GHSA-5FVV-6WPC-9MR7

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-24 15:32
VLAI?
Details

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().

Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-31664"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:46Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: clear trailing padding in build_polexpire()\n\nbuild_expire() clears the trailing padding bytes of struct\nxfrm_user_expire after setting the hard field via memset_after(),\nbut the analogous function build_polexpire() does not do this for\nstruct xfrm_user_polexpire.\n\nThe padding bytes after the __u8 hard field are left\nuninitialized from the heap allocation, and are then sent to\nuserspace via netlink multicast to XFRMNLGRP_EXPIRE listeners,\nleaking kernel heap memory contents.\n\nAdd the missing memset_after() call, matching build_expire().",
  "id": "GHSA-5fvv-6wpc-9mr7",
  "modified": "2026-04-24T15:32:37Z",
  "published": "2026-04-24T15:32:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31664"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71a98248c63c535eaa4d4c22f099b68d902006d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac6985903db047eaff54db929e4bf6b06782788e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1dfd6b27df35ef4f87825aa5f607378d23ff0f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c221ed63a2769a0af8bd849dfe25740048f34ef4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1af65c669ebb1666c54576614c01a7f9ffcfff6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eda30846ea54f8ed218468e5480c8305ca645e37"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.