CVE-2021-47225

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No\nsurprise - since we dev_close() them with the wiphy mutex held,\nwhich goes back into the netdev notifier in cfg80211 and tries to\nacquire the wiphy mutex there.\n\nTo fix this, we need to do two things:\n 1) prevent changing iftype while AP_VLANs are up, we can't\n easily fix this case since cfg80211 already calls us with\n the wiphy mutex held, but change_interface() is relatively\n rare in drivers anyway, so changing iftype isn't used much\n (and userspace has to fall back to down/change/up anyway)\n 2) pull the dev_close() loop over VLANs out of the wiphy mutex\n section in the normal stop case"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mac80211: corrige el punto muerto en el manejo de AP/VLAN. Syzbot informa que cuando tienes interfaces AP_VLAN activas y cierras la interfaz AP a la que pertenecen, obtenemos un punto muerto. No es de extra\u00f1ar, ya que los dev_close() los usamos con el mutex wiphy retenido, lo que regresa al notificador netdev en cfg80211 e intenta adquirir el mutex wiphy all\u00ed. Para solucionar esto, debemos hacer dos cosas: 1) evitar cambiar iftype mientras las AP_VLAN est\u00e9n activas, no podemos solucionar f\u00e1cilmente este caso ya que cfg80211 ya nos llama con el mutex wiphy retenido, pero change_interface() es relativamente raro en los controladores de todos modos , por lo que cambiar iftype no se usa mucho (y el espacio de usuario tiene que volver a bajar/cambiar/arriba de todos modos) 2) extraiga el bucle dev_close() sobre las VLAN de la secci\u00f3n wiphy mutex en el caso de detenci\u00f3n normal"}], "id": "CVE-2021-47225", "lastModified": "2026-06-17T04:16:56.893", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47225", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-31T18:48:57.781631Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:11.760", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8043903fcb72f545c52e3ec74d6fd82ef79ce7c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d5befb224edbe53056c2c18999d630dafb4a08b9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8043903fcb72f545c52e3ec74d6fd82ef79ce7c5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d5befb224edbe53056c2c18999d630dafb4a08b9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mac80211: fix deadlock in AP/VLAN handling", "id": "2282592", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282592"}, "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-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmac80211: fix deadlock in AP/VLAN handling\nSyzbot reports that when you have AP_VLAN interfaces that are up\nand close the AP interface they belong to, we get a deadlock. No\nsurprise - since we dev_close() them with the wiphy mutex held,\nwhich goes back into the netdev notifier in cfg80211 and tries to\nacquire the wiphy mutex there.\nTo fix this, we need to do two things:\n1) prevent changing iftype while AP_VLANs are up, we can't\neasily fix this case since cfg80211 already calls us with\nthe wiphy mutex held, but change_interface() is relatively\nrare in drivers anyway, so changing iftype isn't used much\n(and userspace has to fall back to down/change/up anyway)\n2) pull the dev_close() loop over VLANs out of the wiphy mutex\nsection in the normal stop case", "A vulnerability was found in the Linux kernel's mac80211 module, where closing an active AP interface while its associated AP_VLAN interfaces are still up can lead to a deadlock. This situation occurs because the system tries to lock a resource that is already held, causing the operation to freeze."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47225", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47225\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47225\nhttps://lore.kernel.org/linux-cve-announce/2024052137-CVE-2021-47225-550b@gregkh/T"], "threat_severity": "Moderate"}

{}