CVE-2026-31516xfrm: prevent policy_hthresh.work from racing with netns teardown
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 880a6fab8f6ba5b5abe59ea68533202ddea1012c builds before 56ea2257b83ee29a543f158159e3d1abc1e3e4fe; from 880a6fab8f6ba5b5abe59ea68533202ddea1012c before 8854e9367465d784046362698731c1111e3b39b8; 880a6fab8f6ba5b5abe59ea68533202ddea1012c builds before 4e2e77843fef473ef47e322d52436d8308582a96; 880a6fab8f6ba5b5abe59ea68533202ddea1012c builds before 29fe3a61bcdce398ee3955101c39f89c01a8a77e | CNA record |
linux linux_kernel linux:linux_kernel | from 3.18.1 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 3.18; 7.0; 7.0; 7.0; 7.0; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/56ea2257b83ee29a543f158159e3d1abc1e3e4fepatch
- https://git.kernel.org/stable/c/8854e9367465d784046362698731c1111e3b39b8patch
- https://git.kernel.org/stable/c/4e2e77843fef473ef47e322d52436d8308582a96patch
- https://git.kernel.org/stable/c/29fe3a61bcdce398ee3955101c39f89c01a8a77epatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.