{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64570","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.797Z","datePublished":"2026-08-05T08:08:07.855Z","dateUpdated":"2026-08-17T04:57:49.594Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:57:49.594Z"},"descriptions":[{"lang":"en","value":"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()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Triggered only via local nl80211 SoftAP config (NL80211_CMD_START_AP/SET_BEACON → ieee80211_set_fils_discovery), not by processing over-the-air WiFi frames or remote packets.\nAC:L - The attacker fully controls the SET_BEACON/STOP_AP sequence and can force the GFP_KERNEL kzalloc failure (e.g. memory pressure/memcg) with an attacker-chosen template size; no race or condition outside attacker influence is required.\nPR:L - START_AP and SET_BEACON use GENL_UNS_ADMIN_PERM (CAP_NET_ADMIN in the wiphy netns user_ns). Per CNA guidance that capability via user namespaces scores Low, not init-namespace root High.\nUI:N - The attacker issues the nl80211 commands to set FILS discovery and later tear down or update the AP; no separate victim action is required.\nS:U - Impact stays inside the host kernel mac80211 heap (local privilege-escalation class) and does not cross a VM, IOMMU, or other separate security authority.\nC:H - After the failed alloc the dangling fils_discovery pointer can be read via ieee80211_get_fils_discovery_tmpl and the object is double-freed; double-free/UAF enables heap reuse and arbitrary kernel memory disclosure.\nI:H - Double-free of the attacker-sized kmalloc FILS template (and subsequent stop_ap/update re-free) is classic heap corruption enabling spray/arbitrary-write and control-flow hijack primitives.\nA:H - The bug is a KASAN-confirmed double-free in rcu_free_sheaf softirq processing and can oops/panic the kernel, fully denying availability."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/cfg.c"],"versions":[{"version":"3b1c256eb4aedfc71dd97d5951ccff824b41d628","lessThan":"e2c55079155a953db669ca1986a985fa286bad95","status":"affected","versionType":"git"},{"version":"3b1c256eb4aedfc71dd97d5951ccff824b41d628","lessThan":"5baaa1042f71dd4b8e418f2cdd516808702d229b","status":"affected","versionType":"git"},{"version":"3b1c256eb4aedfc71dd97d5951ccff824b41d628","lessThan":"1981fba71797ec95e6755fb882cad88899a2a84f","status":"affected","versionType":"git"},{"version":"3b1c256eb4aedfc71dd97d5951ccff824b41d628","lessThan":"286e52a799fa158bdbd77da1426c4d93f9a6e7ad","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/cfg.c"],"versions":[{"version":"6.7","status":"affected"},{"version":"0","lessThan":"6.7","status":"unaffected","versionType":"semver"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e2c55079155a953db669ca1986a985fa286bad95"},{"url":"https://git.kernel.org/stable/c/5baaa1042f71dd4b8e418f2cdd516808702d229b"},{"url":"https://git.kernel.org/stable/c/1981fba71797ec95e6755fb882cad88899a2a84f"},{"url":"https://git.kernel.org/stable/c/286e52a799fa158bdbd77da1426c4d93f9a6e7ad"}],"title":"wifi: mac80211: fix fils_discovery double free on alloc failure","x_generator":{"engine":"bippy-1.2.0"}}}}