xfrm: avoid lock inversion in nat keepalive work
In the Linux kernel, the following vulnerability has been resolved: xfrm: avoid lock inversion in nat keepalive work nat_keepalive_work() walks the state table while xfrm_state_walk() holds net->xfrm.xfrm_state_lock. Its callback then acquires x->lock, which conflicts with the delete path taking the same locks in reverse order via xfrm_state_delete() and __xfrm_state_delete(). This creates an AB-BA deadlock that is reported by lockdep when a NAT keepalive worker races with SA deletion. Fix this by splitting the keepalive walk into two phases. First, collect the candidate states while the walk holds xfrm_state_lock and take a reference on each state. Then, after the walk completes, process each collected state and acquire x->lock without nesting it under xfrm_state_lock.
CVE-2026-80845
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80845
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
"lessThan": "ea09210462316e5235a25eccb11ad0708d86615e",
"versionType": "git"
},
{
"status": "affected",
"version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
"lessThan": "5c86c895d1cac81a71ead3005084c6265cf6a7a5",
"versionType": "git"
},
{
"status": "affected",
"version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
"lessThan": "89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d",
"versionType": "git"
},
{
"status": "affected",
"version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
"lessThan": "a9fa05b7a1246797748d15771052639e0d3cabf1",
"versionType": "git"
},
{
"status": "affected",
"version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
"lessThan": "763fe700b7c58ad64fe5202c5638848244dd4127",
"versionType": "git"
}
],
"programFiles": [
"net/xfrm/xfrm_nat_keepalive.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.108",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.49",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.13",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.3",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xfrm/xfrm_nat_keepalive.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80845
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34861 · Revision 1
- Added to Heist Feed
- Publisher date