CVE-2026-63912: xfrm: esp: restore combined single-frag length gate

Q: What is the severity of CVE-2026-63912?

CVE-2026-63912 has a critical severity rating of 9.8.

Q: What are the potential impacts of CVE-2026-63912?

CVE-2026-63912 may lead to remote code execution due to improper handling of ESP packets.

Q: How do I fix CVE-2026-63912?

To fix CVE-2026-63912, update the Linux kernel to the latest version that addresses this vulnerability.

Q: Which versions of the Linux kernel are affected by CVE-2026-63912?

CVE-2026-63912 affects versions of the Linux kernel prior to the patch released on July 20, 2026.

Q: Is CVE-2026-63912 exploitable remotely?

Yes, CVE-2026-63912 is exploitable remotely given its access vector is categorized as AV:N.

Published Jul 19, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved:

Affected Software

272 affected componentsFixes available

Linux Linux kernel

Linux Linux kernel>=4.14.288<4.15

Linux Linux kernel>=4.19.252<4.20

Linux Linux kernel>=5.4.205<5.5

Linux Linux kernel>=5.10.113<5.10.259

Linux Linux kernel>=5.15.36<5.15.210

Linux Linux kernel>=5.17.5<5.18

Linux Linux kernel>=5.18.1<6.1.176

Linux Linux kernel>=6.2<6.6.143

Linux Linux kernel>=6.7<6.12.93

Linux Linux kernel>=6.13<6.18.35

Linux Linux kernel>=6.19<7.0.12

Linux Linux kernel=5.18

Linux Linux kernel=5.18-rc4

Linux Linux kernel=5.18-rc5

Linux Linux kernel=5.18-rc6

Linux Linux kernel=5.18-rc7

Linux Linux kernel=7.1-rc1

Linux Linux kernel=7.1-rc2

Linux Linux kernel=7.1-rc3

Linux Linux kernel=7.1-rc4

Linux Linux kernel=7.1-rc5

debian/linux<6.1.176-1

6.1.176-1

debian/linux<6.12.94-1

6.12.94-1

debian/linux<7.0.12-1

7.0.12-1

linux/kernel<5.10.259

5.10.259

linux/kernel>=5.11.0<5.15.210

5.15.210

linux/kernel>=5.16.0<6.1.176

6.1.176

linux/kernel>=5.18.0<6.6.143

6.6.143

linux/kernel>=6.2.0<6.12.93

6.12.93

linux/kernel>=6.7.0<6.18.35

6.18.35

linux/kernel>=6.13.0<7.0.12

7.0.12

debian/linux

6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1

ubuntu/linux-azure*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-oracle*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4*

ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4*

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4*

ubuntu/linux-kvm*

ubuntu/linux-oem*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4*

ubuntu/linux-raspi-5.4*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1116.123~20.04.1

5.15.0-1116.123~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1122.131~20.04.1

5.15.0-1122.131~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-azure-fde-5.15<5.15.0-1121.130~20.04.1

5.15.0-1121.130~20.04.1

ubuntu/linux-bluefield*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1118.128~20.04.1

5.15.0-1118.128~20.04.1

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<5.15.0-194.204~20.04.1

5.15.0-194.204~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm*

ubuntu/linux-ibm-5.15<5.15.0-1110.114~20.04.1

5.15.0-1110.114~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1111.117~20.04.1

5.15.0-1111.117~20.04.1

ubuntu/linux-iot*

ubuntu/linux-kvm*

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-194.204~20.04.1

5.15.0-194.204~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1068.70~20.04.1

5.15.0-1068.70~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.15<5.15.0-1114.120~20.04.1

5.15.0-1114.120~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1110.114~20.04.1

