{"id":"CVE-2026-64570","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-64570","summary":"wifi: mac80211: fix fils_discovery double free on alloc failure","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix fils_discovery double free on alloc failure\n\nieee80211_set_fils_discovery() calls kfree_rcu() on the old template\nbefore allocating the replacement. If the kzalloc() then fails, it\nreturns -ENOMEM while link->u.ap.fils_discovery still points at the\nobject already queued for freeing. A later update or AP teardown\n(ieee80211_stop_ap()) re-queues that same rcu_head; the second free is\ncaught by KASAN when the RCU sheaf is processed in softirq:\n\n  BUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850)\n  Free of addr ffff88800c065280 by task swapper/0/0\n   ...\n   __rcu_free_sheaf_prepare (mm/slub.c:2634 mm/slub.c:2940)\n   rcu_free_sheaf (mm/slub.c:5850)\n   rcu_core (kernel/rcu/tree.c:2617 kernel/rcu/tree.c:2869)\n   handle_softirqs (kernel/softirq.c:622)\n  The buggy address belongs to the cache kmalloc-96 of size 96\n\nQueue the old object for kfree_rcu() only after the new one is published,\nmatching ieee80211_set_probe_resp() and ieee80211_set_s1g_short_beacon().","published":"2026-08-05T08:08:07.855Z","modified":"2026-08-09T03:47:26.697967887Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.101"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1981fba71797ec95e6755fb882cad88899a2a84f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/286e52a799fa158bdbd77da1426c4d93f9a6e7ad"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5baaa1042f71dd4b8e418f2cdd516808702d229b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2c55079155a953db669ca1986a985fa286bad95"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64570.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64570"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-09T03:47:26.697967887Z"}}