CVE-2026-31664: xfrm: clear trailing padding in build_polexpire()

Q: What is the severity of CVE-2026-31664?

CVE-2026-31664 is classified as a medium-severity vulnerability in the Linux kernel.

Q: How do I fix CVE-2026-31664?

To mitigate CVE-2026-31664, update your Linux kernel to the latest stable version that addresses this vulnerability.

Q: What type of vulnerability is CVE-2026-31664?

CVE-2026-31664 is a clearing trailing padding vulnerability in the xfrm subsystem of the Linux kernel.

Q: Which versions of the Linux kernel are affected by CVE-2026-31664?

CVE-2026-31664 affects multiple versions of the Linux kernel prior to the security patch release addressing this issue.

Q: Is CVE-2026-31664 a remote code execution vulnerability?

CVE-2026-31664 is not classified as a remote code execution vulnerability, but it can impact the security of systems using the affected kernel.

Published Apr 24, 2026

Updated

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

xfrm: clear trailing padding in buildpolexpire()

buildexpire() clears the trailing padding bytes of struct xfrmuserexpire after setting the hard field via memsetafter(), but the analogous function buildpolexpire() does not do this for struct xfrmuserpolexpire.

The padding bytes after the u8 hard field are left uninitialized from the heap allocation, and are then sent to userspace via netlink multicast to XFRMNLGRPEXPIRE listeners, leaking kernel heap memory contents.

Add the missing memsetafter() call, matching buildexpire().

Affected Software

263 affected componentsFixes available

Linux Linux kernel

Microsoft azl3 kernel 6.6.134.1-2

Patch available

Linux Linux kernel>=2.6.12.1<6.1.169

Linux Linux kernel>=6.2<6.6.135

Linux Linux kernel>=6.7<6.12.82

Linux Linux kernel>=6.13<6.18.23

Linux Linux kernel>=6.19<6.19.13

Linux Linux kernel=2.6.12

Linux Linux kernel=2.6.12-rc2

Linux Linux kernel=2.6.12-rc3

Linux Linux kernel=2.6.12-rc4

Linux Linux kernel=2.6.12-rc5

Linux Linux kernel=7.0-rc1

Linux Linux kernel=7.0-rc2

Linux Linux kernel=7.0-rc3

Linux Linux kernel=7.0-rc4

Linux Linux kernel=7.0-rc5

Linux Linux kernel=7.0-rc6

Linux Linux kernel=7.0-rc7

Microsoft azl3 kernel 6.6.134.1-2<6.6.137.1-1

6.6.137.1-1

debian/linux

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

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

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ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

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ubuntu/linux-intel-iot-realtime*

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ubuntu/linux-lowlatency<5.15.0-184.194

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ubuntu/linux-lowlatency-hwe-5.19*

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ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-136.136.2~22.04.1

6.8.0-136.136.2~22.04.1

ubuntu/linux-nvidia<5.15.0-1107.108

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ubuntu/linux-nvidia-6.2*

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ubuntu/linux-nvidia-tegra<5.15.0-1064.66

5.15.0-1064.66

ubuntu/linux-nvidia-tegra-igx<5.15.0-1053.53

5.15.0-1053.53

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

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ubuntu/linux-oracle<5.15.0-1109.115

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ubuntu/linux-oracle-6.5*

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ubuntu/linux-raspi<5.15.0-1106.109

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ubuntu/linux-realtime*

ubuntu/linux-riscv*

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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*

ubuntu/linux-nvidia<7.0.0-1006.6

7.0.0-1006.6

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1063.71+fips2
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-136.136+fips2
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1064.72+fips1
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 7.0.0-1006.6

Event History

Apr 24, 2026

CVE Published

via MITRE·02:45 PM

Data Sourced

via MITRE·02:45 PM

Description

Data Sourced

via OSV·03:16 PM

DescriptionSeverityAffected Software

Event

via OSV·03:16 PM

Data Sourced

via NVD·03:16 PM

RemedyDescriptionSeverityAffected Software

Apr 26, 2026

Data Sourced

via Microsoft·08:09 AM

DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What is the severity of CVE-2026-31664?

CVE-2026-31664 is classified as a medium-severity vulnerability in the Linux kernel.

How do I fix CVE-2026-31664?

To mitigate CVE-2026-31664, update your Linux kernel to the latest stable version that addresses this vulnerability.

What type of vulnerability is CVE-2026-31664?

CVE-2026-31664 is a clearing trailing padding vulnerability in the xfrm subsystem of the Linux kernel.

Which versions of the Linux kernel are affected by CVE-2026-31664?

CVE-2026-31664 affects multiple versions of the Linux kernel prior to the security patch release addressing this issue.

Is CVE-2026-31664 a remote code execution vulnerability?

CVE-2026-31664 is not classified as a remote code execution vulnerability, but it can impact the security of systems using the affected kernel.

CVE-2026-31664: xfrm: clear trailing padding in build_polexpire()

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2026-31664?

How do I fix CVE-2026-31664?

What type of vulnerability is CVE-2026-31664?

Which versions of the Linux kernel are affected by CVE-2026-31664?

Is CVE-2026-31664 a remote code execution vulnerability?

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