CVE-2026-64570

Technical Description

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 i

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References