CVE-2025-39964: Linux Kernel Race Condition Vulnerability

Published Oct 13, 2025
·
Updated

crypto: afalg - Disallow concurrent writes in afalgsendmsg

Other sources

Linux Kernel contains a race condition vulnerability which allows concurrent writes to the same AFALG socket causing data to be unpredictably interleaved and creating inconsistencies in the socket's internal state.

— CISA

Affected Software

254 affected componentsFixes available
Linux Linux kernel
Microsoft azl3 kernel 6.6.96.2-2
Microsoft azl3 kernel 6.6.104.2-4
Patch available
Linux Kernel
Linux Linux kernel>=2.6.38<5.10.245
Linux Linux kernel>=5.11<5.15.194
Linux Linux kernel>=5.16<6.1.154
Linux Linux kernel>=6.2<6.6.108
Linux Linux kernel>=6.7<6.12.49
Linux Linux kernel>=6.13<6.16.9
Linux Linux kernel=6.17-rc1
Linux Linux kernel=6.17-rc2
Linux Linux kernel=6.17-rc3
Linux Linux kernel=6.17-rc4
Linux Linux kernel=6.17-rc5
Linux Linux kernel=6.17-rc6
All of the following
Siemens Simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware>=3.1.6
Siemens Simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp
All of the following
Siemens Simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp Firmware>=3.1.6
Siemens Simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp
debian/linux<6.1.158-1
6.1.158-1
debian/linux<6.12.57-1
6.12.57-1
debian/linux<6.16.9-1
6.16.9-1
ubuntu/linux*
ubuntu/linux-aws<4.4.0-1150.156
4.4.0-1150.156
ubuntu/linux-azure<4.15.0-1195.210~14.04.1
4.15.0-1195.210~14.04.1
ubuntu/linux-lts-xenial<4.4.0-276.310~14.04.1
4.4.0-276.310~14.04.1
ubuntu/linux<4.4.0-276.310
4.4.0-276.310
ubuntu/linux-aws<4.4.0-1188.203
4.4.0-1188.203
ubuntu/linux-aws-hwe<4.15.0-1187.200~16.04.1
4.15.0-1187.200~16.04.1
ubuntu/linux-azure<4.15.0-1195.210~16.04.1
4.15.0-1195.210~16.04.1
ubuntu/linux-gcp<4.15.0-1180.197~16.04.1
4.15.0-1180.197~16.04.1
ubuntu/linux-hwe<4.15.0-245.257~16.04.1
4.15.0-245.257~16.04.1
ubuntu/linux-kvm<4.4.0-1151.162
4.4.0-1151.162
ubuntu/linux-oracle<4.15.0-1149.160~16.04.1
4.15.0-1149.160~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1120.127
4.4.0-1120.127
ubuntu/linux-fips*
ubuntu/linux<4.15.0-245.257
4.15.0-245.257
ubuntu/linux-aws<4.15.0-1187.200
4.15.0-1187.200
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<4.15.0-1195.210
4.15.0-1195.210
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<4.15.0-1180.197
4.15.0-1180.197
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<4.15.0-1169.174
4.15.0-1169.174
ubuntu/linux-oem*
ubuntu/linux-oracle<4.15.0-1149.160
4.15.0-1149.160
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<4.15.0-2125.131
4.15.0-2125.131
ubuntu/linux-azure-fips<4.15.0-2104.110
4.15.0-2104.110
ubuntu/linux-fips<4.15.0-1142.154
4.15.0-1142.154
ubuntu/linux-gcp-fips<4.15.0-2088.94
4.15.0-2088.94
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-azure-fde*
ubuntu/linux-vmware*
linux/kernel>=2.6.38<5.10.245
5.10.245
linux/kernel>=5.11.0<5.15.194
5.15.194
linux/kernel>=5.16.0<6.1.154
6.1.154
linux/kernel>=6.2.0<6.6.108
6.6.108
linux/kernel>=6.7.0<6.12.49
6.12.49
linux/kernel>=6.13.0<6.16.9
6.16.9
debian/linux
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 6.1.158-1
  2. Upgrade

