UBUNTU-CVE-2026-43198: High severity ubuntu/linux vulnerability

Q: What access does an attacker need?

The vector is network-based, and the CVSS data indicates no privileges or user interaction are required. It also indicates an additional attack requirement is present, but the provided information does not specify what that requirement is.

Q: Which Ubuntu kernel package families are in scope?

The affected software list includes ubuntu/linux, ubuntu/linux-fips, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, and the corresponding AWS, Azure, and GCP FIPS kernel packages. No affected or fixed package versions are provided.

Q: What impact is indicated by the available severity data?

The CVSS vector indicates high availability impact, with no confidentiality or integrity impact. The description concerns a race condition involving a child socket becoming visible to other CPUs before its IPv6 state is correctly initialized.

Q: Is a default configuration known to be affected?

The provided information does not state whether the vulnerable code path is enabled or reachable in default configurations.

Published May 6, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved: tcp: fix potential race in tcpv6synrecvsock() Code in tcpv6synrecvsock() after the call to tcpv4synrecvsock() is done too late. After tcpv4synrecvsock(), the child socket is already visible from TCP ehash table and other cpus might use it. Since newinet->pinet6 is still pointing to the listener ipv6pinfo bad things can happen as syzbot found. Move the problematic code in tcpv6mappedchildinit() and call this new helper from tcpv4synrecvsock() before the ehash insertion. This allows the removal of one tcpsyncmss(), since tcpv4synrecvsock() will call it with the correct context.

Affected Software

244 affected componentsFixes available

ubuntu/linux<3.13.0-215.266

3.13.0-215.266

ubuntu/linux-aws<4.4.0-1157.163

4.4.0-1157.163

ubuntu/linux-azure<4.15.0-1205.220~14.04.1

4.15.0-1205.220~14.04.1

ubuntu/linux-lts-xenial<4.4.0-284.318~14.04.1

4.4.0-284.318~14.04.1

ubuntu/linux<4.4.0-284.318

4.4.0-284.318

ubuntu/linux-aws<4.4.0-1195.210

4.4.0-1195.210

ubuntu/linux-aws-hwe<4.15.0-1195.208~16.04.1

4.15.0-1195.208~16.04.1

ubuntu/linux-azure<4.15.0-1205.220~16.04.1

4.15.0-1205.220~16.04.1

ubuntu/linux-gcp<4.15.0-1188.205~16.04.1

4.15.0-1188.205~16.04.1

ubuntu/linux-hwe<4.15.0-254.266~16.04.1

4.15.0-254.266~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm<4.4.0-1158.169

4.4.0-1158.169

ubuntu/linux-oracle<4.15.0-1158.169~16.04.1

4.15.0-1158.169~16.04.1

ubuntu/linux-fips<4.4.0-1127.134

4.4.0-1127.134

ubuntu/linux-fips*

ubuntu/linux<4.15.0-254.266

4.15.0-254.266

ubuntu/linux-aws<4.15.0-1195.208

4.15.0-1195.208

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1162.173~18.04.1

5.4.0-1162.173~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15<4.15.0-1205.220

4.15.0-1205.220

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1167.173~18.04.1

5.4.0-1167.173~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15<4.15.0-1188.205

4.15.0-1188.205

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1165.174~18.04.1

5.4.0-1165.174~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-234.254~18.04.1

5.4.0-234.254~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1108.113~18.04.1

5.4.0-1108.113~18.04.1

ubuntu/linux-kvm<4.15.0-1177.182

4.15.0-1177.182

ubuntu/linux-oem*

ubuntu/linux-oracle<4.15.0-1158.169

4.15.0-1158.169

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1161.171~18.04.1

5.4.0-1161.171~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1145.158~18.04.1

5.4.0-1145.158~18.04.1

ubuntu/linux-aws-fips<4.15.0-2133.139

4.15.0-2133.139

ubuntu/linux-azure-fips<4.15.0-2113.119

4.15.0-2113.119

ubuntu/linux-fips<4.15.0-1150.162

4.15.0-1150.162

ubuntu/linux-gcp-fips<4.15.0-2096.102

4.15.0-2096.102

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-234.254

5.4.0-234.254

ubuntu/linux-aws<5.4.0-1162.173

5.4.0-1162.173

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1114.121~20.04.1

5.15.0-1114.121~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure<5.4.0-1167.173