5.15.0-1110.114~20.04.1

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-194.204

5.15.0-194.204

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1116.123

5.15.0-1116.123

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1065.68~22.04.1

6.8.0-1065.68~22.04.1

ubuntu/linux-azure<5.15.0-1122.131

5.15.0-1122.131

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1068.76~22.04.1

6.8.0-1068.76~22.04.1

ubuntu/linux-azure-fde<5.15.0-1121.130

5.15.0-1121.130

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8<6.8.0-1066.73~22.04.1

6.8.0-1066.73~22.04.1

ubuntu/linux-gcp<5.15.0-1117.127

5.15.0-1117.127

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1069.77~22.04.1

6.8.0-1069.77~22.04.1

ubuntu/linux-gke<5.15.0-1112.118

5.15.0-1112.118

ubuntu/linux-gkeop<5.15.0-1099.107

5.15.0-1099.107

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-ibm<5.15.0-1110.114

5.15.0-1110.114

ubuntu/linux-ibm-6.8<6.8.0-1066.67~22.04.1

6.8.0-1066.67~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1111.117

5.15.0-1111.117

ubuntu/linux-kvm<5.15.0-1108.113

5.15.0-1108.113

ubuntu/linux-lowlatency<5.15.0-194.204

5.15.0-194.204

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-142.142.1~22.04.1

6.8.0-142.142.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1111.112

5.15.0-1111.112

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1063.66~22.04.1

6.8.0-1063.66~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1068.70

5.15.0-1068.70

ubuntu/linux-nvidia-tegra-igx<5.15.0-1057.57

5.15.0-1057.57

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1113.119

5.15.0-1113.119

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1062.65~22.04.1

6.8.0-1062.65~22.04.1

ubuntu/linux-raspi<5.15.0-1110.113

5.15.0-1110.113

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-142.142~22.04.1

6.8.0-142.142~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1079.83

5.15.0-1079.83

ubuntu/linux-bluefield<5.15.0-1100.102

5.15.0-1100.102

ubuntu/linux-intel-iot-realtime<5.15.0-1108.110

5.15.0-1108.110

ubuntu/linux-realtime<5.15.0-1115.124

5.15.0-1115.124

ubuntu/linux-realtime-6.8<6.8.1-1060.61~22.04.1

6.8.1-1060.61~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1116.123+fips1

