CVE-2021-47494

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This trivially\nfixes the bug since we hold one wdev's lock already, and now\nwill hold the lock that protects all lists."}], "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 - The bug is triggered through local nl80211 Generic Netlink (NL80211_CMD_REGISTER_FRAME and socket close \u2192 cfg80211_mlme_unregister_socket), not by processing WiFi frames alone. Adjacent RX only walks lists under the correct per-wdev lock and does not create the cross-wdev writer race.\nAC:L - The attacker controls both sides of the race by registering management frames on multiple wdevs on the same wiphy and concurrently closing another nl80211 socket so unregister_socket mutates a list while update walks it unlocked. Virtual interfaces are creatable via NL80211_CMD_NEW_INTERFACE, so no external condition is required.\nPR:L - NL80211_CMD_REGISTER_FRAME uses GENL_UNS_ADMIN_PERM, which only requires CAP_NET_ADMIN in the socket netns user namespace, not init-namespace root. Per kernel CNA guidance, CAP_NET_ADMIN reachable via user namespaces scores as Low.\nUI:N - Exploitation needs no victim interaction; the attacker issues netlink registrations and closes sockets directly.\nS:U - Impact stays within the host kernel authority (local memory corruption / privilege escalation class). No VM, IOMMU, or sandbox boundary is crossed.\nC:H - cfg80211_mgmt_registrations_update() can read cfg80211_mgmt_registration objects on another wdev while unregister_socket concurrently list_del/kfree them, yielding a use-after-free. Per guidance, UAFs enable arbitrary kernel memory disclosure.\nI:H - Cross-wdev list corruption and UAF of attacker-influenced kmalloc registration objects can be turned into heap reuse and write primitives for control-flow hijacking. Per guidance, UAF/list corruption scores as High integrity impact.\nA:H - The same unlocked list walk versus concurrent mutation causes kernel oops/panic or hangs from corrupted list pointers, so availability impact is High even without full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/cfg80211.h", "net/wireless/core.c", "net/wireless/core.h", "net/wireless/mlme.c"], "versions": [{"version": "6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d", "lessThan": "4c22227e39c7a0b4dab55617ee8d34d171fab8d4", "status": "affected", "versionType": "git"}, {"version": "6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d", "lessThan": "3c897f39b71fe68f90599f6a45b5f7bf5618420e", "status": "affected", "versionType": "git"}, {"version": "6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d", "lessThan": "09b1d5dc6ce1c9151777f6c4e128a59457704c97", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/cfg80211.h", "net/wireless/core.c", "net/wireless/core.h", "net/wireless/mlme.c"], "versions": [{"version": "5.8", "status": "affected"}, {"version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.77", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.16", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "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": "5.8", "versionEndExcluding": "5.10.77"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.14.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4"}, {"url": "https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e"}, {"url": "https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97"}], "title": "cfg80211: fix management registrations locking", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47494", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-22T18:38:36.269063Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:15:18.041Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.605Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97", "tags": ["x_transferred"]}]}]}}

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Adjacent RX only walks lists under the correct per-wdev lock and does not create the cross-wdev writer race.\nAC:L - The attacker controls both sides of the race by registering management frames on multiple wdevs on the same wiphy and concurrently closing another nl80211 socket so unregister_socket mutates a list while update walks it unlocked. Virtual interfaces are creatable via NL80211_CMD_NEW_INTERFACE, so no external condition is required.\nPR:L - NL80211_CMD_REGISTER_FRAME uses GENL_UNS_ADMIN_PERM, which only requires CAP_NET_ADMIN in the socket netns user namespace, not init-namespace root. Per kernel CNA guidance, CAP_NET_ADMIN reachable via user namespaces scores as Low.\nUI:N - Exploitation needs no victim interaction; the attacker issues netlink registrations and closes sockets directly.\nS:U - Impact stays within the host kernel authority (local memory corruption / privilege escalation class). No VM, IOMMU, or sandbox boundary is crossed.\nC:H - cfg80211_mgmt_registrations_update() can read cfg80211_mgmt_registration objects on another wdev while unregister_socket concurrently list_del/kfree them, yielding a use-after-free. Per guidance, UAFs enable arbitrary kernel memory disclosure.\nI:H - Cross-wdev list corruption and UAF of attacker-influenced kmalloc registration objects can be turned into heap reuse and write primitives for control-flow hijacking. 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This trivially\nfixes the bug since we hold one wdev's lock already, and now\nwill hold the lock that protects all lists."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: cfg80211: corrige el bloqueo de registros de administraci\u00f3n. El bloqueo de registros de administraci\u00f3n estaba roto, la lista estaba bloqueada para cada wdev, pero cfg80211_mgmt_registrations_update() la repiti\u00f3 sin mantener todos los spinlocks correctos, lo que provoc\u00f3 corrupci\u00f3n en la lista. En lugar de intentar solucionarlo con un bloqueo detallado, simplemente mueva el bloqueo a wiphy/rdev (a\u00fan necesitamos la lista en cada wdev), ya necesitamos mantener presionado el bloqueo wdev para cambiarlo, por lo que no hay contenci\u00f3n en el bloqueo. En todo caso. Esto soluciona trivialmente el error ya que ya tenemos un bloqueo de wdev y ahora mantendremos el bloqueo que protege todas las listas."}], "id": "CVE-2021-47494", "lastModified": "2026-08-04T10:17:05.763", "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"}, {"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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47494", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-22T18:38:36.269063Z", "version": "2.0.3"}}]}, "published": "2024-05-22T09:15:11.270", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: cfg80211: fix management registrations locking", "id": "2282921", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282921"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncfg80211: fix management registrations locking\nThe management registrations locking was broken, the list was\nlocked for each wdev, but cfg80211_mgmt_registrations_update()\niterated it without holding all the correct spinlocks, causing\nlist corruption.\nRather than trying to fix it with fine-grained locking, just\nmove the lock to the wiphy/rdev (still need the list on each\nwdev), we already need to hold the wdev lock to change it, so\nthere's no contention on the lock in any case. This trivially\nfixes the bug since we hold one wdev's lock already, and now\nwill hold the lock that protects all lists.", "A vulnerability was found in the Linux kernel's `cfg80211` module, where improper locking of management registrations could lead to list corruption. This issue occurred because the `cfg80211_mgmt_registrations_update()` function iterated over a list without holding the correct spinlocks."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2021-47494", "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": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47494\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47494\nhttps://lore.kernel.org/linux-cve-announce/2024052241-CVE-2021-47494-d0d7@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:44:57.360620+00:00", "updated": "2025-07-12T22:44:57.360678+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}