5.4.0-1167.173

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1119.128~20.04.1

5.15.0-1119.128~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-azure-fde-5.15<5.15.0-1118.127~20.04.1

5.15.0-1118.127~20.04.1

ubuntu/linux-bluefield<5.4.0-1121.128

5.4.0-1121.128

ubuntu/linux-gcp<5.4.0-1165.174

5.4.0-1165.174

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1114.124~20.04.1

5.15.0-1114.124~20.04.1

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<5.15.0-190.200~20.04.1

5.15.0-190.200~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm<5.4.0-1108.113

5.4.0-1108.113

ubuntu/linux-ibm-5.15<5.15.0-1107.111~20.04.1

5.15.0-1107.111~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1108.114~20.04.1

5.15.0-1108.114~20.04.1

ubuntu/linux-iot<5.4.0-1066.69

5.4.0-1066.69

ubuntu/linux-kvm<5.4.0-1149.158

5.4.0-1149.158

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-190.200~20.04.1

5.15.0-190.200~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1065.67~20.04.1

5.15.0-1065.67~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle<5.4.0-1160.170

5.4.0-1160.170

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.15<5.15.0-1110.116~20.04.1

5.15.0-1110.116~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi<5.4.0-1145.158

5.4.0-1145.158

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1107.111~20.04.1

5.15.0-1107.111~20.04.1

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp<5.4.0-1080.84

5.4.0-1080.84

ubuntu/linux-aws-fips<5.4.0-1163.174+fips1

5.4.0-1163.174+fips1

ubuntu/linux-azure-fips<5.4.0-1167.173+fips1

5.4.0-1167.173+fips1

ubuntu/linux-fips<5.4.0-1136.146

5.4.0-1136.146

ubuntu/linux-gcp-fips<5.4.0-1165.174+fips1

5.4.0-1165.174+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-187.197

5.15.0-187.197

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1113.120

5.15.0-1113.120

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1062.65~22.04.2

6.8.0-1062.65~22.04.2

ubuntu/linux-azure<5.15.0-1118.127

5.15.0-1118.127

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1064.72~22.04.1

6.8.0-1064.72~22.04.1

ubuntu/linux-azure-fde<5.15.0-1118.127

5.15.0-1118.127

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8<6.8.0-1063.70~22.04.1

6.8.0-1063.70~22.04.1

ubuntu/linux-gcp<5.15.0-1114.124

5.15.0-1114.124

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1065.73~22.04.1

6.8.0-1065.73~22.04.1

ubuntu/linux-gke<5.15.0-1110.116

5.15.0-1110.116

ubuntu/linux-gkeop<5.15.0-1096.104

5.15.0-1096.104

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-138.138~22.04.1

6.8.0-138.138~22.04.1

ubuntu/linux-ibm<5.15.0-1107.111

5.15.0-1107.111

ubuntu/linux-ibm-6.8<6.8.0-1062.63~22.04.1

6.8.0-1062.63~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1108.114

5.15.0-1108.114

ubuntu/linux-kvm<5.15.0-1105.110

5.15.0-1105.110

ubuntu/linux-lowlatency<5.15.0-190.200

5.15.0-190.200

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-137.137.1~22.04.1

6.8.0-137.137.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1108.109

5.15.0-1108.109

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1060.63~22.04.1

6.8.0-1060.63~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1065.67

5.15.0-1065.67

ubuntu/linux-nvidia-tegra-igx<5.15.0-1054.54

5.15.0-1054.54

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1110.116

5.15.0-1110.116

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1059.62~22.04.1

6.8.0-1059.62~22.04.1

ubuntu/linux-raspi<5.15.0-1108.111

5.15.0-1108.111

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-137.137~22.04.1

6.8.0-137.137~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1076.80

5.15.0-1076.80

ubuntu/linux-bluefield<5.15.0-1097.99

5.15.0-1097.99

ubuntu/linux-intel-iot-realtime<5.15.0-1105.107

5.15.0-1105.107

ubuntu/linux-realtime<5.15.0-1112.121

5.15.0-1112.121

ubuntu/linux-realtime-6.8<6.8.1-1057.58~22.04.1

6.8.1-1057.58~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1113.120+fips1

