GHSA-5FVV-6WPC-9MR7
Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-10-15 03:35In 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().
{
"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": "MODERATE"
},
"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": "2026-10-15T03:35:43Z",
"published": "2026-04-24T15:32:37Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31664"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/71a98248c63c535eaa4d4c22f099b68d902006d0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a5127501c8d30b5728791b1e340284ca5c9cc4bd"
},
{
"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/e6f4ffe8596947a595c9544e73a73adcb0568b88"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eda30846ea54f8ed218468e5480c8305ca645e37"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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