UBUNTU-CVE-2025-38618: Use After Free

Q: Which Ubuntu systems are in scope?

The affected software list includes Ubuntu Linux kernels and the AWS, Azure, GCP, and FIPS kernel variants: linux, linux-aws, linux-azure, linux-gcp, linux-fips, linux-aws-fips, linux-azure-fips, and linux-gcp-fips.

Q: What access does an attacker need to exploit this issue?

The provided severity vector indicates local attack access and low privileges are required. No user interaction is required.

Q: What conditions trigger the use-after-free?

A vsock must autobind to VMADDR_PORT_ANY and then receive a connection. The socket returned by accept() retains VMADDR_PORT_ANY; attempting to bind that accepted socket causes an extra reference-count decrement and can result in a use-after-free.

Q: What is the remediation described by the fix?

The fix changes __vsock_bind_connectible() to reject binding to VMADDR_PORT_ANY, preventing the invalid binding and extra reference-count decrement.

Published Aug 22, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved: vsock: Do not allow binding to VMADDRPORTANY It is possible for a vsock to autobind to VMADDRPORTANY. This can cause a use-after-free when a connection is made to the bound socket. The socket returned by accept() also has port VMADDRPORTANY but is not on the list of unbound sockets. Binding it will result in an extra refcount decrement similar to the one fixed in fcdd2242c023 (vsock: Keep the binding until socket destruction). Modify the check in vsockbindconnectible() to also prevent binding to VMADDRPORTANY.

Affected Software

222 affected componentsFixes available

ubuntu/linux*

ubuntu/linux-aws<4.4.0-1148.154

4.4.0-1148.154

ubuntu/linux-azure<4.15.0-1193.208~14.04.1

4.15.0-1193.208~14.04.1

ubuntu/linux-lts-xenial<4.4.0-273.307~14.04.1

4.4.0-273.307~14.04.1

ubuntu/linux<4.4.0-273.307

4.4.0-273.307

ubuntu/linux-aws<4.4.0-1186.201

4.4.0-1186.201

ubuntu/linux-aws-hwe<4.15.0-1185.198~16.04.1

4.15.0-1185.198~16.04.1

ubuntu/linux-azure<4.15.0-1193.208~16.04.1

4.15.0-1193.208~16.04.1

ubuntu/linux-gcp<4.15.0-1178.195~16.04.1

4.15.0-1178.195~16.04.1

ubuntu/linux-hwe<4.15.0-242.254~16.04.1

4.15.0-242.254~16.04.1

ubuntu/linux-kvm<4.4.0-1149.160

4.4.0-1149.160

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-fips<4.4.0-1119.126

4.4.0-1119.126

ubuntu/linux-fips*

ubuntu/linux<4.15.0-242.254

4.15.0-242.254

ubuntu/linux-aws<4.15.0-1185.198

4.15.0-1185.198

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1151.161~18.04.1

5.4.0-1151.161~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15<4.15.0-1193.208

4.15.0-1193.208

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<4.15.0-1178.195

4.15.0-1178.195

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1154.163~18.04.1

5.4.0-1154.163~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-222.242~18.04.1

5.4.0-222.242~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1097.102~18.04.1

5.4.0-1097.102~18.04.1

ubuntu/linux-kvm<4.15.0-1168.173

4.15.0-1168.173

ubuntu/linux-oem*

ubuntu/linux-oracle<4.15.0-1147.158

4.15.0-1147.158

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1149.159~18.04.1

5.4.0-1149.159~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1134.147~18.04.1

5.4.0-1134.147~18.04.1

ubuntu/linux-aws-fips<4.15.0-2123.129

4.15.0-2123.129

ubuntu/linux-azure-fips<4.15.0-2102.108

4.15.0-2102.108

ubuntu/linux-fips<4.15.0-1140.151

4.15.0-1140.151

ubuntu/linux-gcp-fips<4.15.0-2086.92

4.15.0-2086.92

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-222.242

5.4.0-222.242

ubuntu/linux-aws<5.4.0-1151.161

5.4.0-1151.161

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1093.100~20.04.1

5.15.0-1093.100~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure<5.4.0-1154.161