5.15.0-1113.120+fips1

ubuntu/linux-azure-fips<5.15.0-1118.127+fips1

5.15.0-1118.127+fips1

ubuntu/linux-fips<5.15.0-190.200+fips1

5.15.0-190.200+fips1

ubuntu/linux-gcp-fips<5.15.0-1114.124+fips1

5.15.0-1114.124+fips1

ubuntu/linux<6.8.0-137.137

6.8.0-137.137

ubuntu/linux-aws<6.8.0-1062.65

6.8.0-1062.65

ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17*

ubuntu/linux-azure<6.8.0-1064.72

6.8.0-1064.72

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14*

ubuntu/linux-azure-6.17<6.17.0-1022.22

6.17.0-1022.22

ubuntu/linux-azure-fde<6.8.0-1063.70

6.8.0-1063.70

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-fde-6.17*

ubuntu/linux-azure-nvidia*

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1065.73

6.8.0-1065.73

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14*

ubuntu/linux-gcp-6.17<6.17.0-1022.25

6.17.0-1022.25

ubuntu/linux-gke<6.8.0-1060.68

6.8.0-1060.68

ubuntu/linux-gkeop<6.8.0-1047.51

6.8.0-1047.51

ubuntu/linux-hwe-6.11*

ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17<6.17.0-42.42

6.17.0-42.42

ubuntu/linux-ibm<6.8.0-1062.63

6.8.0-1062.63

ubuntu/linux-lowlatency<6.8.0-137.137.1

6.8.0-137.137.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1060.63

6.8.0-1060.63

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-6.17<6.17.0-1031.31

6.17.0-1031.31

ubuntu/linux-nvidia-lowlatency<6.8.0-1060.63.1

6.8.0-1060.63.1

ubuntu/linux-nvidia-tegra<6.8.0-1031.32

6.8.0-1031.32

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17<6.17.0-1032.32

6.17.0-1032.32

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1059.62

6.8.0-1059.62

ubuntu/linux-oracle-6.14*

ubuntu/linux-oracle-6.17<6.17.0-1020.20

6.17.0-1020.20

ubuntu/linux-raspi<6.8.0-1062.66

6.8.0-1062.66

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17*

ubuntu/linux-vmware<6.8.0-1008.8

6.8.0-1008.8

ubuntu/linux-xilinx<6.8.0-1034.35

6.8.0-1034.35

ubuntu/linux-bluefield<6.8.0-1028.33

6.8.0-1028.33

ubuntu/linux-raspi-realtime<6.8.0-2051.53

6.8.0-2051.53

ubuntu/linux-realtime<6.8.1-1057.58

6.8.1-1057.58

ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17<6.17.0-1019.22

6.17.0-1019.22

ubuntu/linux-aws-fips<6.8.0-1062.65+fips1

6.8.0-1062.65+fips1

ubuntu/linux-azure-fips<6.8.0-1064.72+fips1

6.8.0-1064.72+fips1

ubuntu/linux-fips<6.8.0-137.137+fips1

6.8.0-137.137+fips1

ubuntu/linux-gcp-fips<6.8.0-1065.73+fips1

6.8.0-1065.73+fips1

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp*

ubuntu/linux-oracle*

ubuntu/linux-raspi*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 3.13.0-215.266
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1157.163
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1205.220~14.04.1
Upgrade
Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.
Fixed in 4.4.0-284.318~14.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.4.0-284.318
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1195.210
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1195.208~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1205.220~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1188.205~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-254.266~16.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.4.0-1158.169
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1158.169~16.04.1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.4.0-1127.134
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-254.266
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1195.208
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1162.173~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1205.220
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1167.173~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1188.205
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1165.174~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-234.254~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1108.113~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1177.182
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1158.169
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1161.171~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1145.158~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2133.139
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2113.119
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1150.162
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2096.102
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-234.254
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1162.173
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1114.121~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1167.173
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1119.128~20.04.1
Upgrade
Upgrade ubuntu/linux-azure-fde-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1118.127~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1121.128
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1165.174
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1114.124~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-190.200~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1108.113
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1107.111~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1108.114~20.04.1
Upgrade
Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1066.69
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1149.158
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-190.200~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1065.67~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1160.170
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1110.116~20.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1145.158
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1107.111~20.04.1
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.4.0-1080.84
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1163.174+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1167.173+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1136.146
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1165.174+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-187.197
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1113.120
Upgrade
Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1062.65~22.04.2
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1118.127
Upgrade
