UBUNTU-CVE-2026-31668: Medium severity ubuntu/linux-azure vulnerability

Q: Which systems are exposed to this issue?

Systems using the affected Ubuntu Linux kernel packages are exposed when they use SEG6 lightweight tunnels with an encapsulation route and have routing contexts that can differ between input and output processing, such as policy rules matching the ingress interface or separate VRF routing tables.

Q: What conditions are needed for the routing bypass to occur?

The input and output SEG6 processing paths must perform post-encapsulation SID lookups in different routing contexts. Because the vulnerable implementation shares one destination cache, the path that runs first can populate it and cause the other path to reuse that route instead of performing its own lookup.

Q: Is an attacker required to authenticate or interact with a user?

The supplied severity vector indicates network reachability, low attack complexity, no privileges required, and no user interaction. It also indicates that attack requirements are present (AT:P).

Q: What is the impact of successful exploitation?

The supplied vector rates the impact as low on vulnerable-system integrity and none on confidentiality or availability. The described behavior can bypass the routing lookup that should be performed in the affected path.

Published Apr 24, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved: seg6: separate dstcache for input and output paths in seg6 lwtunnel The seg6 lwtunnel uses a single dstcache per encap route, shared between seg6inputcore() and seg6outputcore(). These two paths can perform the post-encap SID lookup in different routing contexts (e.g., ip rules matching on the ingress interface, or VRF table separation). Whichever path runs first populates the cache, and the other reuses it blindly, bypassing its own lookup. Fix this by splitting the cache into cacheinput and cacheoutput, so each path maintains its own cached dst independently.

Affected Software

237 affected componentsFixes available

ubuntu/linux-azure<4.15.0-1205.220~14.04.1

4.15.0-1205.220~14.04.1

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-oracle<4.15.0-1158.169~16.04.1

4.15.0-1158.169~16.04.1

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<5.15.0-1111.118~20.04.1

5.15.0-1111.118~20.04.1

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<5.15.0-1116.125~20.04.1

5.15.0-1116.125~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-azure-fde-5.15<5.15.0-1116.125~20.04.1

5.15.0-1116.125~20.04.1

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<5.15.0-1111.121~20.04.1

5.15.0-1111.121~20.04.1

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<5.15.0-185.195~20.04.1

5.15.0-185.195~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm<5.4.0-1108.113

5.4.0-1108.113

ubuntu/linux-ibm-5.15<5.15.0-1105.109~20.04.1

5.15.0-1105.109~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1106.112~20.04.1

5.15.0-1106.112~20.04.1

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<5.15.0-183.193~20.04.1

5.15.0-183.193~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1063.63~20.04.1

5.15.0-1063.63~20.04.1

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<5.15.0-1108.114~20.04.1

5.15.0-1108.114~20.04.1

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<5.15.0-1105.109~20.04.1

5.15.0-1105.109~20.04.1

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<5.15.0-185.195

5.15.0-185.195

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1111.118

5.15.0-1111.118

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

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

6.8.0-1060.63~22.04.1

ubuntu/linux-azure<5.15.0-1116.125

5.15.0-1116.125

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1063.71~22.04.1

6.8.0-1063.71~22.04.1

ubuntu/linux-azure-fde<5.15.0-1116.125

5.15.0-1116.125

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8<6.8.0-1062.69~22.04.1

6.8.0-1062.69~22.04.1

ubuntu/linux-gcp<5.15.0-1111.121

5.15.0-1111.121

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1063.69~22.04.1

6.8.0-1063.69~22.04.1

ubuntu/linux-gke<5.15.0-1107.113

5.15.0-1107.113

ubuntu/linux-gkeop<5.15.0-1094.102

5.15.0-1094.102

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-136.136~22.04.1

6.8.0-136.136~22.04.1

ubuntu/linux-ibm<5.15.0-1105.109

5.15.0-1105.109

ubuntu/linux-ibm-6.8<6.8.0-1060.61~22.04.1

6.8.0-1060.61~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1106.112

5.15.0-1106.112

ubuntu/linux-kvm<5.15.0-1103.108

5.15.0-1103.108

ubuntu/linux-lowlatency<5.15.0-183.193

5.15.0-183.193

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-134.134.1~22.04.1

6.8.0-134.134.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1106.107

5.15.0-1106.107

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1058.61~22.04.1

6.8.0-1058.61~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1063.63

5.15.0-1063.63

ubuntu/linux-nvidia-tegra-igx<5.15.0-1052.52

5.15.0-1052.52

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1108.114

5.15.0-1108.114

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1057.58~22.04.1

6.8.0-1057.58~22.04.1

ubuntu/linux-raspi<5.15.0-1105.108

5.15.0-1105.108

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-134.134~22.04.1

6.8.0-134.134~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1074.78

5.15.0-1074.78

ubuntu/linux-bluefield<5.15.0-1095.97

5.15.0-1095.97

ubuntu/linux-intel-iot-realtime<5.15.0-1103.105

5.15.0-1103.105

ubuntu/linux-realtime<5.15.0-1110.119

5.15.0-1110.119

ubuntu/linux-realtime-6.8<6.8.1-1055.56~22.04.1

6.8.1-1055.56~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1111.118+fips1