5.4.0-1154.161

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1097.106~20.04.1

5.15.0-1097.106~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-bluefield<5.4.0-1110.117

5.4.0-1110.117

ubuntu/linux-gcp<5.4.0-1154.163

5.4.0-1154.163

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1093.102~20.04.1

5.15.0-1093.102~20.04.1

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<5.15.0-157.167~20.04.1

5.15.0-157.167~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm<5.4.0-1097.102

5.4.0-1097.102

ubuntu/linux-ibm-5.15<5.15.0-1087.90~20.04.1

5.15.0-1087.90~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1088.94~20.04.1

5.15.0-1088.94~20.04.1

ubuntu/linux-iot<5.4.0-1055.58

5.4.0-1055.58

ubuntu/linux-kvm<5.4.0-1138.147

5.4.0-1138.147

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-157.167~20.04.1

5.15.0-157.167~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1046.46~20.04.1

5.15.0-1046.46~20.04.1

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<5.15.0-1091.97~20.04.1

5.15.0-1091.97~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi<5.4.0-1134.147

5.4.0-1134.147

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1088.92~20.04.1

5.15.0-1088.92~20.04.1

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp<5.4.0-1069.73

5.4.0-1069.73

ubuntu/linux-aws-fips<5.4.0-1151.161+fips1

5.4.0-1151.161+fips1

ubuntu/linux-azure-fips<5.4.0-1155.162+fips1

5.4.0-1155.162+fips1

ubuntu/linux-fips<5.4.0-1125.135

5.4.0-1125.135

ubuntu/linux-gcp-fips<5.4.0-1154.163+fips1

5.4.0-1154.163+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-157.167

5.15.0-157.167

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1093.100

5.15.0-1093.100

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1040.42~22.04.1

6.8.0-1040.42~22.04.1

ubuntu/linux-azure<5.15.0-1097.106

5.15.0-1097.106

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1040.46~22.04.1

6.8.0-1040.46~22.04.1

ubuntu/linux-azure-fde<5.15.0-1098.107.1

5.15.0-1098.107.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1093.102

5.15.0-1093.102

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1041.43~22.04.1

6.8.0-1041.43~22.04.1

ubuntu/linux-gke<5.15.0-1090.96

5.15.0-1090.96

ubuntu/linux-gkeop<5.15.0-1076.84

5.15.0-1076.84

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-85.85~22.04.1

6.8.0-85.85~22.04.1

ubuntu/linux-ibm<5.15.0-1087.90

5.15.0-1087.90

ubuntu/linux-ibm-6.8<6.8.0-1038.38~22.04.1

6.8.0-1038.38~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1088.94

5.15.0-1088.94

ubuntu/linux-kvm<5.15.0-1089.94

5.15.0-1089.94

ubuntu/linux-lowlatency<5.15.0-157.167

5.15.0-157.167

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-85.85.1~22.04.1

6.8.0-85.85.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1088.89

5.15.0-1088.89

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1040.43~22.04.1

6.8.0-1040.43~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1046.46

5.15.0-1046.46

ubuntu/linux-nvidia-tegra-igx<5.15.0-1035.35

5.15.0-1035.35

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1091.97

5.15.0-1091.97

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1037.38~22.04.1

6.8.0-1037.38~22.04.1

ubuntu/linux-raspi<5.15.0-1087.90

5.15.0-1087.90

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-86.87~22.04.1

6.8.0-86.87~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1057.61

5.15.0-1057.61

ubuntu/linux-bluefield<5.15.0-1077.79

5.15.0-1077.79

ubuntu/linux-intel-iot-realtime<5.15.0-1086.88

5.15.0-1086.88

ubuntu/linux-realtime<5.15.0-1093.102

5.15.0-1093.102

ubuntu/linux-realtime-6.8<6.8.1-1035.36~22.04.1

6.8.1-1035.36~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1093.100+fips1

