CVE-2026-64570 is a vulnerability in Linux Kernel
Published on August 5, 2026
wifi: mac80211: fix fils_discovery double free on alloc failure
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().
Products Associated with CVE-2026-64570
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Affected Versions
Linux:- Version 3b1c256eb4aedfc71dd97d5951ccff824b41d628 and below e2c55079155a953db669ca1986a985fa286bad95 is affected.
- Version 3b1c256eb4aedfc71dd97d5951ccff824b41d628 and below 5baaa1042f71dd4b8e418f2cdd516808702d229b is affected.
- Version 3b1c256eb4aedfc71dd97d5951ccff824b41d628 and below 1981fba71797ec95e6755fb882cad88899a2a84f is affected.
- Version 3b1c256eb4aedfc71dd97d5951ccff824b41d628 and below 286e52a799fa158bdbd77da1426c4d93f9a6e7ad is affected.
- Version 6.7 is affected.
- Before 6.7 is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.