CVE-2026-31473

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Extend that serialization to REQBUFS, and also take\nthe same mutex in media_request_ioctl_reinit() so REINIT is in the\nsame exclusion domain.\n\nThis keeps request cleanup and queue cancellation from running in\nparallel for request-capable devices."}], "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 paths are reached through local `ioctl()` calls on media/video device file descriptors: `MEDIA_REQUEST_IOC_REINIT` on a request fd and `VIDIOC_REQBUFS(0)` on a V4L2 video fd. The affected code is not reachable directly from network packets or adjacent/physical protocol input.\nAC:L - This is a race, but an attacker controls both racing operations by issuing concurrent ioctls from local threads or processes. No condition beyond access to a request-capable media device is required.\nPR:L - The kernel path has no capability or admin check; the attacker only needs ordinary local ability to open the relevant `/dev/media*` and `/dev/video*` nodes. This is basic local privilege rather than real root/admin privilege.\nUI:N - Once the attacker can run local code and open the device nodes, exploitation is driven entirely by attacker-issued ioctls. No separate victim action is required.\nS:U - The vulnerability corrupts kernel media/videobuf2 request state within the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The bug is a use-after-free involving media request objects and vb2 buffer/request state during concurrent cleanup and queue teardown. Per kernel CVSS guidance, UAF memory corruption can be leveraged for kernel memory disclosure, so confidentiality impact is high.\nI:H - The race can corrupt freed kernel heap objects and request/buffer state, giving a plausible path to control-flow or arbitrary-write style exploitation. Per kernel CVSS guidance, use-after-free memory corruption warrants high integrity impact.\nA:H - The fix commit explicitly addresses use-after-free reports, and such kernel UAFs can reliably trigger KASAN reports, oopses, or panics. This is a high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/media/mc/mc-request.c", "drivers/media/v4l2-core/v4l2-ioctl.c"], "versions": [{"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", "lessThan": "331242998a7ade5c2f65e14988901614629f3db5", "status": "affected", "versionType": "git"}, {"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", "lessThan": "2c685e99efb3b3bd2b78699fba6b1cf321975db0", "status": "affected", "versionType": "git"}, {"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", "lessThan": "585fd9a2063dacce8b2820f675ef23d5d17434c5", "status": "affected", "versionType": "git"}, {"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", "lessThan": "1a0d9083c24fbd5d22f7100f09d11e4d696a5f01", "status": "affected", "versionType": "git"}, {"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/331242998a7ade5c2f65e14988901614629f3db5"}, {"url": "https://git.kernel.org/stable/c/2c685e99efb3b3bd2b78699fba6b1cf321975db0"}, {"url": "https://git.kernel.org/stable/c/585fd9a2063dacce8b2820f675ef23d5d17434c5"}, {"url": "https://git.kernel.org/stable/c/1a0d9083c24fbd5d22f7100f09d11e4d696a5f01"}, {"url": "https://git.kernel.org/stable/c/d8549a453d5bdc0a71de66ad47a1106703406a56"}, {"url": "https://git.kernel.org/stable/c/72b9e81e0203f03c40f3adb457f55bd4c8eb112d"}, {"url": "https://git.kernel.org/stable/c/cf2023e84f0888f96f4b65dc0804e7f3651969c1"}, {"url": "https://git.kernel.org/stable/c/bef4f4a88b73e4cc550d25f665b8a9952af22773"}], "title": "media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": 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Extend that serialization to REQBUFS, and also take\nthe same mutex in media_request_ioctl_reinit() so REINIT is in the\nsame exclusion domain.\n\nThis keeps request cleanup and queue cancellation from running in\nparallel for request-capable devices."}], "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 paths are reached through local `ioctl()` calls on media/video device file descriptors: `MEDIA_REQUEST_IOC_REINIT` on a request fd and `VIDIOC_REQBUFS(0)` on a V4L2 video fd. The affected code is not reachable directly from network packets or adjacent/physical protocol input.\nAC:L - This is a race, but an attacker controls both racing operations by issuing concurrent ioctls from local threads or processes. No condition beyond access to a request-capable media device is required.\nPR:L - The kernel path has no capability or admin check; the attacker only needs ordinary local ability to open the relevant `/dev/media*` and `/dev/video*` nodes. This is basic local privilege rather than real root/admin privilege.\nUI:N - Once the attacker can run local code and open the device nodes, exploitation is driven entirely by attacker-issued ioctls. No separate victim action is required.