5.15.0-1093.100+fips1

ubuntu/linux-azure-fips<5.15.0-1097.106+fips1

5.15.0-1097.106+fips1

ubuntu/linux-fips<5.15.0-157.167+fips1

5.15.0-157.167+fips1

ubuntu/linux-gcp-fips<5.15.0-1093.102+fips1

5.15.0-1093.102+fips1

ubuntu/linux<6.8.0-85.85

6.8.0-85.85

ubuntu/linux-aws<6.8.0-1040.42

6.8.0-1040.42

ubuntu/linux-aws-6.14<6.14.0-1014.14~24.04.1

6.14.0-1014.14~24.04.1

ubuntu/linux-azure<6.8.0-1040.46

6.8.0-1040.46

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14<6.14.0-1013.13~24.04.1

6.14.0-1013.13~24.04.1

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<6.8.0-1041.43

6.8.0-1041.43

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14<6.14.0-1017.18~24.04.1

6.14.0-1017.18~24.04.1

ubuntu/linux-gke<6.8.0-1037.41

6.8.0-1037.41

ubuntu/linux-gkeop<6.8.0-1024.26

6.8.0-1024.26

ubuntu/linux-hwe-6.11*

ubuntu/linux-ibm<6.8.0-1038.38

6.8.0-1038.38

ubuntu/linux-intel*

ubuntu/linux-lowlatency<6.8.0-85.85.1

6.8.0-85.85.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1040.43

6.8.0-1040.43

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-lowlatency<6.8.0-1040.43.1

6.8.0-1040.43.1

ubuntu/linux-nvidia-tegra<6.8.0-1012.12

6.8.0-1012.12

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14<6.14.0-1013.13

6.14.0-1013.13

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1037.38

6.8.0-1037.38

ubuntu/linux-oracle-6.14<6.14.0-1014.14~24.04.1

6.14.0-1014.14~24.04.1

ubuntu/linux-raspi<6.8.0-1040.44

6.8.0-1040.44

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14<6.14.0-33.33.1~24.04.1

6.14.0-33.33.1~24.04.1

ubuntu/linux-xilinx<6.8.0-1018.19

6.8.0-1018.19

ubuntu/linux-bluefield<6.8.0-1012.16

6.8.0-1012.16

ubuntu/linux-raspi-realtime<6.8.0-2031.32

6.8.0-2031.32

ubuntu/linux-realtime<6.8.1-1035.36

6.8.1-1035.36

ubuntu/linux-realtime-6.14<6.14.0-1013.13~24.04.1

6.14.0-1013.13~24.04.1

ubuntu/linux-aws-fips<6.8.0-1040.42+fips1

6.8.0-1040.42+fips1

ubuntu/linux-azure-fips<6.8.0-1040.46+fips1

6.8.0-1040.46+fips1

ubuntu/linux-fips<6.8.0-85.85+fips1

6.8.0-85.85+fips1

ubuntu/linux-gcp-fips<6.8.0-1041.43+fips1

6.8.0-1041.43+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 4.4.0-1148.154
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1193.208~14.04.1
Upgrade
Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.
Fixed in 4.4.0-273.307~14.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.4.0-273.307
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1186.201
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1185.198~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1193.208~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1178.195~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-242.254~16.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.4.0-1149.160
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1148.159~16.04.1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.4.0-1119.126
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-242.254
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1185.198
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1151.161~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1193.208
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1154.161~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1178.195
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1154.163~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-222.242~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1097.102~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1168.173
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1147.158
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1149.159~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1134.147~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2123.129
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2102.108
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1140.151
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2086.92
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-222.242
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1151.161
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1093.100~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1154.161
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1097.106~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1110.117
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1154.163
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1093.102~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-157.167~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1097.102
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1087.90~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1088.94~20.04.1
Upgrade
Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1055.58
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1138.147
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-157.167~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1046.46~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1149.159
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1091.97~20.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1134.147
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1088.92~20.04.1
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.4.0-1069.73
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Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1151.161+fips1
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Fixed in 5.4.0-1155.162+fips1
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Fixed in 5.4.0-1125.135
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Fixed in 5.4.0-1154.163+fips1
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Fixed in 5.15.0-157.167
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Fixed in 5.15.0-1093.100
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Fixed in 6.8.0-1040.42~22.04.1
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Fixed in 5.15.0-1097.106
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Fixed in 6.8.0-1040.46~22.04.1
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Fixed in 5.15.0-1098.107.1
