{"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"}}}}