CVE-2026-74661

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74661", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.924Z", "datePublished": "2026-08-22T15:32:34.414Z", "dateUpdated": "2026-08-25T05:41:15.528Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:41:15.528Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: fix netdev use-after-free in beacon worker\n\nmac802154_beacon_worker() reads local->beacon_req under RCU and derives\nthe sub-interface from the request, but then drops the RCU read lock and\ncontinues to use both sdata and the embedded wpan_dev.\n\nmac802154_stop_beacons_locked() cancels only pending beacon work, clears\nlocal->beacon_req and frees the request. A beacon worker that is already\nrunning can therefore continue after interface teardown and dereference\nthe freed netdev private area.\n\nThe scan worker already pins the netdev before leaving RCU. Apply the\nsame lifetime rule to the beacon worker: take a netdev reference while\nthe request is still protected by RCU, and release it on all paths that\ncontinue after the reference is acquired."}], "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 - Exploitation requires local nl802154 generic-netlink syscalls (NL802154_CMD_SEND_BEACONS/STOP_BEACONS) or closing the wpan netdev; the UAF is in beacon workqueue teardown, not in remote 802.15.4 frame parsing, matching netlink-local kernel guidance.\nAC:L - An attacker with CAP_NET_ADMIN controls both sides of the race by starting beaconing then immediately issuing STOP_BEACONS or DEL_INTERFACE while mac802154_transmit_beacon() keeps the worker running; cancel_delayed_work() does not stop in-flight work, making the UAF reliably triggerable.\nPR:L - Starting/stopping beaconing and deleting wpan interfaces require GENL_ADMIN_PERM (netlink_capable CAP_NET_ADMIN); this is reachable from an unprivileged UID via a user namespace (unshare -Urn), not init-namespace root, consistent with mac802154_hwsim and nl802154 gating.\nUI:N - No victim interaction is required; the attacker triggers the race entirely through their own netlink and interface lifecycle operations without needing another user to click, pair, or mount anything.\nS:U - The use-after-free corrupts kernel heap memory (netdev private ieee802154_sub_if_data) within the same kernel security boundary; it does not cross VM, container, or IOMMU isolation boundaries on its own.\nC:H - Use-after-free of the netdev private area (ieee802154_sub_if_data) after interface teardown allows reading freed slab memory; UAF primitives commonly enable arbitrary kernel memory disclosure via heap grooming.\nI:H - The dangling sdata/wpan_dev pointers enable heap-based memory corruption; UAF of netdev private structures is exploitable for control-flow hijacking and arbitrary kernel write primitives via slab reuse.\nA:H - Concurrent interface teardown while the beacon worker dereferences freed netdev private memory causes kernel oops/panic (KASAN slab-use-after-free), and successful exploitation can crash or hang the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mac802154/scan.c"], "versions": [{"version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "lessThan": "fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517", "status": "affected", "versionType": "git"}, {"version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "lessThan": "e5fb0e03bc7f45508c182a427357bf6b389a9033", "status": "affected", "versionType": "git"}, {"version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "lessThan": "e6cd416a899edc912b428c4ba399bd73f516cb31", "status": "affected", "versionType": "git"}, {"version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "lessThan": "9d067e581597c462c51fee8a30b51bc48a68c4e1", "status": "affected", "versionType": "git"}, {"version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "lessThan": "5f26a690e8efa54315e4922368daf54e0b8f5515", "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/mac802154/scan.c"], "versions": [{"version": "6.3", "status": "affected"}, {"version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "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": "6.3", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517"}, {"url": "https://git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033"}, {"url": "https://git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31"}, {"url": "https://git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1"}, {"url": "https://git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515"}], "title": "mac802154: fix netdev use-after-free in beacon worker", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/mac802154/scan.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517", "status": "affected", "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "versionType": "git"}, {"lessThan": "e5fb0e03bc7f45508c182a427357bf6b389a9033", "status": "affected", "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "versionType": "git"}, {"lessThan": "e6cd416a899edc912b428c4ba399bd73f516cb31", "status": "affected", "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "versionType": "git"}, {"lessThan": "9d067e581597c462c51fee8a30b51bc48a68c4e1", "status": "affected", "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "versionType": "git"}, {"lessThan": "5f26a690e8efa54315e4922368daf54e0b8f5515", "status": "affected", "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/mac802154/scan.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.3"}, {"lessThan": "6.3", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "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\nmac802154: fix netdev use-after-free in beacon worker\n\nmac802154_beacon_worker() reads local->beacon_req under RCU and derives\nthe sub-interface from the request, but then drops the RCU read lock and\ncontinues to use both sdata and the embedded wpan_dev.\n\nmac802154_stop_beacons_locked() cancels only pending beacon work, clears\nlocal->beacon_req and frees the request. A beacon worker that is already\nrunning can therefore continue after interface teardown and dereference\nthe freed netdev private area.\n\nThe scan worker already pins the netdev before leaving RCU. Apply the\nsame lifetime rule to the beacon worker: take a netdev reference while\nthe request is still protected by RCU, and release it on all paths that\ncontinue after the reference is acquired."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmac802154: corregir uso despu\u00e9s de liberaci\u00f3n de netdev en el trabajador de balizas\n\nmac802154_beacon_worker() lee local -> beacon_req bajo RCU y deriva la subinterfaz de la solicitud, pero luego suelta el bloqueo de lectura RCU y contin\u00faa usando tanto sdata como el wpan_dev incrustado.\n\nmac802154_stop_beacons_locked() cancela solo el trabajo de balizas pendiente, borra local -> beacon_req y libera la solicitud. Un trabajador de balizas que ya est\u00e1 en ejecuci\u00f3n puede, por lo tanto, continuar despu\u00e9s del desmontaje de la interfaz y desreferenciar el \u00e1rea privada de netdev liberada.\n\nEl trabajador de escaneo ya fija el netdev antes de salir de RCU. Aplicar la misma regla de vida \u00fatil al trabajador de balizas: tomar una referencia de netdev mientras la solicitud a\u00fan est\u00e1 protegida por RCU, y liberarla en todas las rutas que contin\u00faan despu\u00e9s de que se adquiere la referencia."}], "id": "CVE-2026-74661", "lastModified": "2026-10-14T13:10:00.187", "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": "2026-08-22T16:16:39.883", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: mac802154: fix netdev use-after-free in beacon worker", "id": "2521388", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521388"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the mac802154 component of the Linux kernel. This use-after-free vulnerability allows a local attacker to potentially cause a system crash (denial of service) or execute arbitrary code. The issue arises when the beacon worker attempts to access memory that has already been freed during network interface teardown."], "name": "CVE-2026-74661", "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74661\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74661\nhttps://lore.kernel.org/linux-cve-announce/2026082227-CVE-2026-74661-6885@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3accf4762734a69ebd03cba989249c78ac7dfc7e,fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3accf4762734a69ebd03cba989249c78ac7dfc7e,e5fb0e03bc7f45508c182a427357bf6b389a9033)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3accf4762734a69ebd03cba989249c78ac7dfc7e,e6cd416a899edc912b428c4ba399bd73f516cb31)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3accf4762734a69ebd03cba989249c78ac7dfc7e,9d067e581597c462c51fee8a30b51bc48a68c4e1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3accf4762734a69ebd03cba989249c78ac7dfc7e,5f26a690e8efa54315e4922368daf54e0b8f5515)"}}], "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": "6.3"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.3)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "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": "2026-08-22T18:45:04.674005+00:00", "updated": "2026-08-25T08:30:04.571196+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}