of hfscclass objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.

— ZDI

Affected Software

218 affected componentsFixes available
Linux Foundation Linux Kernel
Microsoft cbl2 kernel 5.15.186.1-1
Microsoft cbl2 kernel 5.15.186.1-1
Patch available
Linux Linux kernel>=5.4.294<5.4.296
Linux Linux kernel>=5.10.238<5.10.240
Linux Linux kernel>=5.15.185<5.15.187
Linux Linux kernel>=6.1.141<6.1.144
Linux Linux kernel>=6.6.93<6.6.97
Linux Linux kernel>=6.12.31<6.12.37
Linux Linux kernel>=6.14.9<6.15
Linux Linux kernel>=6.15.1<6.15.6
Linux Linux kernel=6.15
Linux Linux kernel=6.16-rc1
Linux Linux kernel=6.16-rc2
Linux Linux kernel=6.16-rc3
Linux Linux kernel=6.16-rc4
Debian Debian Linux=11.0
Red Hat Enterprise Linux
debian/linux
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.3-1
ubuntu/linux-azure<4.15.0-1192.207~14.04.1
4.15.0-1192.207~14.04.1
ubuntu/linux-aws-hwe<4.15.0-1184.197~16.04.1
4.15.0-1184.197~16.04.1
ubuntu/linux-azure<4.15.0-1192.207~16.04.1
4.15.0-1192.207~16.04.1
ubuntu/linux-gcp<4.15.0-1177.194~16.04.1
4.15.0-1177.194~16.04.1
ubuntu/linux-hwe<4.15.0-241.253~16.04.1
4.15.0-241.253~16.04.1
ubuntu/linux-oracle<4.15.0-1148.159~16.04.1
4.15.0-1148.159~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux<4.15.0-241.253
4.15.0-241.253
ubuntu/linux-aws<4.15.0-1184.197
4.15.0-1184.197
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-aws-5.4<5.4.0-1150.160~18.04.1
5.4.0-1150.160~18.04.1
ubuntu/linux-azure*
ubuntu/linux-azure-4.15<4.15.0-1192.207
4.15.0-1192.207
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-5.4<5.4.0-1154.161~18.04.1
5.4.0-1154.161~18.04.1
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-4.15<4.15.0-1177.194
4.15.0-1177.194
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-5.4<5.4.0-1153.162~18.04.1
5.4.0-1153.162~18.04.1
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-5.4<5.4.0-221.241~18.04.1
5.4.0-221.241~18.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-ibm-5.4<5.4.0-1096.101~18.04.1
5.4.0-1096.101~18.04.1
ubuntu/linux-kvm<4.15.0-1167.172
4.15.0-1167.172
ubuntu/linux-oem*
ubuntu/linux-oracle<4.15.0-1146.157
4.15.0-1146.157
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-oracle-5.4<5.4.0-1148.158~18.04.1
5.4.0-1148.158~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1133.146~18.04.1
5.4.0-1133.146~18.04.1
ubuntu/linux-aws-fips<4.15.0-2122.128
4.15.0-2122.128
ubuntu/linux-azure-fips<4.15.0-2101.107
4.15.0-2101.107
ubuntu/linux-fips<4.15.0-1139.150
4.15.0-1139.150
ubuntu/linux-gcp-fips<4.15.0-2085.91
4.15.0-2085.91
ubuntu/linux<5.4.0-221.241
5.4.0-221.241
ubuntu/linux-aws<5.4.0-1150.160
5.4.0-1150.160
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.15<5.15.0-1091.98~20.04.1
5.15.0-1091.98~20.04.1
ubuntu/linux-aws-5.8*
ubuntu/linux-azure<5.4.0-1154.161
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ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.15<5.15.0-1095.104~20.04.1
5.15.0-1095.104~20.04.1
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