5.15.0-1116.123+fips1

ubuntu/linux-azure-fips<5.15.0-1122.131+fips1

5.15.0-1122.131+fips1

ubuntu/linux-fips<5.15.0-194.204+fips1

5.15.0-194.204+fips1

ubuntu/linux-gcp-fips<5.15.0-1116.126+fips1

5.15.0-1116.126+fips1

ubuntu/linux<6.8.0-142.142

6.8.0-142.142

ubuntu/linux-aws<6.8.0-1065.68

6.8.0-1065.68

ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17*

ubuntu/linux-azure<6.8.0-1068.76

6.8.0-1068.76

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14*

ubuntu/linux-azure-6.17*

ubuntu/linux-azure-7.0<7.0.0-1014.14~24.04.1

7.0.0-1014.14~24.04.1

ubuntu/linux-azure-fde<6.8.0-1066.73

6.8.0-1066.73

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-fde-6.17*

ubuntu/linux-azure-fde-7.0<7.0.0-1013.13~24.04.1

7.0.0-1013.13~24.04.1

ubuntu/linux-azure-nvidia*

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1069.77

6.8.0-1069.77

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14*

ubuntu/linux-gcp-7.0<7.0.0-1011.11~24.04.1

7.0.0-1011.11~24.04.1

ubuntu/linux-gke<6.8.0-1064.72

6.8.0-1064.72

ubuntu/linux-gkeop<6.8.0-1050.54

6.8.0-1050.54

ubuntu/linux-hwe-6.11*

ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17*

ubuntu/linux-hwe-7.0<7.0.0-28.28~24.04.1

7.0.0-28.28~24.04.1

ubuntu/linux-ibm<6.8.0-1065.66

6.8.0-1065.66

ubuntu/linux-lowlatency<6.8.0-142.142.1

6.8.0-142.142.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1063.66

6.8.0-1063.66

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-6.17*

ubuntu/linux-nvidia-7.0<7.0.0-1016.16~24.04.1

7.0.0-1016.16~24.04.1

ubuntu/linux-nvidia-lowlatency<6.8.0-1063.66.1

6.8.0-1063.66.1

ubuntu/linux-nvidia-tegra<6.8.0-1035.38

6.8.0-1035.38

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17*

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1062.65

6.8.0-1062.65

ubuntu/linux-oracle-6.14*

ubuntu/linux-oracle-6.17*

ubuntu/linux-oracle-7.0<7.0.0-1011.11~24.04.1

7.0.0-1011.11~24.04.1

ubuntu/linux-raspi<6.8.0-1065.69

6.8.0-1065.69

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17*

ubuntu/linux-riscv-7.0<7.0.0-28.28.1~24.04.3

7.0.0-28.28.1~24.04.3

ubuntu/linux-vmware<6.8.0-1008.8

6.8.0-1008.8

ubuntu/linux-xilinx*

ubuntu/linux-bluefield<6.8.0-1031.36

6.8.0-1031.36

ubuntu/linux-raspi-realtime<6.8.0-2054.56

6.8.0-2054.56

ubuntu/linux-realtime<6.8.1-1060.61

6.8.1-1060.61

ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17*

ubuntu/linux-aws-fips<6.8.0-1065.68+fips1

6.8.0-1065.68+fips1

ubuntu/linux-azure-fips<6.8.0-1068.76+fips1

6.8.0-1068.76+fips1

ubuntu/linux-fips<6.8.0-142.142+fips1

6.8.0-142.142+fips1

ubuntu/linux-gcp-fips<6.8.0-1068.76+fips1

6.8.0-1068.76+fips1

ubuntu/linux<7.0.0-28.28

7.0.0-28.28

ubuntu/linux-aws<7.0.0-1009.9

7.0.0-1009.9

ubuntu/linux-azure<7.0.0-1010.10

7.0.0-1010.10

ubuntu/linux-azure-fde<7.0.0-1009.9

7.0.0-1009.9

ubuntu/linux-gcp<7.0.0-1008.8

7.0.0-1008.8

ubuntu/linux-gke<7.0.0-1003.4

7.0.0-1003.4

ubuntu/linux-ibm<7.0.0-1010.10

7.0.0-1010.10

ubuntu/linux-nvidia<7.0.0-1016.16

7.0.0-1016.16

ubuntu/linux-nvidia-bos<7.0.0-2016.16

7.0.0-2016.16

ubuntu/linux-oem-7.0<7.0.0-1009.9

7.0.0-1009.9

ubuntu/linux-oracle<7.0.0-1008.8

7.0.0-1008.8

ubuntu/linux-raspi<7.0.0-1015.15

7.0.0-1015.15

ubuntu/linux-realtime<7.0.0-28.28.1

7.0.0-28.28.1

ubuntu/linux-riscv<7.0.0-28.28.1

7.0.0-28.28.1

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.1.176-1
Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.12.94-1
Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 7.0.12-1
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 5.10.259
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 5.15.210
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 6.1.176
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 6.6.143
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 6.12.93
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 6.18.35
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 7.0.12
Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1116.123~20.04.1
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1122.131~20.04.1
Upgrade
Upgrade ubuntu/linux-azure-fde-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1121.130~20.04.1
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1118.128~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-194.204~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1110.114~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1111.117~20.04.1
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-194.204~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1068.70~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1114.120~20.04.1
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1110.114~20.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-194.204
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1116.123
Upgrade
Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1065.68~22.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1122.131
Upgrade
Upgrade ubuntu/linux-azure-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1068.76~22.04.1
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1121.130
Upgrade
Upgrade ubuntu/linux-azure-fde-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1066.73~22.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1117.127
Upgrade
Upgrade ubuntu/linux-gcp-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1069.77~22.04.1
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1112.118
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1099.107
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.15.0-1110.114
Upgrade
Upgrade ubuntu/linux-ibm-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1066.67~22.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.
Fixed in 5.15.0-1111.117
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1108.113
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-194.204
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-142.142.1~22.04.1
