EUVD-2026-24900
GHSA-g967-c7qh-8q49
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
8DescriptionNVD
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.
AnalysisAI
Use-after-free in Linux kernel XFRM subsystem allows local authenticated attackers to achieve arbitrary code execution with high privileges. The vulnerability arises when XFRM policy hash threshold work items (policy_hthresh.work) outlive network namespace teardown, dereferencing freed struct net memory in xfrm_hash_rebuild(). …
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RemediationAI
Within 24 hours: inventory all systems running Linux kernels versions 6.12.x through 6.12.79, 6.18.x through 6.18.20, 6.19.x through 6.19.10, or 7.0.x versions prior to patched releases. Within 7 days: prioritize patching systems handling sensitive network security functions or multi-tenant environments where local user access is permitted; apply kernel updates to 6.12.80, 6.18.21, 6.19.11, 7.0 (or later stable branches). …
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