ubuntu/linux-bluefield<5.4.0-1109.116
5.4.0-1109.116
ubuntu/linux-gcp<5.4.0-1153.162
5.4.0-1153.162
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.15<5.15.0-1091.100~20.04.1
5.15.0-1091.100~20.04.1
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<5.15.0-153.163~20.04.1
5.15.0-153.163~20.04.1
ubuntu/linux-hwe-5.8*
ubuntu/linux-ibm<5.4.0-1096.101
5.4.0-1096.101
ubuntu/linux-ibm-5.15<5.15.0-1085.88~20.04.1
5.15.0-1085.88~20.04.1
ubuntu/linux-intel-5.13*
ubuntu/linux-intel-iotg-5.15<5.15.0-1086.92~20.04.1
5.15.0-1086.92~20.04.1
ubuntu/linux-iot<5.4.0-1054.57
5.4.0-1054.57
ubuntu/linux-kvm<5.4.0-1137.146
5.4.0-1137.146
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-153.163~20.04.1
5.15.0-153.163~20.04.1
ubuntu/linux-nvidia-tegra-5.15<5.15.0-1044.44~20.04.1
5.15.0-1044.44~20.04.1
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle<5.4.0-1149.159
5.4.0-1149.159
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.15<5.15.0-1090.96~20.04.1
5.15.0-1090.96~20.04.1
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi<5.4.0-1133.146
5.4.0-1133.146
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.15<5.15.0-1086.90~20.04.1
5.15.0-1086.90~20.04.1
ubuntu/linux-riscv-5.8*
ubuntu/linux-xilinx-zynqmp<5.4.0-1068.72
5.4.0-1068.72
ubuntu/linux-aws-fips<5.4.0-1150.160+fips1
5.4.0-1150.160+fips1
ubuntu/linux-azure-fips<5.4.0-1155.162+fips1
5.4.0-1155.162+fips1
ubuntu/linux-fips<5.4.0-1124.134
5.4.0-1124.134
ubuntu/linux-gcp-fips<5.4.0-1153.162+fips1
5.4.0-1153.162+fips1
ubuntu/linux<5.15.0-153.163
5.15.0-153.163
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1091.98
5.15.0-1091.98
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-aws-6.8<6.8.0-1036.38~22.04.1
6.8.0-1036.38~22.04.1
ubuntu/linux-azure<5.15.0-1095.104
5.15.0-1095.104
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-6.8<6.8.0-1036.42~22.04.1
6.8.0-1036.42~22.04.1
ubuntu/linux-azure-fde<5.15.0-1095.104.1
5.15.0-1095.104.1
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp<5.15.0-1091.100
5.15.0-1091.100
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gcp-6.8<6.8.0-1037.39~22.04.1
6.8.0-1037.39~22.04.1
ubuntu/linux-gke<5.15.0-1088.94
5.15.0-1088.94
ubuntu/linux-gkeop<5.15.0-1074.82
5.15.0-1074.82
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-hwe-6.8<6.8.0-79.79~22.04.1
6.8.0-79.79~22.04.1
ubuntu/linux-ibm<5.15.0-1085.88
5.15.0-1085.88
ubuntu/linux-ibm-6.8<6.8.0-1036.36~22.04.1
6.8.0-1036.36~22.04.1
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg<5.15.0-1086.92
5.15.0-1086.92
ubuntu/linux-kvm<5.15.0-1087.92
5.15.0-1087.92
ubuntu/linux-lowlatency<5.15.0-153.163
5.15.0-153.163
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-lowlatency-hwe-6.8<6.8.0-79.79.1~22.04.1
6.8.0-79.79.1~22.04.1
ubuntu/linux-nvidia<5.15.0-1086.87
5.15.0-1086.87
ubuntu/linux-nvidia-6.2*
ubuntu/linux-nvidia-6.5*
ubuntu/linux-nvidia-6.8<6.8.0-1036.39~22.04.1
6.8.0-1036.39~22.04.1
ubuntu/linux-nvidia-tegra<5.15.0-1044.44
5.15.0-1044.44
ubuntu/linux-nvidia-tegra-igx<5.15.0-1033.33
