CVE-2026-31406

In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() After cancel_delayed_work_sync() is called from xfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining states via __xfrm_state_delete(), which calls xfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work. The following is a simple race scenario: cpu0 cpu1 cleanup_net() [Round 1] ops_undo_list() xfrm_net_exit() xfrm_nat_keepalive_net_fini() cancel_delayed_work_sync(nat_keepalive_work); xfrm_state_fini() xfrm_state_flush() xfrm_state_delete(x) __xfrm_state_delete(x) xfrm_nat_keepalive_state_updated(x) schedule_delayed_work(nat_keepalive_work); rcu_barrier(); net_complete_free(); net_passive_dec(net); llist_add(&net->defer_free_list, &defer_free_list); cleanup_net() [Round 2] rcu_barrier(); net_complete_free() kmem_cache_free(net_cachep, net); nat_keepalive_work() // on freed net To prevent this, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().

The following products are affected by CVE-2026-31406 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-31406.

URL	Resource
https://git.kernel.org/stable/c/21f2fc49ca6faa393c31da33b8a4e6c41fc84c13
https://git.kernel.org/stable/c/2255ed6adbc3100d2c4a83abd9d0396d04b87792
https://git.kernel.org/stable/c/32d0f44c2f14d60fe8e920e69a28c11051543ec1
https://git.kernel.org/stable/c/daf8e3b253aa760ff9e96c7768a464bc1d6b3c90
https://lore.kernel.org/linux-cve-announce/2026040628-CVE-2026-31406-e2f3@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-31406
https://www.cve.org/CVERecord?id=CVE-2026-31406