CVE-2026-64568

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64568", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.797Z", "datePublished": "2026-08-05T08:08:06.625Z", "dateUpdated": "2026-08-17T04:57:46.839Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:57:46.839Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure\n\nieee80211_set_unsol_bcast_probe_resp() calls kfree_rcu() on the old\ntemplate before allocating the replacement. If the kzalloc() then fails,\nit returns -ENOMEM while link->u.ap.unsol_bcast_probe_resp still points\nat the object already queued for freeing. A later update or AP teardown\nre-queues that same rcu_head; the second free is caught by KASAN when the\nRCU sheaf is processed in softirq:\n\n BUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850)\n Free of addr ffff88800d06f300 by task exploit/145\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-128 of size 128\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/CHANNEL_SWITCH/COLOR_CHANGE \u2192 ieee80211_set_unsol_bcast_probe_resp), 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 the unsolicited broadcast probe response template 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 unsol_bcast_probe_resp pointer can be read via ieee80211_get_unsol_bcast_probe_resp_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 unsol_bcast_probe_resp 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 (task exploit/145) 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": "ca27a81cd77b698e5eb586a011bee6800c7ee4bd", "status": "affected", "versionType": "git"}, {"version": "3b1c256eb4aedfc71dd97d5951ccff824b41d628", "lessThan": "d62b55b7c7dc62887d7fd5648fb38f0bfaef53ae", "status": "affected", "versionType": "git"}, {"version": "3b1c256eb4aedfc71dd97d5951ccff824b41d628", "lessThan": "0ace76e410d7f7d813b605825a3e593a79c3958f", "status": "affected", "versionType": "git"}, {"version": "3b1c256eb4aedfc71dd97d5951ccff824b41d628", "lessThan": "1d067abcd37062426c59ec73dbc4e87a63f33fea", "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/ca27a81cd77b698e5eb586a011bee6800c7ee4bd"}, {"url": "https://git.kernel.org/stable/c/d62b55b7c7dc62887d7fd5648fb38f0bfaef53ae"}, {"url": "https://git.kernel.org/stable/c/0ace76e410d7f7d813b605825a3e593a79c3958f"}, {"url": "https://git.kernel.org/stable/c/1d067abcd37062426c59ec73dbc4e87a63f33fea"}], "title": "wifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/mac80211/cfg.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ca27a81cd77b698e5eb586a011bee6800c7ee4bd", "status": "affected", "version": "3b1c256eb4aedfc71dd97d5951ccff824b41d628", "versionType": "git"}, {"lessThan": "d62b55b7c7dc62887d7fd5648fb38f0bfaef53ae", "status": "affected", "version": "3b1c256eb4aedfc71dd97d5951ccff824b41d628", "versionType": "git"}, {"lessThan": "0ace76e410d7f7d813b605825a3e593a79c3958f", "status": "affected", "version": "3b1c256eb4aedfc71dd97d5951ccff824b41d628", "versionType": "git"}, {"lessThan": "1d067abcd37062426c59ec73dbc4e87a63f33fea", "status": "affected", "version": "3b1c256eb4aedfc71dd97d5951ccff824b41d628", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/mac80211/cfg.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure\n\nieee80211_set_unsol_bcast_probe_resp() calls kfree_rcu() on the old\ntemplate before allocating the replacement. If the kzalloc() then fails,\nit returns -ENOMEM while link->u.ap.unsol_bcast_probe_resp still points\nat the object already queued for freeing. A later update or AP teardown\nre-queues that same rcu_head; the second free is caught by KASAN when the\nRCU sheaf is processed in softirq:\n\n BUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850)\n Free of addr ffff88800d06f300 by task exploit/145\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-128 of size 128\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()."}], "id": "CVE-2026-64568", "lastModified": "2026-11-03T18:15:39.353", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-05T08:16:36.423", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0ace76e410d7f7d813b605825a3e593a79c3958f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1d067abcd37062426c59ec73dbc4e87a63f33fea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca27a81cd77b698e5eb586a011bee6800c7ee4bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d62b55b7c7dc62887d7fd5648fb38f0bfaef53ae"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3b1c256eb4aedfc71dd97d5951ccff824b41d628,ca27a81cd77b698e5eb586a011bee6800c7ee4bd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3b1c256eb4aedfc71dd97d5951ccff824b41d628,d62b55b7c7dc62887d7fd5648fb38f0bfaef53ae)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3b1c256eb4aedfc71dd97d5951ccff824b41d628,0ace76e410d7f7d813b605825a3e593a79c3958f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3b1c256eb4aedfc71dd97d5951ccff824b41d628,1d067abcd37062426c59ec73dbc4e87a63f33fea)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-05T09:30:11.604325+00:00", "updated": "2026-08-08T18:30:03.343455+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-415"]}