{ "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" } } } }