5.15.0-1033.33
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-oem-6.5*
ubuntu/linux-oracle<5.15.0-1089.95
5.15.0-1089.95
ubuntu/linux-oracle-6.5*
ubuntu/linux-oracle-6.8<6.8.0-1033.34~22.04.1
6.8.0-1033.34~22.04.1
ubuntu/linux-raspi<5.15.0-1085.88
5.15.0-1085.88
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-riscv-6.5*
ubuntu/linux-riscv-6.8<6.8.0-79.79~22.04.1
6.8.0-79.79~22.04.1
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-starfive-6.5*
ubuntu/linux-xilinx-zynqmp<5.15.0-1055.59
5.15.0-1055.59
ubuntu/linux-bluefield<5.15.0-1075.77
5.15.0-1075.77
ubuntu/linux-intel-iot-realtime<5.15.0-1084.86
5.15.0-1084.86
ubuntu/linux-realtime<5.15.0-1091.100
5.15.0-1091.100
ubuntu/linux-realtime-6.8<6.8.1-1031.32~22.04.1
6.8.1-1031.32~22.04.1
ubuntu/linux-aws-fips<5.15.0-1091.98+fips1
5.15.0-1091.98+fips1
ubuntu/linux-azure-fips<5.15.0-1095.104+fips1
5.15.0-1095.104+fips1
ubuntu/linux-fips<5.15.0-153.163+fips1
5.15.0-153.163+fips1
ubuntu/linux-gcp-fips<5.15.0-1091.100+fips1
5.15.0-1091.100+fips1
ubuntu/linux<6.8.0-79.79
6.8.0-79.79
ubuntu/linux-aws<6.8.0-1036.38
6.8.0-1036.38
ubuntu/linux-aws-6.14<6.14.0-1012.12~24.04.1
6.14.0-1012.12~24.04.1
ubuntu/linux-azure<6.8.0-1038.44
6.8.0-1038.44
ubuntu/linux-azure-6.11*
ubuntu/linux-azure-nvidia<6.8.0-1025.27
6.8.0-1025.27
ubuntu/linux-azure-nvidia-6.14<6.14.0-1007.7
6.14.0-1007.7
ubuntu/linux-gcp<6.8.0-1037.39
6.8.0-1037.39
ubuntu/linux-gcp-6.11*
ubuntu/linux-gcp-6.14<6.14.0-1015.16~24.04.1
6.14.0-1015.16~24.04.1
ubuntu/linux-gke<6.8.0-1033.37
6.8.0-1033.37
ubuntu/linux-gkeop<6.8.0-1020.22
6.8.0-1020.22
ubuntu/linux-hwe-6.11*
ubuntu/linux-ibm<6.8.0-1036.36
6.8.0-1036.36
ubuntu/linux-intel*
ubuntu/linux-lowlatency<6.8.0-79.79.1
6.8.0-79.79.1
ubuntu/linux-lowlatency-hwe-6.11*
ubuntu/linux-nvidia<6.8.0-1036.39
6.8.0-1036.39
ubuntu/linux-nvidia-6.11*
ubuntu/linux-nvidia-lowlatency<6.8.0-1036.39.1
6.8.0-1036.39.1
ubuntu/linux-nvidia-tegra<6.8.0-1010.10
6.8.0-1010.10
ubuntu/linux-oem-6.11*
ubuntu/linux-oem-6.14<6.14.0-1011.11
6.14.0-1011.11
ubuntu/linux-oem-6.8*
ubuntu/linux-oracle<6.8.0-1033.34
6.8.0-1033.34
ubuntu/linux-oracle-6.14<6.14.0-1012.12~24.04.1
6.14.0-1012.12~24.04.1
ubuntu/linux-raspi<6.8.0-1036.40
6.8.0-1036.40
ubuntu/linux-raspi-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-6.14<6.14.0-29.29.1~24.04.1
6.14.0-29.29.1~24.04.1
ubuntu/linux-xilinx<6.8.0-1018.19
6.8.0-1018.19
ubuntu/linux-raspi-realtime<6.8.0-2029.30
6.8.0-2029.30
ubuntu/linux-realtime<6.8.1-1031.32
6.8.1-1031.32
ubuntu/linux-realtime-6.14<6.14.0-1011.11~24.04.1
6.14.0-1011.11~24.04.1
ubuntu/linux-aws-fips<6.8.0-1036.38+fips1
6.8.0-1036.38+fips1
ubuntu/linux-azure-fips<6.8.0-1040.46+fips1
6.8.0-1040.46+fips1
ubuntu/linux-fips<6.8.0-79.79+fips1
6.8.0-79.79+fips1
ubuntu/linux-gcp-fips<6.8.0-1037.39+fips1
6.8.0-1037.39+fips1
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. 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 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.3-1
  2. Upgrade