5.15.0-1111.118+fips1

ubuntu/linux-azure-fips<5.15.0-1116.125+fips1

5.15.0-1116.125+fips1

ubuntu/linux-fips<5.15.0-185.195+fips1

5.15.0-185.195+fips1

ubuntu/linux-gcp-fips<5.15.0-1111.121+fips1

5.15.0-1111.121+fips1

ubuntu/linux<6.8.0-134.134

6.8.0-134.134

ubuntu/linux-aws<6.8.0-1060.63

6.8.0-1060.63

ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17<6.17.0-1019.19~24.04.1

6.17.0-1019.19~24.04.1

ubuntu/linux-azure<6.8.0-1063.71

6.8.0-1063.71

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14*

ubuntu/linux-azure-6.17<6.17.0-1021.21~24.04.1

6.17.0-1021.21~24.04.1

ubuntu/linux-azure-fde<6.8.0-1062.69

6.8.0-1062.69

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-nvidia*

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1063.69

6.8.0-1063.69

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14*

ubuntu/linux-gcp-6.17<6.17.0-1020.22~24.04.1

6.17.0-1020.22~24.04.1

ubuntu/linux-gke<6.8.0-1058.64

6.8.0-1058.64

ubuntu/linux-gkeop<6.8.0-1045.48

6.8.0-1045.48

ubuntu/linux-hwe-6.11*

ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17<6.17.0-40.40~24.04.1

6.17.0-40.40~24.04.1

ubuntu/linux-ibm<6.8.0-1060.61

6.8.0-1060.61

ubuntu/linux-lowlatency<6.8.0-134.134.1

6.8.0-134.134.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1058.61

6.8.0-1058.61

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-6.17<6.17.0-1026.26

6.17.0-1026.26

ubuntu/linux-nvidia-lowlatency<6.8.0-1058.61.1

6.8.0-1058.61.1

ubuntu/linux-nvidia-tegra<6.8.0-1029.30

6.8.0-1029.30

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17<6.17.0-1028.28

6.17.0-1028.28

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1057.58

6.8.0-1057.58

ubuntu/linux-oracle-6.14*

ubuntu/linux-oracle-6.17<6.17.0-1018.18~24.04.1

6.17.0-1018.18~24.04.1

ubuntu/linux-raspi<6.8.0-1060.64

6.8.0-1060.64

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<6.8.0-1032.33

6.8.0-1032.33

ubuntu/linux-bluefield<6.8.0-1026.30

6.8.0-1026.30

ubuntu/linux-raspi-realtime<6.8.0-2049.50

6.8.0-2049.50

ubuntu/linux-realtime<6.8.1-1055.56

6.8.1-1055.56

ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17<6.17.0-1017.19~24.04.1

6.17.0-1017.19~24.04.1

ubuntu/linux-aws-fips<6.8.0-1060.63+fips1

6.8.0-1060.63+fips1

ubuntu/linux-azure-fips<6.8.0-1062.69+fips1

6.8.0-1062.69+fips1

ubuntu/linux-fips<6.8.0-134.134+fips1

6.8.0-134.134+fips1

ubuntu/linux-gcp-fips<6.8.0-1063.69+fips1

6.8.0-1063.69+fips1

ubuntu/linux<6.17.0-40.40

6.17.0-40.40

ubuntu/linux-aws<6.17.0-1019.19

6.17.0-1019.19

ubuntu/linux-azure*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp<6.17.0-1020.22

