Answer in brief
CVE-2026-31516 records a High severity (CVSS 7.8) vulnerability in xfrm: prevent policy_hthresh.work from racing with netns teardown. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=880a6fab8f6ba5b5abe59ea68533202ddea1012c <56ea2257b83ee29a543f158159e3d1abc1e3e4fe || >=880a6fab8f6ba5b5abe59ea68533202ddea1012c <8854e9367465d784046362698731c1111e3b39b8 || >=880a6fab8f6ba5b5abe59ea68533202ddea1012c <4e2e77843fef473ef47e322d52436d8308582a96 || >=880a6fab8f6ba5b5abe59ea68533202ddea1012c <29fe3a61bcdce398ee3955101c39f89c01a8a77e | 56ea2257b83ee29a543f158159e3d1abc1e3e4fe, 8854e9367465d784046362698731c1111e3b39b8, 4e2e77843fef473ef47e322d52436d8308582a96, 29fe3a61bcdce398ee3955101c39f89c01a8a77e |
| Linux/Linuxgeneric | 3.18 | Not reported |
Published upstream
Apr 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
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.
Quoted source text, attributed separately from HOL analysis.