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Fixed in 5.15.0-1093.102
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Fixed in 6.8.0-1041.43~22.04.1
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Fixed in 5.15.0-1090.96
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Fixed in 5.15.0-1076.84
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Fixed in 6.8.0-85.85~22.04.1
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Fixed in 5.15.0-1087.90
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Fixed in 6.8.0-1038.38~22.04.1
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Fixed in 5.15.0-1088.94
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Fixed in 5.15.0-1089.94
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Fixed in 5.15.0-157.167
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Fixed in 6.8.0-85.85.1~22.04.1
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Fixed in 5.15.0-1088.89
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Fixed in 6.8.0-1040.43~22.04.1
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Fixed in 5.15.0-1046.46
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Fixed in 5.15.0-1035.35
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Fixed in 5.15.0-1091.97
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Fixed in 6.8.0-1037.38~22.04.1
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Fixed in 5.15.0-1087.90
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Fixed in 6.8.0-86.87~22.04.1
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Fixed in 5.15.0-1057.61
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Fixed in 5.15.0-1077.79
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Fixed in 5.15.0-1086.88
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Fixed in 5.15.0-1093.102
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Fixed in 6.8.1-1035.36~22.04.1
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Fixed in 5.15.0-1093.100+fips1
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Fixed in 5.15.0-1097.106+fips1
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Fixed in 5.15.0-157.167+fips1
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Fixed in 5.15.0-1093.102+fips1
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Fixed in 6.8.0-85.85
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Fixed in 6.8.0-1040.42
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Fixed in 6.14.0-1014.14~24.04.1
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Fixed in 6.8.0-1040.46
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Fixed in 6.14.0-1013.13~24.04.1
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Fixed in 6.8.0-1025.27
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Fixed in 6.14.0-1007.7
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Fixed in 6.8.0-1041.43
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Fixed in 6.14.0-1017.18~24.04.1
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Fixed in 6.8.0-1037.41
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Fixed in 6.8.0-1024.26
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Fixed in 6.8.0-1038.38
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Fixed in 6.8.0-85.85.1
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Fixed in 6.8.0-1040.43
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Fixed in 6.8.0-1040.43.1
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Fixed in 6.8.0-1012.12
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Fixed in 6.14.0-1013.13
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Fixed in 6.8.0-1037.38
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Fixed in 6.14.0-1014.14~24.04.1
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Fixed in 6.8.0-1040.44
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Fixed in 6.14.0-33.33.1~24.04.1
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Fixed in 6.8.0-1018.19
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Fixed in 6.8.0-1012.16
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Fixed in 6.8.0-2031.32
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Fixed in 6.8.1-1035.36
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Fixed in 6.14.0-1013.13~24.04.1
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Fixed in 6.8.0-1040.42+fips1
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Fixed in 6.8.0-1040.46+fips1
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Fixed in 6.8.0-85.85+fips1
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Fixed in 6.8.0-1041.43+fips1

Event History

Aug 22, 2025

CVE Published

via OSV·02:15 PM

Data Sourced

via OSV·02:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which Ubuntu systems are in scope?

The affected software list includes Ubuntu Linux kernels and the AWS, Azure, GCP, and FIPS kernel variants: linux, linux-aws, linux-azure, linux-gcp, linux-fips, linux-aws-fips, linux-azure-fips, and linux-gcp-fips.

What access does an attacker need to exploit this issue?

The provided severity vector indicates local attack access and low privileges are required. No user interaction is required.

What conditions trigger the use-after-free?

A vsock must autobind to VMADDR_PORT_ANY and then receive a connection. The socket returned by accept() retains VMADDR_PORT_ANY; attempting to bind that accepted socket causes an extra reference-count decrement and can result in a use-after-free.

What is the remediation described by the fix?

The fix changes __vsock_bind_connectible() to reject binding to VMADDR_PORT_ANY, preventing the invalid binding and extra reference-count decrement.

UBUNTU-CVE-2025-38618: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

Which Ubuntu systems are in scope?

What access does an attacker need to exploit this issue?

What conditions trigger the use-after-free?

What is the remediation described by the fix?

Company

Resources

Contact

Frequently Asked Questions

Which Ubuntu systems are in scope?

What access does an attacker need to exploit this issue?

What conditions trigger the use-after-free?

What is the remediation described by the fix?