CVE-2026-31676

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This keeps duplicate or late RESPONSE packets from\nre-running the setup path and removes the unlocked post-transition state\ntest."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - RxRPC is a UDP-based network protocol, and the vulnerable RESPONSE handling is reached by packets sent to a listening AF_RXRPC service endpoint.\nAC:L - The attacker controls the packet timing and can send duplicate or late RESPONSE packets on a service connection; no uncontrollable race or special memory layout is required to trigger repeated setup processing.\nPR:N - The packet path is reached during the service-side authentication handshake before local privileges are required on the target, and a remote peer can exercise it by sending RxRPC protocol packets to the exposed service.\nUI:N - No victim user action is needed once an RxRPC service is listening; packet processing occurs in the kernel receive path.\nS:U - The impact remains within the kernel and the affected RxRPC service security authority, with no VM, sandbox, or separate security-scope escape.\nC:N - The bug re-runs connection security setup and leaks/replaces connection security objects, but I found no direct information disclosure or arbitrary read primitive.\nI:N - The reachable effect is improper repeated security initialization rather than attacker-controlled memory corruption or arbitrary modification of protected data.\nA:H - Repeated late or duplicate RESPONSE packets can repeatedly allocate and leak connection security state and disrupt/abort RxRPC connections, making kernel or service-level denial of service a reasonable impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/rxrpc/conn_event.c"], "versions": [{"version": 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Check that state under state_lock before\nrunning response verification and security initialization, then use a local\nsecured flag to decide whether to queue the secured-connection work after\nthe state transition. This keeps duplicate or late RESPONSE packets from\nre-running the setup path and removes the unlocked post-transition state\ntest."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nrxrpc: solo manejar RESPUESTA durante el desaf\u00edo de servicio\n\nSolo procesar paquetes de RESPUESTA mientras la conexi\u00f3n de servicio todav\u00eda est\u00e1 en RXRPC_CONN_SERVICE_CHALLENGING. Verificar ese estado bajo state_lock antes de ejecutar la verificaci\u00f3n de respuesta y la inicializaci\u00f3n de seguridad, luego usar un indicador seguro local para decidir si encolar el trabajo de conexi\u00f3n segura despu\u00e9s de la transici\u00f3n de estado. Esto evita que los paquetes de RESPUESTA duplicados o tard\u00edos vuelvan a ejecutar la ruta de configuraci\u00f3n y elimina la prueba de estado posterior a la transici\u00f3n desbloqueada."}], "id": "CVE-2026-31676", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31676", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:12:15.479986Z", "version": "2.0.3"}}]}, "published": "2026-04-25T09:16:01.210", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03fd2ef73cb4ffd0af100a95b634af54f474414e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0afdfd4941c1b60a1f5c361760daa970edca60cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/29b44d904dceb832be880def08b8cb17a0aba91c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6c3a0fbdafef8316e34ae22333e317a341e737cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a1a8efde03a40b6c658d580e96644d9b9a2a0d3a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a6bcf8010af093fe04f7100562e9542ab7882585"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c43ffdcfdbb5567b1f143556df8a04b4eeea041c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d0035e634dae83237ab7f5681eb52b2f65d0ceb8"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "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: rxrpc: only handle RESPONSE during service challenge", "id": "2461755", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461755"}, "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-372", "details": ["A flaw was found in the `rxrpc` subsystem of the Linux kernel. This vulnerability allows for duplicate or late `RESPONSE` packets to be processed outside of the expected service challenging state. An attacker could potentially exploit this by sending specially crafted `RESPONSE` packets, leading to the re-execution of the setup path. This could result in unexpected system behavior or resource consumption."], "name": "CVE-2026-31676", "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": "2026-04-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31676\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31676\nhttps://lore.kernel.org/linux-cve-announce/2026042543-CVE-2026-31676-ff79@gregkh/T"], "threat_severity": "Moderate"}

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