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

    Fixed in 6.12.57-1
  3. Upgrade

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

    Fixed in 6.16.9-1
  4. Upgrade

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

    Fixed in 4.4.0-1150.156
  5. Upgrade

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

    Fixed in 4.15.0-1195.210~14.04.1
  6. Upgrade

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

    Fixed in 4.4.0-276.310~14.04.1
  7. Upgrade

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

    Fixed in 4.4.0-276.310
  8. Upgrade

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

    Fixed in 4.4.0-1188.203
  9. Upgrade

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

    Fixed in 4.15.0-1187.200~16.04.1
  10. Upgrade

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

    Fixed in 4.15.0-1195.210~16.04.1
  11. Upgrade

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

    Fixed in 4.15.0-1180.197~16.04.1
  12. Upgrade

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

    Fixed in 4.15.0-245.257~16.04.1
  13. Upgrade

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

    Fixed in 4.4.0-1151.162
  14. Upgrade

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

    Fixed in 4.15.0-1149.160~16.04.1
  15. Upgrade

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

    Fixed in 4.4.0-1120.127
  16. Upgrade

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

    Fixed in 4.15.0-245.257
  17. Upgrade

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

    Fixed in 4.15.0-1187.200
  18. Upgrade

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

    Fixed in 5.4.0-1153.163~18.04.1
  19. Upgrade

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

    Fixed in 4.15.0-1195.210
  20. Upgrade

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

    Fixed in 5.4.0-1156.163~18.04.1
  21. Upgrade

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

    Fixed in 4.15.0-1180.197
  22. Upgrade

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

    Fixed in 5.4.0-1156.165~18.04.1
  23. Upgrade

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

    Fixed in 5.4.0-224.244~18.04.1
  24. Upgrade

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

    Fixed in 5.4.0-1099.104~18.04.1
  25. Upgrade

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

    Fixed in 4.15.0-1169.174
  26. Upgrade

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

    Fixed in 4.15.0-1149.160
  27. Upgrade

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

    Fixed in 5.4.0-1151.161~18.04.1
  28. Upgrade

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

    Fixed in 5.4.0-1136.149~18.04.1
  29. Upgrade

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

    Fixed in 4.15.0-2125.131
  30. Upgrade

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

    Fixed in 4.15.0-2104.110
  31. Upgrade

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

    Fixed in 4.15.0-1142.154
  32. Upgrade

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

    Fixed in 4.15.0-2088.94
  33. Upgrade

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

    Fixed in 5.4.0-224.244
  34. Upgrade

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

    Fixed in 5.4.0-1153.163
  35. Upgrade

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

    Fixed in 5.15.0-1098.105~20.04.1
  36. Upgrade

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

    Fixed in 5.4.0-1156.163
  37. Upgrade

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

    Fixed in 5.15.0-1102.111~20.04.1
  38. Upgrade

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

    Fixed in 5.4.0-1112.119
  39. Upgrade

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

    Fixed in 5.4.0-1156.165
  40. Upgrade

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

    Fixed in 5.15.0-1098.107~20.04.1
  41. Upgrade

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

    Fixed in 5.15.0-164.174~20.04.1
  42. Upgrade

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

    Fixed in 5.4.0-1099.104
  43. Upgrade

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

    Fixed in 5.15.0-1092.95~20.04.1
  44. 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
  45. Upgrade

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

    Fixed in 5.4.0-1057.60
  46. Upgrade

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

    Fixed in 5.4.0-1140.149
  47. 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
  48. 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
  49. Upgrade

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

    Fixed in 5.4.0-1151.161
  50. Upgrade

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

    Fixed in 5.15.0-1095.101~20.04.1
  51. Upgrade

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

    Fixed in 5.4.0-1136.149
  52. Upgrade

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

    Fixed in 5.15.0-1093.97~20.04.2
  53. Upgrade

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

    Fixed in 5.4.0-1071.75
  54. Upgrade

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

    Fixed in 5.4.0-1153.163+fips1
  55. Upgrade

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

    Fixed in 5.4.0-1157.164+fips1
  56. Upgrade

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

    Fixed in 5.4.0-1127.137
  57. Upgrade

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

    Fixed in 5.4.0-1156.165+fips1
  58. Upgrade

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

    Fixed in 5.15.0-164.174
  59. Upgrade

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

    Fixed in 5.15.0-1098.105
  60. Upgrade

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

    Fixed in 6.8.0-1044.46~22.04.1
  61. Upgrade

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

    Fixed in 5.15.0-1102.111
  62. Upgrade

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

    Fixed in 6.8.0-1044.50~22.04.1
  63. Upgrade

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

    Fixed in 5.15.0-1102.111.1
  64. 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
  65. Upgrade

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

    Fixed in 5.15.0-1098.107
  66. Upgrade

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

    Fixed in 6.8.0-1045.48~22.04.1
  67. Upgrade

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

    Fixed in 5.15.0-1094.100
  68. Upgrade

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

    Fixed in 5.15.0-1081.89
  69. Upgrade

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

    Fixed in 6.8.0-90.91~22.04.1
  70. Upgrade

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

    Fixed in 5.15.0-1092.95
  71. Upgrade

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

    Fixed in 6.8.0-1042.42~22.04.1
  72. Upgrade

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

    Fixed in 5.15.0-1093.99
  73. Upgrade

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

    Fixed in 5.15.0-1090.95
  74. Upgrade

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

    Fixed in 5.15.0-164.174
  75. 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
  76. Upgrade

