CVE-2026-64568

Status: UPDATED  |  Advisory ID: CVE-2026-64568

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

wifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure

ieee80211_set_unsol_bcast_probe_resp() calls kfree_rcu() on the old

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

it returns -ENOMEM while link->u.ap.unsol_bcast_probe_resp still points

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

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 ffff88800d06f300 by task exploit/145

...

__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-128 of size 128

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