UBUNTU-CVE-2025-40018: Use After Free

Q: What level of access is needed to exploit this issue?

The vector is local and requires low privileges; no user interaction is required. Exploitation is rated high complexity.

Q: Under what conditions can the use-after-free occur?

It can occur during network namespace cleanup if the IPVS FTP application is unregistered before connections holding valid cp->app pointers have been flushed.

Published Oct 24, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved: ipvs: Defer ipvsftp unregister during netns cleanup On the netns cleanup path, ipvsftpexit() may unregister ipvsftp before connections with valid cp->app pointers are flushed, leading to a use-after-free. Fix this by introducing a global exitingmodule flag, set to true in ipvsftpexit() before unregistering the pernet subsystem. In ipvsftpexit(), skip ipvsftp unregister if called during netns cleanup (when exitingmodule is false) and defer it to ipvscleanupbatch(), which unregisters all apps after all connections are flushed. If called during module exit, unregister ipvsftp immediately.

Affected Software

236 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-gcp-6.17<6.17.0-1008.8~24.04.1

6.17.0-1008.8~24.04.1

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-6.17<6.17.0-1008.8

6.17.0-1008.8

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-6.17<6.17.0-1008.8

6.17.0-1008.8

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-oracle-6.17<6.17.0-1007.7~24.04.1

6.17.0-1007.7~24.04.1

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<6.17.0-8.8

6.17.0-8.8

ubuntu/linux-aws<6.17.0-1005.5

6.17.0-1005.5

ubuntu/linux-azure<6.17.0-1006.6

6.17.0-1006.6

ubuntu/linux-azure-fde*

ubuntu/linux-gcp<6.17.0-1005.5

6.17.0-1005.5

ubuntu/linux-oracle<6.17.0-1005.5

6.17.0-1005.5

ubuntu/linux-raspi<6.17.0-1006.6

6.17.0-1006.6

ubuntu/linux-realtime<6.17.0-1004.5

6.17.0-1004.5

ubuntu/linux-riscv<6.17.0-8.8.1

6.17.0-8.8.1

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
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Fixed in 5.15.0-1050.50~20.04.1
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Fixed in 5.4.0-1151.161
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Fixed in 5.15.0-1095.101~20.04.1
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Fixed in 5.4.0-1136.149
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Fixed in 5.15.0-1093.97~20.04.2
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Fixed in 5.4.0-1071.75
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Fixed in 5.4.0-1153.163+fips1
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Fixed in 5.4.0-1157.164+fips1
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Fixed in 5.4.0-1127.137
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Fixed in 5.4.0-1156.165+fips1
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Fixed in 5.15.0-164.174
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Fixed in 5.15.0-1098.105
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Fixed in 6.8.0-1044.46~22.04.1
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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 6.17.0-1008.8~24.04.1
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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 6.17.0-1008.8
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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 6.17.0-1008.8
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Fixed in 6.8.0-1041.42
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Fixed in 6.17.0-1007.7~24.04.1
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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
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Fixed in 6.17.0-8.8
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Fixed in 6.17.0-1005.5
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Fixed in 6.17.0-1006.6
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Fixed in 6.17.0-1005.5
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Fixed in 6.17.0-1005.5
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Fixed in 6.17.0-1006.6
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Fixed in 6.17.0-1004.5
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Fixed in 6.17.0-8.8.1
Compensating control
Introduce a global `exiting_module` flag and set it to true in `ip_vs_ftp_exit()` before unregistering the pernet subsystem; immediately unregister `ip_vs_ftp` during module exit, but in `__ip_vs_ftp_exit()` skip unregistering it during netns cleanup when `exiting_module` is false and defer the unregister to `__ip_vs_cleanup_batch()` after all connections are flushed.

Event History

Oct 24, 2025

CVE Published

via OSV·12:15 PM

Data Sourced

via OSV·12:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

What level of access is needed to exploit this issue?

The vector is local and requires low privileges; no user interaction is required. Exploitation is rated high complexity.

Under what conditions can the use-after-free occur?

It can occur during network namespace cleanup if the IPVS FTP application is unregistered before connections holding valid cp->app pointers have been flushed.

Which Ubuntu kernel package families are listed as affected?

The listed packages are ubuntu/linux, ubuntu/linux-fips, ubuntu/linux-aws, ubuntu/linux-aws-fips, ubuntu/linux-azure, ubuntu/linux-azure-fips, ubuntu/linux-gcp, and ubuntu/linux-gcp-fips.

UBUNTU-CVE-2025-40018: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

What level of access is needed to exploit this issue?

Under what conditions can the use-after-free occur?

Which Ubuntu kernel package families are listed as affected?

Company

Resources

Contact

Frequently Asked Questions

What level of access is needed to exploit this issue?

Under what conditions can the use-after-free occur?

Which Ubuntu kernel package families are listed as affected?