CVE-2026-74664

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That identifier also becomes the inserted flow's identifier.\nFor updates, however, a request with a UFID may miss the UFID lookup and\nthen fall back to the flow key lookup. That lookup can legitimately find\nan existing key-identified flow. UFIDs are optional and the flow key is\nthe primary identifier.\n\nFor echoed replies, ovs_flow_cmd_fill_info() writes the matched flow's\nidentifier, not the request identifier used for the preallocation. A short\nrequest UFID can therefore leave too little room for the key identifier.\nThe fill can then fail with -EMSGSIZE and hit the BUG_ON(error < 0) in the\nupdate path.\n\nOnce the update target has been resolved, reallocate the reply skb if the\nmatched flow needs a larger reply than the request identifier allowed. Do\nthis before replacing the actions so the request can still fail cleanly if\nthe rare extra allocation fails."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/openvswitch/datapath.c"], "versions": [{"version": "74ed7ab9264c54471c7f057409d352052820d750", "lessThan": "bd8ca84d48cd9a4f6fc63df26512c55e1d339927", "status": "affected", "versionType": "git"}, {"version": "74ed7ab9264c54471c7f057409d352052820d750", "lessThan": "00f987f066e802793a37dd2167459e67cf2cf2ec", "status": "affected", "versionType": "git"}, {"version": "74ed7ab9264c54471c7f057409d352052820d750", "lessThan": "696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fc", "status": "affected", "versionType": "git"}, {"version": "74ed7ab9264c54471c7f057409d352052820d750", "lessThan": "87d0c0040b5d4b61de51ae39132c4c46709f2f77", "status": "affected", "versionType": "git"}, {"version": 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Do\nthis before replacing the actions so the request can still fail cleanly if\nthe rare extra allocation fails."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.152", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.104", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:32:36.616Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74664", "state": "PUBLISHED", "dateUpdated": "2026-11-06T17:05:50.323Z", "dateReserved": "2026-08-15T05:44:03.924Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:32:36.616Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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That identifier also becomes the inserted flow's identifier.\nFor updates, however, a request with a UFID may miss the UFID lookup and\nthen fall back to the flow key lookup. That lookup can legitimately find\nan existing key-identified flow. UFIDs are optional and the flow key is\nthe primary identifier.\n\nFor echoed replies, ovs_flow_cmd_fill_info() writes the matched flow's\nidentifier, not the request identifier used for the preallocation. A short\nrequest UFID can therefore leave too little room for the key identifier.\nThe fill can then fail with -EMSGSIZE and hit the BUG_ON(error < 0) in the\nupdate path.\n\nOnce the update target has been resolved, reallocate the reply skb if the\nmatched flow needs a larger reply than the request identifier allowed. Do\nthis before replacing the actions so the request can still fail cleanly if\nthe rare extra allocation fails."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nnet: openvswitch: reasignar respuestas de actualizaci\u00f3n para IDs no coincidentes\n\novs_flow_cmd_new() preasigna el skb de respuesta opcional antes de tomar ovs_mutex y antes de saber qu\u00e9 flujo existente se actualizar\u00e1.\n\nEsto normalmente est\u00e1 bien porque el skb se dimensiona a partir del identificador de flujo de la solicitud. Ese identificador tambi\u00e9n se convierte en el identificador del flujo insertado. Para las actualizaciones, sin embargo, una solicitud con un UFID puede fallar en la b\u00fasqueda de UFID y luego recurrir a la b\u00fasqueda de clave de flujo. Esa b\u00fasqueda puede encontrar leg\u00edtimamente un flujo existente identificado por clave. Los UFID son opcionales y la clave de flujo es el identificador principal.\n\nPara las respuestas con eco, ovs_flow_cmd_fill_info() escribe el identificador del flujo coincidente, no el identificador de la solicitud utilizado para la preasignaci\u00f3n. Un UFID de solicitud corto puede, por lo tanto, dejar muy poco espacio para el identificador de clave. El llenado puede entonces fallar con -EMSGSIZE y activar el BUG_ON(error < 0) en la ruta de actualizaci\u00f3n.\n\nUna vez que se ha resuelto el objetivo de actualizaci\u00f3n, reasigne el skb de respuesta si el flujo coincidente necesita una respuesta m\u00e1s grande de lo que permit\u00eda el identificador de la solicitud. Haga esto antes de reemplazar las acciones para que la solicitud a\u00fan pueda fallar limpiamente si la rara asignaci\u00f3n adicional falla."}], "id": "CVE-2026-74664", "lastModified": "2026-11-06T17:19:53.153", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74664", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T17:00:43.008872Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:40.220", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/00f987f066e802793a37dd2167459e67cf2cf2ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/20751193d83be2e9735d4faee71375691c09cd13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/23716dd9d8d46a5908536b73dc085e62f2b5c237"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5d1c224dd914579524a183a514c12b95095d12ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/69f40ccf85074981340847d650a9cbf9adabfbbe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/87d0c0040b5d4b61de51ae39132c4c46709f2f77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bd8ca84d48cd9a4f6fc63df26512c55e1d339927"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net: openvswitch: reallocate update replies for mismatched IDs", "id": "2521361", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521361"}, "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-131", "details": ["A flaw was found in the Linux kernel's Open vSwitch component. When processing flow updates, the `ovs_flow_cmd_new()` function preallocates a reply buffer based on the request's flow identifier. If a shorter User Flow ID (UFID) is provided, but the system matches an existing flow with a longer key identifier, the subsequent attempt to write the matched flow's identifier into the preallocated buffer can exceed its size. This can lead to an error and trigger a kernel panic, resulting in a denial of service."], "name": "CVE-2026-74664", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "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": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74664\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74664\nhttps://lore.kernel.org/linux-cve-announce/2026082228-CVE-2026-74664-59ea@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[74ed7ab9264c54471c7f057409d352052820d750,bd8ca84d48cd9a4f6fc63df26512c55e1d339927)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[74ed7ab9264c54471c7f057409d352052820d750,00f987f066e802793a37dd2167459e67cf2cf2ec)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[74ed7ab9264c54471c7f057409d352052820d750,696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[74ed7ab9264c54471c7f057409d352052820d750,87d0c0040b5d4b61de51ae39132c4c46709f2f77)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[74ed7ab9264c54471c7f057409d352052820d750,69f40ccf85074981340847d650a9cbf9adabfbbe)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[74ed7ab9264c54471c7f057409d352052820d750,23716dd9d8d46a5908536b73dc085e62f2b5c237)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[74ed7ab9264c54471c7f057409d352052820d750,20751193d83be2e9735d4faee71375691c09cd13)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[74ed7ab9264c54471c7f057409d352052820d750,5d1c224dd914579524a183a514c12b95095d12ce)"}}], "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": "semver", "value": "4.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "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": "2026-08-22T18:30:16.838952+00:00", "updated": "2026-08-24T20:45:04.341455+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}