{"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": "2026-08-08T15:13:10.596Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-08T15:13:10.596Z"}, "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 \u2192 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-rc4", "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-rc4"}]}]}], "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"}}}}

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{}

{"bugzilla": {"description": "kernel: wifi: mac80211: fix fils_discovery double free on alloc failure", "id": "2511421", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511421"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1341", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nwifi: mac80211: fix fils_discovery double free on alloc failure\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:\nBUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850)\nFree of addr ffff88800c065280 by task swapper/0/0\n...\n__rcu_free_sheaf_prepare (mm/slub.c:2634 mm/slub.c:2940)\nrcu_free_sheaf (mm/slub.c:5850)\nrcu_core (kernel/rcu/tree.c:2617 kernel/rcu/tree.c:2869)\nhandle_softirqs (kernel/softirq.c:622)\nThe buggy address belongs to the cache kmalloc-96 of size 96\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().", "A flaw was found in the Linux kernel's Wi-Fi subsystem (mac80211). A double-free vulnerability exists in the handling of FILS (Fast Initial Link Setup) Discovery frames. When an allocation failure occurs during the update of a FILS Discovery template, the same memory region can be freed twice. This can lead to memory corruption, potentially causing a system crash and a Denial of Service (DoS)."], "name": "CVE-2026-64570", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64570\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64570\nhttps://lore.kernel.org/linux-cve-announce/2026080559-CVE-2026-64570-8771@gregkh/T"], "threat_severity": "Moderate"}