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 5.15.0-1111.112
Upgrade
Upgrade ubuntu/linux-nvidia-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1063.66~22.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 5.15.0-1068.70
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.
Fixed in 5.15.0-1057.57
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1113.119
Upgrade
Upgrade ubuntu/linux-oracle-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1062.65~22.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.15.0-1110.113
Upgrade
Upgrade ubuntu/linux-riscv-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-142.142~22.04.1
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.15.0-1079.83
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.15.0-1100.102
Upgrade
Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1108.110
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1115.124
Upgrade
Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.1-1060.61~22.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1116.123+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1122.131+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-194.204+fips1
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Fixed in 5.15.0-1116.126+fips1
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Fixed in 6.8.0-142.142
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Fixed in 6.8.0-1065.68
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Fixed in 6.8.0-1068.76
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Fixed in 7.0.0-1014.14~24.04.1
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Fixed in 6.8.0-1066.73
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Fixed in 7.0.0-1013.13~24.04.1
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Fixed in 6.8.0-1069.77
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Fixed in 7.0.0-1011.11~24.04.1
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Fixed in 6.8.0-1064.72
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Fixed in 6.8.0-1050.54
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Fixed in 7.0.0-28.28~24.04.1
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Fixed in 6.8.0-1065.66
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Fixed in 6.8.0-142.142.1
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Fixed in 6.8.0-1063.66
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Fixed in 7.0.0-1016.16~24.04.1
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Fixed in 6.8.0-1063.66.1
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Fixed in 6.8.0-1035.38
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Fixed in 6.8.0-1062.65
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Fixed in 7.0.0-1011.11~24.04.1
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Fixed in 6.8.0-1065.69
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Fixed in 7.0.0-28.28.1~24.04.3
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Fixed in 6.8.0-1008.8
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Fixed in 6.8.0-1031.36
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Fixed in 6.8.0-2054.56
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Fixed in 6.8.1-1060.61
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Fixed in 6.8.0-1065.68+fips1
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Fixed in 6.8.0-1068.76+fips1
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Fixed in 6.8.0-142.142+fips1
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Fixed in 6.8.0-1068.76+fips1
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Fixed in 7.0.0-28.28
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Fixed in 7.0.0-1009.9
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Fixed in 7.0.0-1010.10
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Fixed in 7.0.0-1009.9
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Fixed in 7.0.0-1008.8
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Fixed in 7.0.0-1003.4
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Fixed in 7.0.0-1010.10
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Fixed in 7.0.0-1016.16
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Fixed in 7.0.0-2016.16
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Fixed in 7.0.0-1009.9
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Fixed in 7.0.0-1008.8
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Fixed in 7.0.0-1015.15
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Fixed in 7.0.0-28.28.1
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Fixed in 7.0.0-28.28.1

Event History

Jul 19, 2026

CVE Published

via MITRE·02:55 PM

Data Sourced

via MITRE·02:55 PM

DescriptionSeverity

Data Sourced

via OSV·02:55 PM

DescriptionSeverityAffected Software

Data Sourced

via NVD·04:17 PM

RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-63912?

CVE-2026-63912 has a critical severity rating of 9.8.

What are the potential impacts of CVE-2026-63912?

CVE-2026-63912 may lead to remote code execution due to improper handling of ESP packets.

How do I fix CVE-2026-63912?

To fix CVE-2026-63912, update the Linux kernel to the latest version that addresses this vulnerability.

Which versions of the Linux kernel are affected by CVE-2026-63912?

CVE-2026-63912 affects versions of the Linux kernel prior to the patch released on July 20, 2026.

Is CVE-2026-63912 exploitable remotely?

Yes, CVE-2026-63912 is exploitable remotely given its access vector is categorized as AV:N.

CVE-2026-63912: xfrm: esp: restore combined single-frag length gate

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2026-63912?

What are the potential impacts of CVE-2026-63912?

How do I fix CVE-2026-63912?

Which versions of the Linux kernel are affected by CVE-2026-63912?

Is CVE-2026-63912 exploitable remotely?

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