CVE-2026-80889

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80889", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.799Z", "datePublished": "2026-09-04T17:11:05.854Z", "dateUpdated": "2026-09-04T17:11:05.854Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-04T17:11:05.854Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: fix timer drain order, wakeup handling and tx_gen ordering\n\nThis patch is a follow-up to commit cf070fe33bfb (\"can: isotp: serialize\nTX state transitions under so->rx_lock\") which addresses following\nsashiko-bot findings:\n\n- isotp_sendmsg(): drain so->txfrtimer first so a stale callback can't\n re-arm echotimer after the claim\n\n- isotp_release(): wake so->wait after forcing ISOTP_SHUTDOWN so a\n sleeping sendmsg() claim isn't stranded\n\n- isotp_sendmsg(): have both wait_event_interruptible() calls in\n isotp_sendmsg() also wake on ISOTP_SHUTDOWN and do not return claim to\n IDLE to avoid corrupting a concurrent isotp_release() process.\n\n- isotp_sendmsg(): handle potential claim of a new transfer when\n the wait_event_interruptible() call returns in CAN_ISOTP_WAIT_TX_DONE\n mode. Don't touch timers and states of the new transfer if a new thread\n incremented so->tx_gen before getting the lock at err_event_drop.\n\n- isotp_sendmsg(): handle a stuck can_send() and omit timer and state\n changes if a new transfer was claimed. wait_tx_done() returns the error\n recorded in so->tx_result[], tagged with the caller's own generation.\n\n- isotp_tx_timeout(): on a claimed timeout, record the ECOMM error for\n the timed-out transfer's own generation in so->tx_result[]; sk->sk_err\n is raised unconditionally, same as every other error path here.\n\n- isotp_tx_gen_done()/isotp_tx_timeout(): always read tx.state (acquire)\n before tx_gen - the reverse order let a weakly ordered CPU pair a fresh\n tx.state with a stale tx_gen/tx_result slot.\n\n- isotp_sendmsg(): wait_tx_done: drain sk_err via sock_error() once we\n have read the result from so->tx_result[], so an already-reported error\n doesn't stay latched for a later poll()/SO_ERROR.\n\nAlso align the remaining lock-free so->tx.state/rx.state/cfecho accesses\nand use skb->hash as unique loopback echo frame indicator."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/can/isotp.c"], "versions": [{"version": "bbedeb67a9a684f2fb78c55bd3662c400526715e", "lessThan": "8acab9fc66d6f426c36968c91a979f70784945a7", "status": "affected", "versionType": "git"}, {"version": "377a8f500704da42ed86a4541ed930e9dcfdb2ea", "lessThan": "af7e25c649ed68cbad07f8185af0f31b892cbf29", "status": "affected", "versionType": "git"}, {"version": "6da8119e8dd542194103139812d1a4b7dcd1aedd", "lessThan": "2753722612d8824d3910096f93059f669009b0f0", "status": "affected", "versionType": "git"}, {"version": "0b05eca9589f609e2491b528dccf683168a4cda8", "lessThan": "bf5c4a8b24acb12739ebb9aea5510b007e4f5239", "status": "affected", "versionType": "git"}, {"version": "a7d90e7b5e75d7406c889fe36e9a61ee364a00cb", "lessThan": "deca7746b57d982cd4f0301f4443f56780c4a048", "status": "affected", "versionType": "git"}, {"version": "37beb16e08cae94cc05840c7274225e3b0b38ae7", "lessThan": "10be509fa8fd95d1e47d40d1f68b0b26dfe9d572", "status": "affected", "versionType": "git"}, {"version": "4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca", "lessThan": "35c62ac98d06669aa3f0f38b7829eaca929a611e", "status": "affected", "versionType": "git"}, {"version": "cf070fe33bfbd1a4c21236078fadb35dd223a157", "lessThan": "050f010f920da17c1044a4f174766ad553e770b6", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/can/isotp.c"], "versions": [{"version": "5.10.265", "lessThan": "5.10.267", "status": "affected", "versionType": "semver"}, {"version": "5.15.216", "lessThan": "5.15.218", "status": "affected", "versionType": "semver"}, {"version": "6.1.183", "lessThan": "6.1.185", "status": "affected", "versionType": "semver"}, {"version": "6.6.148", "lessThan": "6.6.151", "status": "affected", "versionType": "semver"}, {"version": "6.12.101", "lessThan": "6.12.103", "status": "affected", "versionType": "semver"}, {"version": "6.18.40", "lessThan": "6.18.44", "status": "affected", "versionType": "semver"}, {"version": "7.1.5", "lessThan": "7.1.8", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.265", "versionEndExcluding": "5.10.267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.216", "versionEndExcluding": "5.15.218"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.183", "versionEndExcluding": "6.1.185"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.148", "versionEndExcluding": "6.6.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.101", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.40", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1.5", "versionEndExcluding": "7.1.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7"}, {"url": "https://git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29"}, {"url": "https://git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0"}, {"url": "https://git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239"}, {"url": "https://git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048"}, {"url": "https://git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572"}, {"url": "https://git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e"}, {"url": "https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6"}], "title": "can: isotp: fix timer drain order, wakeup handling and tx_gen