Upgrade ubuntu/linux-azure-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1064.72~22.04.1
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1118.127
Upgrade
Upgrade ubuntu/linux-azure-fde-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1063.70~22.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1114.124
Upgrade
Upgrade ubuntu/linux-gcp-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1065.73~22.04.1
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1110.116
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1096.104
Upgrade
Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-138.138~22.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.15.0-1107.111
Upgrade
Upgrade ubuntu/linux-ibm-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1062.63~22.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.
Fixed in 5.15.0-1108.114
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1105.110
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-190.200
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-137.137.1~22.04.1
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 5.15.0-1108.109
Upgrade
Upgrade ubuntu/linux-nvidia-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1060.63~22.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 5.15.0-1065.67
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.
Fixed in 5.15.0-1054.54
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1110.116
Upgrade
Upgrade ubuntu/linux-oracle-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1059.62~22.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.15.0-1108.111
Upgrade
Upgrade ubuntu/linux-riscv-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-137.137~22.04.1
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.15.0-1076.80
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.15.0-1097.99
Upgrade
Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1105.107
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1112.121
Upgrade
Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.1-1057.58~22.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1113.120+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1118.127+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-190.200+fips1
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1114.124+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 6.8.0-137.137
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 6.8.0-1062.65
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 6.8.0-1064.72
Upgrade
Upgrade ubuntu/linux-azure-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1022.22
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 6.8.0-1063.70
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 6.8.0-1065.73
Upgrade
Upgrade ubuntu/linux-gcp-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1022.25
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 6.8.0-1060.68
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 6.8.0-1047.51
Upgrade
Upgrade ubuntu/linux-hwe-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-42.42
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 6.8.0-1062.63
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 6.8.0-137.137.1
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 6.8.0-1060.63
Upgrade
Upgrade ubuntu/linux-nvidia-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1031.31
Upgrade
Upgrade ubuntu/linux-nvidia-lowlatency to a version that resolves this vulnerability.
Fixed in 6.8.0-1060.63.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 6.8.0-1031.32
Upgrade
Upgrade ubuntu/linux-oem-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1032.32
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 6.8.0-1059.62
Upgrade
Upgrade ubuntu/linux-oracle-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1020.20
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 6.8.0-1062.66
Upgrade
Upgrade ubuntu/linux-vmware to a version that resolves this vulnerability.
Fixed in 6.8.0-1008.8
Upgrade
Upgrade ubuntu/linux-xilinx to a version that resolves this vulnerability.
Fixed in 6.8.0-1034.35
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 6.8.0-1028.33
Upgrade
Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.
Fixed in 6.8.0-2051.53
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 6.8.1-1057.58
Upgrade
Upgrade ubuntu/linux-realtime-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1019.22
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1062.65+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1064.72+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-137.137+fips1
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1065.73+fips1

Event History

May 6, 2026

CVE Published

via OSV·12:16 PM

Data Sourced

via OSV·12:16 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

What access does an attacker need?

The vector is network-based, and the CVSS data indicates no privileges or user interaction are required. It also indicates an additional attack requirement is present, but the provided information does not specify what that requirement is.

Which Ubuntu kernel package families are in scope?

The affected software list includes ubuntu/linux, ubuntu/linux-fips, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, and the corresponding AWS, Azure, and GCP FIPS kernel packages. No affected or fixed package versions are provided.

What impact is indicated by the available severity data?

The CVSS vector indicates high availability impact, with no confidentiality or integrity impact. The description concerns a race condition involving a child socket becoming visible to other CPUs before its IPv6 state is correctly initialized.

Is a default configuration known to be affected?

The provided information does not state whether the vulnerable code path is enabled or reachable in default configurations.

UBUNTU-CVE-2026-43198: High severity ubuntu/linux vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

What access does an attacker need?

Which Ubuntu kernel package families are in scope?

What impact is indicated by the available severity data?

Is a default configuration known to be affected?

Company

Resources

Contact

Frequently Asked Questions

What access does an attacker need?

Which Ubuntu kernel package families are in scope?

What impact is indicated by the available severity data?

Is a default configuration known to be affected?