CVE-2026-31516

About vulnerability

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. A flaw was found in the Linux kernel’s XFRM (IP eXtensible FRamework) subsystem. A race condition can occur during the teardown of a network namespace, where a work item attempts to access memory that has already been freed. This can lead to a use-after-free vulnerability, potentially causing system instability or denial of service.

Live-patch status from KernelCare for each operating system.