CVE-2026-31516 (GCVE-0-2026-31516)
Vulnerability from cvelistv5
Published
2026-04-22 13:54
Modified
2026-04-27 14:03
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
xfrm: prevent policy_hthresh.work from racing with netns teardown
A XFRM_MSG_NEWSPDINFO request can queue the per-net work item
policy_hthresh.work onto the system workqueue.
The queued callback, xfrm_hash_rebuild(), retrieves the enclosing
struct net via container_of(). If the net namespace is torn down
before that work runs, the associated struct net may already have
been freed, and xfrm_hash_rebuild() may then dereference stale memory.
xfrm_policy_fini() already flushes policy_hash_work during teardown,
but it does not synchronize policy_hthresh.work.
Synchronize policy_hthresh.work in xfrm_policy_fini() as well, so the
queued work cannot outlive the net namespace teardown and access a
freed struct net.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/xfrm/xfrm_policy.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "56ea2257b83ee29a543f158159e3d1abc1e3e4fe",
"status": "affected",
"version": "880a6fab8f6ba5b5abe59ea68533202ddea1012c",
"versionType": "git"
},
{
"lessThan": "8854e9367465d784046362698731c1111e3b39b8",
"status": "affected",
"version": "880a6fab8f6ba5b5abe59ea68533202ddea1012c",
"versionType": "git"
},
{
"lessThan": "4e2e77843fef473ef47e322d52436d8308582a96",
"status": "affected",
"version": "880a6fab8f6ba5b5abe59ea68533202ddea1012c",
"versionType": "git"
},
{
"lessThan": "29fe3a61bcdce398ee3955101c39f89c01a8a77e",
"status": "affected",
"version": "880a6fab8f6ba5b5abe59ea68533202ddea1012c",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/xfrm/xfrm_policy.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.18"
},
{
"lessThan": "3.18",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.80",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.21",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.11",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: prevent policy_hthresh.work from racing with netns teardown\n\nA XFRM_MSG_NEWSPDINFO request can queue the per-net work item\npolicy_hthresh.work onto the system workqueue.\n\nThe queued callback, xfrm_hash_rebuild(), retrieves the enclosing\nstruct net via container_of(). If the net namespace is torn down\nbefore that work runs, the associated struct net may already have\nbeen freed, and xfrm_hash_rebuild() may then dereference stale memory.\n\nxfrm_policy_fini() already flushes policy_hash_work during teardown,\nbut it does not synchronize policy_hthresh.work.\n\nSynchronize policy_hthresh.work in xfrm_policy_fini() as well, so the\nqueued work cannot outlive the net namespace teardown and access a\nfreed struct net."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-27T14:03:50.466Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/56ea2257b83ee29a543f158159e3d1abc1e3e4fe"
},
{
"url": "https://git.kernel.org/stable/c/8854e9367465d784046362698731c1111e3b39b8"
},
{
"url": "https://git.kernel.org/stable/c/4e2e77843fef473ef47e322d52436d8308582a96"
},
{
"url": "https://git.kernel.org/stable/c/29fe3a61bcdce398ee3955101c39f89c01a8a77e"
}
],
"title": "xfrm: prevent policy_hthresh.work from racing with netns teardown",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31516",
"datePublished": "2026-04-22T13:54:32.851Z",
"dateReserved": "2026-03-09T15:48:24.107Z",
"dateUpdated": "2026-04-27T14:03:50.466Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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