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

    Fixed in 5.15.0-1093.94
  77. Upgrade

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

    Fixed in 6.8.0-1044.47~22.04.1
  78. Upgrade

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

    Fixed in 5.15.0-1050.50
  79. Upgrade

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

    Fixed in 5.15.0-1039.39
  80. Upgrade

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

    Fixed in 5.15.0-1095.101
  81. Upgrade

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

    Fixed in 6.8.0-1041.42~22.04.1
  82. Upgrade

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

    Fixed in 5.15.0-1092.95
  83. Upgrade

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

    Fixed in 6.8.0-90.91~22.04.1
  84. Upgrade

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

    Fixed in 5.15.0-1062.66
  85. Upgrade

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

    Fixed in 5.15.0-1082.84
  86. Upgrade

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

    Fixed in 5.15.0-1090.92
  87. Upgrade

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

    Fixed in 5.15.0-1097.106
  88. Upgrade

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

    Fixed in 6.8.1-1039.40~22.04.1
  89. Upgrade

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

    Fixed in 5.15.0-1098.105+fips1
  90. Upgrade

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

    Fixed in 5.15.0-1102.111+fips1
  91. Upgrade

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

    Fixed in 5.15.0-164.174+fips1
  92. Upgrade

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

    Fixed in 5.15.0-1098.107+fips1
  93. Upgrade

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

    Fixed in 6.8.0-90.91
  94. Upgrade

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

    Fixed in 6.8.0-1044.46
  95. Upgrade

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

    Fixed in 6.14.0-1018.18~24.04.1
  96. Upgrade

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

    Fixed in 6.8.0-1044.50
  97. Upgrade

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

    Fixed in 6.14.0-1017.17~24.04.1
  98. Upgrade

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

    Fixed in 6.8.0-1046.53
  99. Upgrade

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

    Fixed in 6.8.0-1029.32
  100. Upgrade

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

    Fixed in 6.8.0-1045.48
  101. Upgrade

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

    Fixed in 6.8.0-1041.46
  102. Upgrade

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

    Fixed in 6.8.0-1028.31
  103. Upgrade

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

    Fixed in 6.8.0-1042.42
  104. Upgrade

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

    Fixed in 6.8.0-90.91.1
  105. Upgrade

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

    Fixed in 6.8.0-1044.47
  106. Upgrade

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

    Fixed in 6.8.0-1044.47.1
  107. Upgrade

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

    Fixed in 6.8.0-1020.20
  108. Upgrade

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

    Fixed in 6.14.0-1017.17
  109. Upgrade

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

    Fixed in 6.8.0-1041.42
  110. Upgrade

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

    Fixed in 6.8.0-1044.48
  111. 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
  112. Upgrade

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

    Fixed in 6.8.0-1021.22
  113. Upgrade

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

    Fixed in 6.8.0-1014.18
  114. Upgrade

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

    Fixed in 6.8.0-2035.36
  115. Upgrade

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

    Fixed in 6.8.1-1039.40
  116. Upgrade

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

    Fixed in 6.14.0-1017.17~24.04.1
  117. Upgrade

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

    Fixed in 6.8.0-1044.46+fips1
  118. Upgrade

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

    Fixed in 6.8.0-1044.50+fips1
  119. Upgrade

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

    Fixed in 6.8.0-90.91+fips1
  120. Upgrade

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

    Fixed in 6.8.0-1045.48+fips1
  121. Upgrade

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

    Fixed in 5.10.245
  122. Upgrade

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

    Fixed in 5.15.194
  123. Upgrade

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

    Fixed in 6.1.154
  124. Upgrade

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

    Fixed in 6.6.108
  125. Upgrade

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

    Fixed in 6.12.49
  126. Upgrade

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

    Fixed in 6.16.9
  127. 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 7.3.4-1
  128. Configuration

    Add and enforce a ctx->write field in af_alg_sendmsg to disallow concurrent writes to the same AF_ALG socket.

    Linux kernel crypto: af_alg ctx->write = exclusive ownership for writing
  129. Compensating control

    Discontinue use of the product if the stated mitigation for concurrent AF_ALG socket writes is unavailable.

Event History

Oct 13, 2025
CVE Published
via MITRE·01:48 PM
Data Sourced
via MITRE·01:48 PM
DescriptionSeverity
Data Sourced
via OSV·01:48 PM
DescriptionSeverityAffected Software
Data Sourced
via Red Hat·02:01 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·02:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
Oct 15, 2025
Data Sourced
via Microsoft·01:01 AM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·01:01 AM
Affected Software
Nov 13, 2025
Exploit Published
via GitHub·01:07 PM
Sep 18, 2026
Data Sourced
via CISA·12:00 AM
RemedyDescriptionWeaknessAffected Software
Known Exploited
via CISA·12:00 AM

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-2025-39964?

CVE-2025-39964 has been classified with a medium severity rating due to its potential impact on data integrity.

2

How do I fix CVE-2025-39964?

To resolve CVE-2025-39964, ensure your Linux kernel is updated to the latest version where the vulnerability has been patched.

3

What systems are affected by CVE-2025-39964?

CVE-2025-39964 affects the Linux kernel, specifically systems utilizing the af_alg socket for crypto operations.

4

What are the risks of not addressing CVE-2025-39964?

Failing to address CVE-2025-39964 may lead to data corruption due to unpredictable interleaving of concurrent write operations.

5

When was CVE-2025-39964 reported?

CVE-2025-39964 was reported in 2025, highlighting a concern regarding concurrent write handling in the Linux kernel.

Company

Resources

Contact

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