UBUNTU-CVE-2025-39964: High severity ubuntu/linux vulnerability

Published Oct 13, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved: crypto: afalg - Disallow concurrent writes in afalgsendmsg Issuing two writes to the same afalg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.

Affected Software

224 affected componentsFixes available

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*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1150.156
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1195.210~14.04.1
Upgrade
Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.
Fixed in 4.4.0-276.310~14.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.4.0-276.310
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1188.203
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1187.200~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1195.210~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1180.197~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-245.257~16.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.4.0-1151.162
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1149.160~16.04.1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.4.0-1120.127
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-245.257
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1187.200
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1153.163~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1195.210
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.163~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1180.197
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.165~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-224.244~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1099.104~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1169.174
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1149.160
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1151.161~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1136.149~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2125.131
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2104.110
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1142.154
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2088.94
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-224.244
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1153.163
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.105~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.163
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1102.111~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1112.119
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.165
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.107~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-164.174~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1099.104
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1092.95~20.04.1
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
Upgrade
Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1057.60
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1140.149
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
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
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1151.161
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1095.101~20.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1136.149
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1093.97~20.04.2
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.4.0-1071.75
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1153.163+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1157.164+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1127.137
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.165+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-164.174
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.105
Upgrade
Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1044.46~22.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1102.111
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Fixed in 6.8.0-1044.50~22.04.1
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Fixed in 5.15.0-1102.111.1
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Fixed in 6.8.0-1046.53~22.04.1
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Fixed in 5.15.0-1098.107
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Fixed in 6.8.0-1045.48~22.04.1
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Fixed in 5.15.0-1094.100
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Fixed in 5.15.0-1081.89
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Fixed in 6.8.0-90.91~22.04.1
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Fixed in 5.15.0-1092.95
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Fixed in 6.8.0-1042.42~22.04.1
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Fixed in 5.15.0-1093.99
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Fixed in 5.15.0-1090.95
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Fixed in 5.15.0-164.174
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Fixed in 6.8.0-90.91.1~22.04.1
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Fixed in 5.15.0-1093.94
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Fixed in 6.8.0-1044.47~22.04.1
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Fixed in 5.15.0-1050.50
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Fixed in 5.15.0-1039.39
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Fixed in 5.15.0-1095.101
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Fixed in 6.8.0-1041.42~22.04.1
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Fixed in 5.15.0-1092.95
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Fixed in 6.8.0-90.91~22.04.1
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Fixed in 5.15.0-1062.66
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Fixed in 5.15.0-1082.84
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Fixed in 5.15.0-1090.92
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Fixed in 5.15.0-1097.106
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Fixed in 6.8.1-1039.40~22.04.1
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Fixed in 5.15.0-1098.105+fips1
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Fixed in 5.15.0-1102.111+fips1
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Fixed in 5.15.0-164.174+fips1
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Fixed in 5.15.0-1098.107+fips1
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Fixed in 6.8.0-90.91
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Fixed in 6.8.0-1044.46
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Fixed in 6.14.0-1018.18~24.04.1
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Fixed in 6.8.0-1044.50
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Fixed in 6.14.0-1017.17~24.04.1
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Fixed in 6.8.0-1046.53
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Fixed in 6.8.0-1029.32
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Fixed in 6.8.0-1045.48
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Fixed in 6.8.0-1041.46
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Fixed in 6.8.0-1028.31
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Fixed in 6.8.0-1042.42
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Fixed in 6.8.0-90.91.1
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Fixed in 6.8.0-1044.47
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Fixed in 6.8.0-1044.47.1
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Fixed in 6.8.0-1020.20
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Fixed in 6.14.0-1017.17
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Fixed in 6.8.0-1041.42
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Fixed in 6.8.0-1044.48
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Fixed in 6.14.0-37.37.1~24.04.1
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Fixed in 6.8.0-1021.22
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Fixed in 6.8.0-1014.18
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Fixed in 6.8.0-2035.36
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Fixed in 6.8.1-1039.40
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Fixed in 6.14.0-1017.17~24.04.1
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Fixed in 6.8.0-1044.46+fips1
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Fixed in 6.8.0-1044.50+fips1
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Fixed in 6.8.0-90.91+fips1
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Fixed in 6.8.0-1045.48+fips1
Configuration
Add and use a ctx->write field to disallow concurrent writes to the same af_alg socket.
Linux kernel crypto: af_alg ctx->write = exclusive ownership for writing

Event History

Oct 13, 2025

CVE Published

via OSV·02:15 PM

Data Sourced

via OSV·02:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Who can exploit this issue?

An attacker needs local access and low-level privileges on an affected Ubuntu system. The attack surface is AF_ALG sockets in the Linux kernel.

What condition is required to trigger the vulnerability?

The issue requires two concurrent write operations to the same AF_ALG socket. Those writes can interleave unpredictably and create inconsistent internal socket state.

What is the impact of successful exploitation?

The stated impact is denial of service, reflected by availability impact only. The provided vector does not indicate confidentiality or integrity impact.

Which Ubuntu kernel packages are in scope?

The affected software list includes ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, and their FIPS variants: ubuntu/linux-fips, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, and ubuntu/linux-gcp-fips.

UBUNTU-CVE-2025-39964: High severity ubuntu/linux vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

Who can exploit this issue?

What condition is required to trigger the vulnerability?

What is the impact of successful exploitation?

Which Ubuntu kernel packages are in scope?

Company

Resources

Contact

Frequently Asked Questions

Who can exploit this issue?

What condition is required to trigger the vulnerability?

What is the impact of successful exploitation?

Which Ubuntu kernel packages are in scope?