CVE-2026-31548

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If the interface is concurrently torn down\nbefore that work runs, cfg80211_pmsr_wdev_down() calls\ncfg80211_pmsr_process_abort() directly. However, the already-\nscheduled pmsr_free_wk work item remains pending and may run\nafter the interface has been removed from the driver. This\ncould cause the driver's abort_pmsr callback to operate on a\ntorn-down interface, leading to undefined behavior and\npotential crashes.\n\nCancel pmsr_free_wk synchronously in cfg80211_pmsr_wdev_down()\nbefore calling cfg80211_pmsr_process_abort(). This ensures any\npending or in-progress work is drained before interface teardown\nproceeds, preventing the work from invoking the driver abort\ncallback after the interface is gone."}], "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 vulnerable path is reached through local nl80211 generic-netlink operations for `NL80211_CMD_PEER_MEASUREMENT_START` and netlink socket teardown/device teardown, not by remote WiFi frames alone.\nAC:L - The attacker can create the PMSR request, close the originating netlink socket to schedule `pmsr_free_wk`, and trigger interface teardown concurrently; this is an attacker-controlled race.\nPR:L - The start path is gated by `GENL_UNS_ADMIN_PERM`, requiring `CAP_NET_ADMIN` in the relevant network namespace. Under the kernel guidance, namespace-reachable `CAP_NET_ADMIN` is Low privileges rather than High.\nUI:N - No victim action is required once the attacker has local access and the needed netlink privilege; the attacker controls the request, socket close, and teardown sequence.\nS:U - The impact remains within the kernel/driver security authority and does not cross a VM, IOMMU, or separate sandbox boundary.\nC:H - The stale pending work can operate on a torn-down wireless interface and driver state, a use-after-teardown/use-after-free style condition. In the highest defensible case, freed or invalid kernel objects may be reused to gain memory disclosure primitives.\nI:H - The same stale work and driver callback path can dereference and act on invalid or reallocated kernel/driver objects. Treating this as exploitable memory corruption makes arbitrary write or control-flow impact defensible.\nA:H - The commit explicitly describes undefined behavior and potential crashes from invoking the abort callback after interface teardown. A kernel crash or oops is High availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/wireless/pmsr.c"], "versions": [{"version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "28d3551f8d8cb3aec7497894d94150fe84d20e5e", "status": "affected", "versionType": "git"}, {"version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "37e776e2e0a523731e2470dce6d563f0e8632a40", "status": "affected", "versionType": "git"}, {"version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa", "status": "affected", "versionType": "git"}, {"version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf", "status": "affected", "versionType": "git"}, {"version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "72b7ea786b8e570ae11149e9089859a4a8634a13", "status": "affected", "versionType": "git"}, {"version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09", "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/wireless/pmsr.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "5.0", "versionEndExcluding": "6.1.167"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.19.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/28d3551f8d8cb3aec7497894d94150fe84d20e5e"}, {"url": "https://git.kernel.org/stable/c/37e776e2e0a523731e2470dce6d563f0e8632a40"}, {"url": "https://git.kernel.org/stable/c/d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa"}, {"url": "https://git.kernel.org/stable/c/a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf"}, {"url": "https://git.kernel.org/stable/c/72b7ea786b8e570ae11149e9089859a4a8634a13"}, {"url": "https://git.kernel.org/stable/c/6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09"}], "title": "wifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31548", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:10:48.891822Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T18:55:58.636Z"}}]}}