6.17.0-1020.22

ubuntu/linux-oracle<6.17.0-1018.18

6.17.0-1018.18

ubuntu/linux-raspi<6.17.0-1021.21

6.17.0-1021.21

ubuntu/linux-realtime<6.17.0-1017.19

6.17.0-1017.19

ubuntu/linux-riscv<6.17.0-40.40.1

6.17.0-40.40.1

ubuntu/linux-nvidia<7.0.0-1006.6

7.0.0-1006.6

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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-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-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1158.169~16.04.1
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 5.15.0-1111.118~20.04.1
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 5.15.0-1116.125~20.04.1
Upgrade
Upgrade ubuntu/linux-azure-fde-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1116.125~20.04.1
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 5.15.0-1111.121~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-185.195~20.04.1
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 5.15.0-1105.109~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1106.112~20.04.1
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 5.15.0-183.193~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1063.63~20.04.1
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 5.15.0-1108.114~20.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1145.158
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Fixed in 5.15.0-1105.109~20.04.1
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Fixed in 5.4.0-1080.84
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Fixed in 5.4.0-1163.174+fips1
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Fixed in 5.4.0-1167.173+fips1
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Fixed in 5.4.0-1136.146
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Fixed in 5.4.0-1165.174+fips1
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Fixed in 5.15.0-185.195
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Fixed in 5.15.0-1111.118
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Fixed in 6.8.0-1060.63~22.04.1
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Fixed in 5.15.0-1116.125
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Fixed in 6.8.0-1063.71~22.04.1
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Fixed in 5.15.0-1116.125
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Fixed in 6.8.0-1062.69~22.04.1
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Fixed in 5.15.0-1111.121
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Fixed in 6.8.0-1063.69~22.04.1
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Fixed in 5.15.0-1107.113
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Fixed in 5.15.0-1094.102
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Fixed in 6.8.0-136.136~22.04.1
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Fixed in 5.15.0-1105.109
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Fixed in 6.8.0-1060.61~22.04.1
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Fixed in 5.15.0-1106.112
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Fixed in 5.15.0-1103.108
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Fixed in 5.15.0-183.193
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Fixed in 6.8.0-134.134.1~22.04.1
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Fixed in 5.15.0-1106.107
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Fixed in 6.8.0-1058.61~22.04.1
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Fixed in 5.15.0-1063.63
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Fixed in 5.15.0-1052.52
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Fixed in 5.15.0-1108.114
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Fixed in 6.8.0-1057.58~22.04.1
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Fixed in 5.15.0-1105.108
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Fixed in 6.8.0-134.134~22.04.1
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Fixed in 5.15.0-1074.78
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Fixed in 5.15.0-1095.97
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Fixed in 5.15.0-1103.105
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Fixed in 5.15.0-1110.119
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Fixed in 6.8.1-1055.56~22.04.1
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Fixed in 5.15.0-1111.118+fips1
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Fixed in 5.15.0-1116.125+fips1
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Fixed in 5.15.0-185.195+fips1
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Fixed in 5.15.0-1111.121+fips1
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Fixed in 6.8.0-134.134
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Fixed in 6.8.0-1060.63
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Fixed in 6.17.0-1019.19~24.04.1
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Fixed in 6.8.0-1063.71
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Fixed in 6.17.0-1021.21~24.04.1
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Fixed in 6.8.0-1062.69
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Fixed in 6.8.0-1063.69
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Fixed in 6.17.0-1020.22~24.04.1
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Fixed in 6.8.0-1058.64
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Fixed in 6.8.0-1045.48
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Fixed in 6.17.0-40.40~24.04.1
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Fixed in 6.8.0-1060.61
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Fixed in 6.8.0-134.134.1
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Fixed in 6.8.0-1058.61
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Fixed in 6.17.0-1026.26
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Fixed in 6.8.0-1058.61.1
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Fixed in 6.8.0-1029.30
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Fixed in 6.17.0-1028.28
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Fixed in 6.8.0-1057.58
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Fixed in 6.17.0-1018.18~24.04.1
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Fixed in 6.8.0-1060.64
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Fixed in 6.8.0-1008.8
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Fixed in 6.8.0-1032.33
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Fixed in 6.8.0-1026.30
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Fixed in 6.8.0-2049.50
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Fixed in 6.8.1-1055.56
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Fixed in 6.17.0-1017.19~24.04.1
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Fixed in 6.8.0-1060.63+fips1
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Fixed in 6.8.0-1062.69+fips1
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Fixed in 6.8.0-134.134+fips1
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Fixed in 6.8.0-1063.69+fips1
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Fixed in 6.17.0-40.40
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Fixed in 6.17.0-1019.19
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Fixed in 6.17.0-1020.22
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Fixed in 6.17.0-1018.18
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Fixed in 6.17.0-1021.21
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Fixed in 6.17.0-1017.19
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Fixed in 6.17.0-40.40.1
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Fixed in 7.0.0-1006.6

Event History

Apr 24, 2026

CVE Published

via OSV·03:16 PM

Data Sourced

via OSV·03:16 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which systems are exposed to this issue?

Systems using the affected Ubuntu Linux kernel packages are exposed when they use SEG6 lightweight tunnels with an encapsulation route and have routing contexts that can differ between input and output processing, such as policy rules matching the ingress interface or separate VRF routing tables.

What conditions are needed for the routing bypass to occur?

The input and output SEG6 processing paths must perform post-encapsulation SID lookups in different routing contexts. Because the vulnerable implementation shares one destination cache, the path that runs first can populate it and cause the other path to reuse that route instead of performing its own lookup.

Is an attacker required to authenticate or interact with a user?

The supplied severity vector indicates network reachability, low attack complexity, no privileges required, and no user interaction. It also indicates that attack requirements are present (AT:P).

What is the impact of successful exploitation?

The supplied vector rates the impact as low on vulnerable-system integrity and none on confidentiality or availability. The described behavior can bypass the routing lookup that should be performed in the affected path.

UBUNTU-CVE-2026-31668: Medium severity ubuntu/linux-azure vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

Which systems are exposed to this issue?

What conditions are needed for the routing bypass to occur?

Is an attacker required to authenticate or interact with a user?

What is the impact of successful exploitation?

Company

Resources

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