{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-22997", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.938Z", "datePublished": "2026-01-25T14:36:12.053Z", "dateUpdated": "2026-08-05T12:20:01.212Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:01.212Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts\n\nSince j1939_session_deactivate_activate_next() in j1939_tp_rxtimer() is\ncalled only when the timer is enabled, we need to call\nj1939_session_deactivate_activate_next() if we cancelled the timer.\nOtherwise, refcount for j1939_session leaks, which will later appear as\n\n| unregister_netdevice: waiting for vcan0 to become free. Usage count = 2.\n\nproblem." } ], "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 - The vulnerable path is reached by received SAE J1939 transport-control frames delivered through the CAN network receive path into j1939_can_recv(), j1939_tp_recv(), j1939_tp_cmd_recv(), j1939_xtp_rx_rts(), and then j1939_xtp_rx_rts_session_active(). A remote CAN/J1939 peer can send the duplicate RTS/BAM sequence to a Linux node using a bound J1939 socket, so the attacker does not need local execution on the target.\nAC:L - The trigger is a controlled protocol sequence involving a second RTS/BAM for an active receiver session; the attacker controls the packet timing and contents. No hard-to-win race or condition outside attacker influence is required.\nPR:N - Received CAN/J1939 frames enter the vulnerable receive path without authentication or credential checks. In the highest reasonable deployment, the attacker is an unauthenticated peer on the J1939/CAN network.\nUI:N - No victim interaction is required once the target is running the J1939 stack with a bound socket. The attacker only needs to transmit the crafted J1939 frames.\nS:U - The bug affects kernel CAN/J1939 session and netdevice lifetime management within the same kernel security authority. It does not cross a VM, sandbox, IOMMU, or other separate security boundary.\nC:N - The bug is a reference-count leak caused by failing to deactivate a receiver session after cancelling its timer. The investigation did not identify memory disclosure, arbitrary read, or use-after-free behavior.\nI:N - The leaked references pin session/private/netdevice objects but do not provide attacker-controlled data modification or a write primitive. There is no evidence of control-flow corruption or persistent data tampering.\nA:H - The leaked J1939 session/private references pin the CAN net_device and can make unregister_netdevice wait indefinitely with a nonzero usage count. This is a persistent denial of service against network device or namespace teardown and can be retriggered." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/can/j1939/transport.c" ], "versions": [ { "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "a73e7d7e346dae1c22dc3e95b02ca464b12daf2c", "status": "affected", "versionType": "git" }, { "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "adabf01c19561e42899da9de56a6a1da0e6b8a5b", "status": "affected", "versionType": "git" }, { "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "b1d67607e97d489c0cfbbf55f48a76b00710b0e4", "status": "affected", "versionType": "git" }, { "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "809a437e27a3bf3c1c6c8c157773635552116f2b", "status": "affected", "versionType": "git" }, { "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "cb2a610867bc379988bae0bb4b8bbc59c0decf1a", "status": "affected", "versionType": "git" }, { "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "6121b7564c725b632ffe4764abe85aa239d37703", "status": "affected", "versionType": "git" }, { "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "1809c82aa073a11b7d335ae932d81ce51a588a4a", "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/can/j1939/transport.c" ], "versions": [ { "version": "5.4", "status": "affected" }, { "version": "0", "lessThan": "5.4", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.249", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.199", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.162", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.122", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.67", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.7", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19", "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": "5.4", "versionEndExcluding": "5.10.249" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "5.15.199" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.1.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.6.122" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.12.67" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.18.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a73e7d7e346dae1c22dc3e95b02ca464b12daf2c" }, { "url": "https://git.kernel.org/stable/c/adabf01c19561e42899da9de56a6a1da0e6b8a5b" }, { "url": "https://git.kernel.org/stable/c/b1d67607e97d489c0cfbbf55f48a76b00710b0e4" }, { "url": "https://git.kernel.org/stable/c/809a437e27a3bf3c1c6c8c157773635552116f2b" }, { "url": "https://git.kernel.org/stable/c/cb2a610867bc379988bae0bb4b8bbc59c0decf1a" }, { "url": "https://git.kernel.org/stable/c/6121b7564c725b632ffe4764abe85aa239d37703" }, { "url": "https://git.kernel.org/stable/c/1809c82aa073a11b7d335ae932d81ce51a588a4a" } ], "title": "net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-06-16T20:36:25.922251Z", "id": "CVE-2026-22997", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-16T20:36:36.417Z" } } ] } }