{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31676", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.130Z", "datePublished": "2026-04-25T08:46:52.285Z", "dateUpdated": "2026-10-16T15:20:23.424Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:23.558Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: only handle RESPONSE during service challenge\n\nOnly process RESPONSE packets while the service connection is still in\nRXRPC_CONN_SERVICE_CHALLENGING. 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." } ], "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": "17926a79320afa9b95df6b977b40cca6d8713cea", "lessThan": "a1a8efde03a40b6c658d580e96644d9b9a2a0d3a", "status": "affected", "versionType": "git" }, { "version": "17926a79320afa9b95df6b977b40cca6d8713cea", "lessThan": "6c3a0fbdafef8316e34ae22333e317a341e737cd", "status": "affected", "versionType": "git" }, { "version": "17926a79320afa9b95df6b977b40cca6d8713cea", "lessThan": "0afdfd4941c1b60a1f5c361760daa970edca60cd", "status": "affected", "versionType": "git" }, { "version": "17926a79320afa9b95df6b977b40cca6d8713cea", "lessThan": "a6bcf8010af093fe04f7100562e9542ab7882585", "status": "affected", "versionType": "git" }, { "version": "17926a79320afa9b95df6b977b40cca6d8713cea", "lessThan": "29b44d904dceb832be880def08b8cb17a0aba91c", "status": "affected", "versionType": "git" }, { "version": "17926a79320afa9b95df6b977b40cca6d8713cea", "lessThan": "d0035e634dae83237ab7f5681eb52b2f65d0ceb8", "status": "affected", "versionType": "git" }, { "version": "17926a79320afa9b95df6b977b40cca6d8713cea", "lessThan": "03fd2ef73cb4ffd0af100a95b634af54f474414e", "status": "affected", "versionType": "git" }, { "version": "17926a79320afa9b95df6b977b40cca6d8713cea", "lessThan": "c43ffdcfdbb5567b1f143556df8a04b4eeea041c", "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/rxrpc/conn_event.c" ], "versions": [ { "version": "2.6.22", "status": "affected" }, { "version": "0", "lessThan": "2.6.22", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.84", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.23", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.13", "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": "2.6.22", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.6.136" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.12.84" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.18.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.19.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a1a8efde03a40b6c658d580e96644d9b9a2a0d3a" }, { "url": "https://git.kernel.org/stable/c/6c3a0fbdafef8316e34ae22333e317a341e737cd" }, { "url": "https://git.kernel.org/stable/c/0afdfd4941c1b60a1f5c361760daa970edca60cd" }, { "url": "https://git.kernel.org/stable/c/a6bcf8010af093fe04f7100562e9542ab7882585" }, { "url": "https://git.kernel.org/stable/c/29b44d904dceb832be880def08b8cb17a0aba91c" }, { "url": "https://git.kernel.org/stable/c/d0035e634dae83237ab7f5681eb52b2f65d0ceb8" }, { "url": "https://git.kernel.org/stable/c/03fd2ef73cb4ffd0af100a95b634af54f474414e" }, { "url": "https://git.kernel.org/stable/c/c43ffdcfdbb5567b1f143556df8a04b4eeea041c" } ], "title": "rxrpc: only handle RESPONSE during service challenge", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:17:45.719Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html" } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-31676", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:12:15.479986Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:20:23.424Z" } } ] } }