CVE-2026-64570

Status: UPDATED  |  Advisory ID: CVE-2026-64570

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: fix fils_discovery double free on alloc failure

ieee80211_set_fils_discovery() calls kfree_rcu() on the old template

before allocating the replacement. If the kzalloc() then fails, it

returns -ENOMEM while link->u.ap.fils_discovery still points at the

object already queued for freeing. A later update or AP teardown

(ieee80211_stop_ap()) re-queues that same rcu_head; the second free is

caught by KASAN when the RCU sheaf is processed in softirq:

BUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850)

Free of addr ffff88800c065280 by task swapper/0/0

...

__rcu_free_sheaf_prepare (mm/slub.c:2634 mm/slub.c:2940)

rcu_free_sheaf (mm/slub.c:5850)

rcu_core (kernel/rcu/tree.c:2617 kernel/rcu/tree.c:2869)

handle_softirqs (kernel/softirq.c:622)

The buggy address belongs to the cache kmalloc-96 of size 96

Queue the old object for kfree_rcu() only after the new one is published,

matching ieee80211_set_probe_resp() and ieee80211_set_s1g_short_beacon(). (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References