\nS:U - The vulnerability corrupts kernel media/videobuf2 request state within the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The bug is a use-after-free involving media request objects and vb2 buffer/request state during concurrent cleanup and queue teardown. Per kernel CVSS guidance, UAF memory corruption can be leveraged for kernel memory disclosure, so confidentiality impact is high.\nI:H - The race can corrupt freed kernel heap objects and request/buffer state, giving a plausible path to control-flow or arbitrary-write style exploitation. Per kernel CVSS guidance, use-after-free memory corruption warrants high integrity impact.\nA:H - The fix commit explicitly addresses use-after-free reports, and such kernel UAFs can reliably trigger KASAN reports, oopses, or panics. This is a high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/media/mc/mc-request.c", "drivers/media/v4l2-core/v4l2-ioctl.c"], "versions": [{"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", "lessThan": "331242998a7ade5c2f65e14988901614629f3db5", "status": "affected", "versionType": "git"}, {"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", "lessThan": "2c685e99efb3b3bd2b78699fba6b1cf321975db0", "status": "affected", "versionType": "git"}, {"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", "lessThan": "585fd9a2063dacce8b2820f675ef23d5d17434c5", "status": "affected", "versionType": "git"}, {"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", "lessThan": "1a0d9083c24fbd5d22f7100f09d11e4d696a5f01", "status": "affected", "versionType": "git"}, {"version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9", 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"02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex\n\nMEDIA_REQUEST_IOC_REINIT can run concurrently with VIDIOC_REQBUFS(0)\nqueue teardown paths. This can race request object cleanup against vb2\nqueue cancellation and lead to use-after-free reports.\n\nWe already serialize request queueing against STREAMON/OFF with\nreq_queue_mutex. Extend that serialization to REQBUFS, and also take\nthe same mutex in media_request_ioctl_reinit() so REINIT is in the\nsame exclusion domain.\n\nThis keeps request cleanup and queue cancellation from running in\nparallel for request-capable devices."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmedia: mc, v4l2: serializar REINIT y REQBUFS con req_queue_mutex\n\nMEDIA_REQUEST_IOC_REINIT puede ejecutarse concurrentemente con las rutas de desmantelamiento de cola de VIDIOC_REQBUFS(0). Esto puede provocar una condici\u00f3n de carrera entre la limpieza de objetos de solicitud y la cancelaci\u00f3n de cola vb2, y conducir a informes de uso despu\u00e9s de liberaci\u00f3n.\n\nYa serializamos el encolamiento de solicitudes contra STREAMON/OFF con req_queue_mutex. Extender esa serializaci\u00f3n a REQBUFS, y tambi\u00e9n tomar el mismo mutex en media_request_ioctl_reinit() para que REINIT est\u00e9 en el mismo dominio de exclusi\u00f3n.\n\nEsto evita que la limpieza de solicitudes y la cancelaci\u00f3n de cola se ejecuten en paralelo para dispositivos con capacidad de solicitud."}], "id": "CVE-2026-31473", "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-2026-31473", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:09:53.356132Z", "version": "2.0.3"}}]}, "published": "2026-04-22T14:16:43.863", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1a0d9083c24fbd5d22f7100f09d11e4d696a5f01"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2c685e99efb3b3bd2b78699fba6b1cf321975db0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/331242998a7ade5c2f65e14988901614629f3db5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/585fd9a2063dacce8b2820f675ef23d5d17434c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/72b9e81e0203f03c40f3adb457f55bd4c8eb112d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bef4f4a88b73e4cc550d25f665b8a9952af22773"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cf2023e84f0888f96f4b65dc0804e7f3651969c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d8549a453d5bdc0a71de66ad47a1106703406a56"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex", "id": "2460734", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460734"}, "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-364", "details": ["A flaw was found in the Linux kernel's media, mc, and v4l2 subsystems. A race condition can occur when MEDIA_REQUEST_IOC_REINIT runs concurrently with VIDIOC_REQBUFS(0) queue teardown paths, leading to a use-after-free vulnerability. This flaw could allow a local attacker to cause a system crash (denial of service) or potentially execute arbitrary code with elevated privileges."], "name": "CVE-2026-31473", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31473\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31473\nhttps://lore.kernel.org/linux-cve-announce/2026042255-CVE-2026-31473-fad0@gregkh/T"], "threat_severity": "Moderate"}

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