ordering", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/can/isotp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8acab9fc66d6f426c36968c91a979f70784945a7", "status": "affected", "version": "bbedeb67a9a684f2fb78c55bd3662c400526715e", "versionType": "git"}, {"lessThan": "af7e25c649ed68cbad07f8185af0f31b892cbf29", "status": "affected", "version": "377a8f500704da42ed86a4541ed930e9dcfdb2ea", "versionType": "git"}, {"lessThan": "2753722612d8824d3910096f93059f669009b0f0", "status": "affected", "version": "6da8119e8dd542194103139812d1a4b7dcd1aedd", "versionType": "git"}, {"lessThan": "bf5c4a8b24acb12739ebb9aea5510b007e4f5239", "status": "affected", "version": "0b05eca9589f609e2491b528dccf683168a4cda8", "versionType": "git"}, {"lessThan": "deca7746b57d982cd4f0301f4443f56780c4a048", "status": "affected", "version": "a7d90e7b5e75d7406c889fe36e9a61ee364a00cb", "versionType": "git"}, {"lessThan": "10be509fa8fd95d1e47d40d1f68b0b26dfe9d572", "status": "affected", "version": "37beb16e08cae94cc05840c7274225e3b0b38ae7", "versionType": "git"}, {"lessThan": "35c62ac98d06669aa3f0f38b7829eaca929a611e", "status": "affected", "version": "4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca", "versionType": "git"}, {"lessThan": "050f010f920da17c1044a4f174766ad553e770b6", "status": "affected", "version": "cf070fe33bfbd1a4c21236078fadb35dd223a157", "versionType": "git"}]}, {"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/can/isotp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5.10.267", "status": "affected", "version": "5.10.265", "versionType": "semver"}, {"lessThan": "5.15.218", "status": "affected", "version": "5.15.216", "versionType": "semver"}, {"lessThan": "6.1.185", "status": "affected", "version": "6.1.183", "versionType": "semver"}, {"lessThan": "6.6.151", "status": "affected", "version": "6.6.148", "versionType": "semver"}, {"lessThan": "6.12.103", "status": "affected", "version": "6.12.101", "versionType": "semver"}, {"lessThan": "6.18.44", "status": "affected", "version": "6.18.40", "versionType": "semver"}, {"lessThan": "7.1.8", "status": "affected", "version": "7.1.5", "versionType": "semver"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: fix timer drain order, wakeup handling and tx_gen ordering\n\nThis patch is a follow-up to commit cf070fe33bfb (\"can: isotp: serialize\nTX state transitions under so->rx_lock\") which addresses following\nsashiko-bot findings:\n\n- isotp_sendmsg(): drain so->txfrtimer first so a stale callback can't\n re-arm echotimer after the claim\n\n- isotp_release(): wake so->wait after forcing ISOTP_SHUTDOWN so a\n sleeping sendmsg() claim isn't stranded\n\n- isotp_sendmsg(): have both wait_event_interruptible() calls in\n isotp_sendmsg() also wake on ISOTP_SHUTDOWN and do not return claim to\n IDLE to avoid corrupting a concurrent isotp_release() process.\n\n- isotp_sendmsg(): handle potential claim of a new transfer when\n the wait_event_interruptible() call returns in CAN_ISOTP_WAIT_TX_DONE\n mode. Don't touch timers and states of the new transfer if a new thread\n incremented so->tx_gen before getting the lock at err_event_drop.\n\n- isotp_sendmsg(): handle a stuck can_send() and omit timer and state\n changes if a new transfer was claimed. wait_tx_done() returns the error\n recorded in so->tx_result[], tagged with the caller's own generation.\n\n- isotp_tx_timeout(): on a claimed timeout, record the ECOMM error for\n the timed-out transfer's own generation in so->tx_result[]; sk->sk_err\n is raised unconditionally, same as every other error path here.\n\n- isotp_tx_gen_done()/isotp_tx_timeout(): always read tx.state (acquire)\n before tx_gen - the reverse order let a weakly ordered CPU pair a fresh\n tx.state with a stale tx_gen/tx_result slot.\n\n- isotp_sendmsg(): wait_tx_done: drain sk_err via sock_error() once we\n have read the result from so->tx_result[], so an already-reported error\n doesn't stay latched for a later poll()/SO_ERROR.\n\nAlso align the remaining lock-free so->tx.state/rx.state/cfecho accesses\nand use skb->hash as unique loopback echo frame indicator."}], "id": "CVE-2026-80889", "lastModified": "2026-09-04T18:17:56.910", "metrics": {}, "published": "2026-09-04T18:17:56.910", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bbedeb67a9a684f2fb78c55bd3662c400526715e,8acab9fc66d6f426c36968c91a979f70784945a7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[377a8f500704da42ed86a4541ed930e9dcfdb2ea,af7e25c649ed68cbad07f8185af0f31b892cbf29)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6da8119e8dd542194103139812d1a4b7dcd1aedd,2753722612d8824d3910096f93059f669009b0f0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0b05eca9589f609e2491b528dccf683168a4cda8,bf5c4a8b24acb12739ebb9aea5510b007e4f5239)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a7d90e7b5e75d7406c889fe36e9a61ee364a00cb,deca7746b57d982cd4f0301f4443f56780c4a048)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[37beb16e08cae94cc05840c7274225e3b0b38ae7,10be509fa8fd95d1e47d40d1f68b0b26dfe9d572)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca,35c62ac98d06669aa3f0f38b7829eaca929a611e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cf070fe33bfbd1a4c21236078fadb35dd223a157,050f010f920da17c1044a4f174766ad553e770b6)"}}], "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": "[5.10.265,5.10.267)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.216,5.15.218)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.183,6.1.185)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.148,6.6.151)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.101,6.12.103)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.40,6.18.44)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.1.5,7.1.8)"}}], "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": "2026-09-04T20:30:16.928986+00:00", "updated": "2026-09-04T21:45:17.220311+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362"]}