Riskcovery

CVE-2026-31664

xfrm: clear trailing padding in build_polexpire()

State
Published
Severity
Not scored
Published
Apr 24, 2026
Updated
Oct 15, 2026
Reserved
Mar 9, 2026

Read the record on cve.org

Description

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

xfrm: clear trailing padding in build_polexpire()

build_expire() clears the trailing padding bytes of struct xfrm_user_expire after setting the hard field via memset_after(), but the analogous function build_polexpire() does not do this for struct xfrm_user_polexpire.

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 XFRMNLGRP_EXPIRE listeners, leaking kernel heap memory contents.

Add the missing memset_after() call, matching build_expire().

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a5127501c8d30b5728791b1e340284ca5c9cc4bdAffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e6f4ffe8596947a595c9544e73a73adcb0568b88Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ac6985903db047eaff54db929e4bf6b06782788eAffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c221ed63a2769a0af8bd849dfe25740048f34ef4Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before eda30846ea54f8ed218468e5480c8305ca645e37Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before b1dfd6b27df35ef4f87825aa5f607378d23ff0f2Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e1af65c669ebb1666c54576614c01a7f9ffcfff6Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 71a98248c63c535eaa4d4c22f099b68d902006d0Affected
LinuxLinux
  • 2.6.12Affected
  • before 2.6.12Not affected
  • 5.10.258 through 5.10.*Not affected
  • 5.15.209 through 5.15.*Not affected
  • 6.1.169 through 6.1.*Not affected
  • 6.6.135 through 6.6.*Not affected
  • 6.12.82 through 6.12.*Not affected
  • 6.18.23 through 6.18.*Not affected
  • 6.19.13 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

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