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

    Fixed in 4.15.0-1192.207~14.04.1
  3. Upgrade

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

    Fixed in 4.15.0-1184.197~16.04.1
  4. Upgrade

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

    Fixed in 4.15.0-1192.207~16.04.1
  5. Upgrade

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

    Fixed in 4.15.0-1177.194~16.04.1
  6. Upgrade

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

    Fixed in 4.15.0-241.253~16.04.1
  7. Upgrade

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

    Fixed in 4.15.0-1148.159~16.04.1
  8. Upgrade

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

    Fixed in 4.15.0-241.253
  9. Upgrade

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

    Fixed in 4.15.0-1184.197
  10. Upgrade

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

    Fixed in 5.4.0-1150.160~18.04.1
  11. Upgrade

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

    Fixed in 4.15.0-1192.207
  12. Upgrade

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

    Fixed in 5.4.0-1154.161~18.04.1
  13. Upgrade

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

    Fixed in 4.15.0-1177.194
  14. Upgrade

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

    Fixed in 5.4.0-1153.162~18.04.1
  15. Upgrade

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

    Fixed in 5.4.0-221.241~18.04.1
  16. Upgrade

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

    Fixed in 5.4.0-1096.101~18.04.1
  17. Upgrade

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

    Fixed in 4.15.0-1167.172
  18. Upgrade

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

    Fixed in 4.15.0-1146.157
  19. Upgrade

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

    Fixed in 5.4.0-1148.158~18.04.1
  20. Upgrade

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

    Fixed in 5.4.0-1133.146~18.04.1
  21. Upgrade

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

    Fixed in 4.15.0-2122.128
  22. Upgrade

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

    Fixed in 4.15.0-2101.107
  23. Upgrade

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

    Fixed in 4.15.0-1139.150
  24. Upgrade

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

    Fixed in 4.15.0-2085.91
  25. Upgrade

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

    Fixed in 5.4.0-221.241
  26. Upgrade

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

    Fixed in 5.4.0-1150.160
  27. Upgrade

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

    Fixed in 5.15.0-1091.98~20.04.1
  28. Upgrade

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

    Fixed in 5.4.0-1154.161
  29. Upgrade

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

    Fixed in 5.15.0-1095.104~20.04.1
  30. Upgrade

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

    Fixed in 5.4.0-1109.116
  31. Upgrade

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

    Fixed in 5.4.0-1153.162
  32. Upgrade

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

    Fixed in 5.15.0-1091.100~20.04.1
  33. Upgrade

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

    Fixed in 5.15.0-153.163~20.04.1
  34. Upgrade

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

    Fixed in 5.4.0-1096.101
  35. Upgrade

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

    Fixed in 5.15.0-1085.88~20.04.1
  36. Upgrade

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

    Fixed in 5.15.0-1086.92~20.04.1
  37. Upgrade

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

    Fixed in 5.4.0-1054.57
  38. Upgrade

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

    Fixed in 5.4.0-1137.146
  39. Upgrade

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

    Fixed in 5.15.0-153.163~20.04.1
  40. Upgrade

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

    Fixed in 5.15.0-1044.44~20.04.1
  41. Upgrade

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

    Fixed in 5.4.0-1149.159
  42. Upgrade

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

    Fixed in 5.15.0-1090.96~20.04.1
  43. Upgrade

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

    Fixed in 5.4.0-1133.146
  44. Upgrade

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

    Fixed in 5.15.0-1086.90~20.04.1
  45. Upgrade

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

    Fixed in 5.4.0-1068.72
  46. Upgrade

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

    Fixed in 5.4.0-1150.160+fips1
  47. Upgrade

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

    Fixed in 5.4.0-1155.162+fips1
  48. Upgrade

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

    Fixed in 5.4.0-1124.134
  49. Upgrade

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

    Fixed in 5.4.0-1153.162+fips1
  50. Upgrade

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

    Fixed in 5.15.0-153.163
  51. Upgrade

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

    Fixed in 5.15.0-1091.98
  52. Upgrade

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

    Fixed in 6.8.0-1036.38~22.04.1
  53. Upgrade

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

    Fixed in 5.15.0-1095.104
  54. Upgrade

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

    Fixed in 6.8.0-1036.42~22.04.1
  55. Upgrade

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

    Fixed in 5.15.0-1095.104.1
  56. Upgrade

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

    Fixed in 5.15.0-1091.100
  57. Upgrade

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

    Fixed in 6.8.0-1037.39~22.04.1
  58. Upgrade

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

    Fixed in 5.15.0-1088.94
  59. Upgrade

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

    Fixed in 5.15.0-1074.82
  60. Upgrade

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

    Fixed in 6.8.0-79.79~22.04.1
  61. Upgrade

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

    Fixed in 5.15.0-1085.88
  62. Upgrade

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

    Fixed in 6.8.0-1036.36~22.04.1
  63. Upgrade

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

    Fixed in 5.15.0-1086.92
  64. Upgrade