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Under the kernel guidance, namespace-reachable `CAP_NET_ADMIN` is Low privileges rather than High.\nUI:N - No victim action is required once the attacker has local access and the needed netlink privilege; the attacker controls the request, socket close, and teardown sequence.\nS:U - The impact remains within the kernel/driver security authority and does not cross a VM, IOMMU, or separate sandbox boundary.\nC:H - The stale pending work can operate on a torn-down wireless interface and driver state, a use-after-teardown/use-after-free style condition. In the highest defensible case, freed or invalid kernel objects may be reused to gain memory disclosure primitives.\nI:H - The same stale work and driver callback path can dereference and act on invalid or reallocated kernel/driver objects. Treating this as exploitable memory corruption makes arbitrary write or control-flow impact defensible.\nA:H - The commit explicitly describes undefined behavior and potential crashes from invoking the abort callback after interface teardown. A kernel crash or oops is High availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "28d3551f8d8cb3aec7497894d94150fe84d20e5e", "versionType": "git"}, {"status": "affected", "version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "37e776e2e0a523731e2470dce6d563f0e8632a40", "versionType": "git"}, {"status": "affected", "version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa", "versionType": "git"}, {"status": "affected", "version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf", "versionType": "git"}, {"status": "affected", "version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "72b7ea786b8e570ae11149e9089859a4a8634a13", "versionType": "git"}, {"status": "affected", "version": "9bb7e0f24e7e7d00daa1219b14539e2e602649b2", "lessThan": "6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09", "versionType": "git"}], "programFiles": ["net/wireless/pmsr.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"status": "unaffected", "version": "0", "lessThan": "5.0", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.167", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.130", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.78", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.20", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.10", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/wireless/pmsr.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/28d3551f8d8cb3aec7497894d94150fe84d20e5e"}, {"url": "https://git.kernel.org/stable/c/37e776e2e0a523731e2470dce6d563f0e8632a40"}, {"url": "https://git.kernel.org/stable/c/d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa"}, {"url": "https://git.kernel.org/stable/c/a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf"}, {"url": "https://git.kernel.org/stable/c/72b7ea786b8e570ae11149e9089859a4a8634a13"}, {"url": "https://git.kernel.org/stable/c/6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down\n\nWhen the nl80211 socket that originated a PMSR request is\nclosed, cfg80211_release_pmsr() sets the request's nl_portid\nto zero and schedules pmsr_free_wk to process the abort\nasynchronously. If the interface is concurrently torn down\nbefore that work runs, cfg80211_pmsr_wdev_down() calls\ncfg80211_pmsr_process_abort() directly. However, the already-\nscheduled pmsr_free_wk work item remains pending and may run\nafter the interface has been removed from the driver. This\ncould cause the driver's abort_pmsr callback to operate on a\ntorn-down interface, leading to undefined behavior and\npotential crashes.\n\nCancel pmsr_free_wk synchronously in cfg80211_pmsr_wdev_down()\nbefore calling cfg80211_pmsr_process_abort(). This ensures any\npending or in-progress work is drained before interface teardown\nproceeds, preventing the work from invoking the driver abort\ncallback after the interface is gone."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.167", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.130", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.78", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.20", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.10", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "5.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:23:25.445Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31548", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:55:58.636Z", "dateReserved": "2026-03-09T15:48:24.114Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-04-24T14:33:16.021Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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If the interface is concurrently torn down\nbefore that work runs, cfg80211_pmsr_wdev_down() calls\ncfg80211_pmsr_process_abort() directly. However, the already-\nscheduled pmsr_free_wk work item remains pending and may run\nafter the interface has been removed from the driver. This\ncould cause the driver's abort_pmsr callback to operate on a\ntorn-down interface, leading to undefined behavior and\npotential crashes.\n\nCancel pmsr_free_wk synchronously in cfg80211_pmsr_wdev_down()\nbefore calling cfg80211_pmsr_process_abort(). This ensures any\npending or in-progress work is drained before interface teardown\nproceeds, preventing the work from invoking the driver abort\ncallback after the interface is gone."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nwifi: cfg80211: cancelar pmsr_free_wk en cfg80211_pmsr_wdev_down\n\nCuando el socket nl80211 que origin\u00f3 una solicitud PMSR se cierra, cfg80211_release_pmsr() establece el nl_portid de la solicitud a cero y programa pmsr_free_wk para procesar la anulaci\u00f3n de forma as\u00edncrona. Si la interfaz se desactiva concurrentemente antes de que se ejecute ese trabajo, cfg80211_pmsr_wdev_down() llama a cfg80211_pmsr_process_abort() directamente. Sin embargo, el elemento de trabajo pmsr_free_wk ya programado permanece pendiente y puede ejecutarse despu\u00e9s de que la interfaz haya sido eliminada del controlador. Esto podr\u00eda causar que la devoluci\u00f3n de llamada abort_pmsr del controlador opere en una interfaz desactivada, lo que lleva a un comportamiento indefinido y posibles fallos.\n\nCancelar pmsr_free_wk de forma s\u00edncrona en cfg80211_pmsr_wdev_down() antes de llamar a cfg80211_pmsr_process_abort(). Esto asegura que cualquier trabajo pendiente o en curso se agote antes de que proceda la desactivaci\u00f3n de la interfaz, evitando que el trabajo invoque la devoluci\u00f3n de llamada de anulaci\u00f3n del controlador despu\u00e9s de que la interfaz haya desaparecido."}], "id": "CVE-2026-31548", "lastModified": "2026-11-11T23:10:00.263", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31548", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:10:48.891822Z", "version": "2.0.3"}}]}, "published": "2026-04-24T15:16:28.930", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28d3551f8d8cb3aec7497894d94150fe84d20e5e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/37e776e2e0a523731e2470dce6d563f0e8632a40"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/72b7ea786b8e570ae11149e9089859a4a8634a13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: wifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down", "id": "2461522", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461522"}, "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-366", "details": ["A flaw was found in the Linux kernel's `cfg80211` Wi-Fi subsystem. When a Wi-Fi interface is shut down, a scheduled work item (`pmsr_free_wk`) may not be properly cancelled. This can lead to the work item attempting to operate on an already removed interface, resulting in undefined behavior and potential system crashes, causing a Denial of Service (DoS)."], "name": "CVE-2026-31548", "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": "Not affected", "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": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31548\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31548\nhttps://lore.kernel.org/linux-cve-announce/2026042425-CVE-2026-31548-3d88@gregkh/T"], "threat_severity": "Moderate"}

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