{"api_version":"1","generated_at":"2026-09-12T11:44:40+00:00","cve":"CVE-2026-80889","urls":{"html":"https://cve.report/CVE-2026-80889","api":"https://cve.report/api/cve/CVE-2026-80889.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80889","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80889"},"summary":{"title":"can: isotp: fix timer drain order, wakeup handling and tx_gen ordering","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-04 18:17:56","updated_at":"2026-09-04 18:17:56"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572","name":"https://git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e","name":"https://git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29","name":"https://git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7","name":"https://git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239","name":"https://git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6","name":"https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048","name":"https://git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0","name":"https://git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80889","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80889","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bbedeb67a9a684f2fb78c55bd3662c400526715e 8acab9fc66d6f426c36968c91a979f70784945a7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 377a8f500704da42ed86a4541ed930e9dcfdb2ea af7e25c649ed68cbad07f8185af0f31b892cbf29 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6da8119e8dd542194103139812d1a4b7dcd1aedd 2753722612d8824d3910096f93059f669009b0f0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0b05eca9589f609e2491b528dccf683168a4cda8 bf5c4a8b24acb12739ebb9aea5510b007e4f5239 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.148 6.6.151 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.101 6.12.103 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.40 6.18.44 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1.5 7.1.8 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80889","cve":"CVE-2026-80889","epss":"0.001770000","percentile":"0.073350000","score_date":"2026-09-07","updated_at":"2026-09-08 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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."}],"providerMetadata":{"dateUpdated":"2026-09-04T17:11:05.854Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80889","datePublished":"2026-09-04T17:11:05.854Z","dateReserved":"2026-08-26T14:34:25.799Z","dateUpdated":"2026-09-04T17:11:05.854Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-04 18:17:56","lastModifiedDate":"2026-09-04 18:17:56","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80889","Ordinal":"1","Title":"can: isotp: fix timer drain order, wakeup handling and tx_gen or","CVE":"CVE-2026-80889","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80889","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"can: isotp: fix timer drain order, wakeup handling and tx_gen or"}]}}}