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

    Fixed in 5.15.0-1087.92
  65. Upgrade

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

    Fixed in 5.15.0-153.163
  66. Upgrade

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

    Fixed in 6.8.0-79.79.1~22.04.1
  67. Upgrade

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

    Fixed in 5.15.0-1086.87
  68. Upgrade

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

    Fixed in 6.8.0-1036.39~22.04.1
  69. Upgrade

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

    Fixed in 5.15.0-1044.44
  70. Upgrade

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

    Fixed in 5.15.0-1033.33
  71. Upgrade

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

    Fixed in 5.15.0-1089.95
  72. Upgrade

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

    Fixed in 6.8.0-1033.34~22.04.1
  73. Upgrade

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

    Fixed in 5.15.0-1085.88
  74. Upgrade

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

    Fixed in 6.8.0-79.79~22.04.1
  75. Upgrade

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

    Fixed in 5.15.0-1055.59
  76. Upgrade

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

    Fixed in 5.15.0-1075.77
  77. Upgrade

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

    Fixed in 5.15.0-1084.86
  78. Upgrade

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

    Fixed in 5.15.0-1091.100
  79. Upgrade

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

    Fixed in 6.8.1-1031.32~22.04.1
  80. Upgrade

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

    Fixed in 5.15.0-1091.98+fips1
  81. Upgrade

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

    Fixed in 5.15.0-1095.104+fips1
  82. Upgrade

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

    Fixed in 5.15.0-153.163+fips1
  83. Upgrade

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

    Fixed in 5.15.0-1091.100+fips1
  84. Upgrade

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

    Fixed in 6.8.0-79.79
  85. Upgrade

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

    Fixed in 6.8.0-1036.38
  86. Upgrade

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

    Fixed in 6.14.0-1012.12~24.04.1
  87. Upgrade

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

    Fixed in 6.8.0-1038.44
  88. Upgrade

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

    Fixed in 6.8.0-1025.27
  89. Upgrade

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

    Fixed in 6.14.0-1007.7
  90. Upgrade

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

    Fixed in 6.8.0-1037.39
  91. Upgrade

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

    Fixed in 6.14.0-1015.16~24.04.1
  92. Upgrade

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

    Fixed in 6.8.0-1033.37
  93. Upgrade

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

    Fixed in 6.8.0-1020.22
  94. Upgrade

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

    Fixed in 6.8.0-1036.36
  95. Upgrade

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

    Fixed in 6.8.0-79.79.1
  96. Upgrade

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

    Fixed in 6.8.0-1036.39
  97. Upgrade

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

    Fixed in 6.8.0-1036.39.1
  98. Upgrade

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

    Fixed in 6.8.0-1010.10
  99. Upgrade

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

    Fixed in 6.14.0-1011.11
  100. Upgrade

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

    Fixed in 6.8.0-1033.34
  101. Upgrade

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

    Fixed in 6.14.0-1012.12~24.04.1
  102. Upgrade

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

    Fixed in 6.8.0-1036.40
  103. Upgrade

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

    Fixed in 6.14.0-29.29.1~24.04.1
  104. Upgrade

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

    Fixed in 6.8.0-1018.19
  105. Upgrade

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

    Fixed in 6.8.0-2029.30
  106. Upgrade

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

    Fixed in 6.8.1-1031.32
  107. Upgrade

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

    Fixed in 6.14.0-1011.11~24.04.1
  108. Upgrade

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

    Fixed in 6.8.0-1036.38+fips1
  109. Upgrade

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

    Fixed in 6.8.0-1040.46+fips1
  110. Upgrade

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

    Fixed in 6.8.0-79.79+fips1
  111. Upgrade

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

    Fixed in 6.8.0-1037.39+fips1

Event History

Jul 19, 2025
CVE Published
via MITRE·06:46 AM
Data Sourced
via MITRE·06:46 AM
DescriptionSeverity
Data Sourced
via Red Hat·07:01 AM
DescriptionSeverityAffected Software
Data Sourced
via OSV·07:15 AM
DescriptionSeverityAffected Software
Event
via OSV·07:15 AM
Data Sourced
via NVD·07:15 AM
RemedyDescriptionSeverityWeaknessAffected Software
Jul 24, 2025
Advisory Published
via ZDI·12:00 AM
Data Sourced
via ZDI·12:00 AM
DescriptionSeverityAffected Software
Dec 18, 2025
Data Sourced
via Microsoft·01:01 AM
DescriptionSeverityWeaknessAffected Software

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-2025-38350?

CVE-2025-38350 has a severity rating that indicates it may lead to unexpected behaviors in classful queuing disciplines.

2

How do I fix CVE-2025-38350?

To fix CVE-2025-38350, update the Linux kernel to the latest stable version that addresses this vulnerability.

3

What impact does CVE-2025-38350 have on the Linux kernel?

CVE-2025-38350 may cause issues with classful qdiscs potentially leading to performance problems in network traffic scheduling.

4

Is CVE-2025-38350 exploitable remotely?

The exploitability of CVE-2025-38350 typically depends on the specific configuration and deployment of the Linux kernel.

5

Which versions of the Linux kernel are affected by CVE-2025-38350?

CVE-2025-38350 affects specific versions of the Linux kernel that utilize classful queuing disciplines.

Company

Resources

Contact

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