can: isotp: fix timer drain order, wakeup handling and tx_gen ordering

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80889
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 18:17:56 UTC
Updated2026-09-04 18:17:56 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: can: isotp: fix timer drain order, wakeup handling and tx_gen ordering This patch is a follow-up to commit cf070fe33bfb ("can: isotp: serialize TX state transitions under so->rx_lock") which addresses following sashiko-bot findings: - isotp_sendmsg(): drain so->txfrtimer first so a stale callback can't re-arm echotimer after the claim - isotp_release(): wake so->wait after forcing ISOTP_SHUTDOWN so a sleeping sendmsg() claim isn't stranded - isotp_sendmsg(): have both wait_event_interruptible() calls in isotp_sendmsg() also wake on ISOTP_SHUTDOWN and do not return claim to IDLE to avoid corrupting a concurrent isotp_release() process. - isotp_sendmsg(): handle potential claim of a new transfer when the wait_event_interruptible() call returns in CAN_ISOTP_WAIT_TX_DONE mode. Don't touch timers and states of the new transfer if a new thread incremented so->tx_gen before getting the lock at err_event_drop. - isotp_sendmsg(): handle a stuck can_send() and omit timer and state changes if a new transfer was claimed. wait_tx_done() returns the error recorded in so->tx_result[], tagged with the caller's own generation. - isotp_tx_timeout(): on a claimed timeout, record the ECOMM error for the timed-out transfer's own generation in so->tx_result[]; sk->sk_err is raised unconditionally, same as every other error path here. - isotp_tx_gen_done()/isotp_tx_timeout(): always read tx.state (acquire) before tx_gen - the reverse order let a weakly ordered CPU pair a fresh tx.state with a stale tx_gen/tx_result slot. - isotp_sendmsg(): wait_tx_done: drain sk_err via sock_error() once we have read the result from so->tx_result[], so an already-reported error doesn't stay latched for a later poll()/SO_ERROR. Also align the remaining lock-free so->tx.state/rx.state/cfecho accesses and use skb->hash as unique loopback echo frame indicator.

Risk And Classification

EPSS: 0.001770000 probability, percentile 0.073350000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bbedeb67a9a684f2fb78c55bd3662c400526715e 8acab9fc66d6f426c36968c91a979f70784945a7 git Not specified
CNA Linux Linux affected 377a8f500704da42ed86a4541ed930e9dcfdb2ea af7e25c649ed68cbad07f8185af0f31b892cbf29 git Not specified
CNA Linux Linux affected 6da8119e8dd542194103139812d1a4b7dcd1aedd 2753722612d8824d3910096f93059f669009b0f0 git Not specified
CNA Linux Linux affected 0b05eca9589f609e2491b528dccf683168a4cda8 bf5c4a8b24acb12739ebb9aea5510b007e4f5239 git Not specified
CNA Linux Linux affected a7d90e7b5e75d7406c889fe36e9a61ee364a00cb deca7746b57d982cd4f0301f4443f56780c4a048 git Not specified
CNA Linux Linux affected 37beb16e08cae94cc05840c7274225e3b0b38ae7 10be509fa8fd95d1e47d40d1f68b0b26dfe9d572 git Not specified
CNA Linux Linux affected 4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca 35c62ac98d06669aa3f0f38b7829eaca929a611e git Not specified
CNA Linux Linux affected cf070fe33bfbd1a4c21236078fadb35dd223a157 050f010f920da17c1044a4f174766ad553e770b6 git Not specified
CNA Linux Linux affected 5.10.265 5.10.267 semver Not specified
CNA Linux Linux affected 5.15.216 5.15.218 semver Not specified
CNA Linux Linux affected 6.1.183 6.1.185 semver Not specified
CNA Linux Linux affected 6.6.148 6.6.151 semver Not specified
CNA Linux Linux affected 6.12.101 6.12.103 semver Not specified
CNA Linux Linux affected 6.18.40 6.18.44 semver Not specified
CNA Linux Linux affected 7.1.5 7.1.8 semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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