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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-80889

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • bbedeb67a9a684f2fb78c55bd3662c400526715e to < 8acab9fc66d6f426c36968c91a979f70784945a7affected
  • 377a8f500704da42ed86a4541ed930e9dcfdb2ea to < af7e25c649ed68cbad07f8185af0f31b892cbf29affected
  • 6da8119e8dd542194103139812d1a4b7dcd1aedd to < 2753722612d8824d3910096f93059f669009b0f0affected
  • 0b05eca9589f609e2491b528dccf683168a4cda8 to < bf5c4a8b24acb12739ebb9aea5510b007e4f5239affected
  • a7d90e7b5e75d7406c889fe36e9a61ee364a00cb to < deca7746b57d982cd4f0301f4443f56780c4a048affected
  • 37beb16e08cae94cc05840c7274225e3b0b38ae7 to < 10be509fa8fd95d1e47d40d1f68b0b26dfe9d572affected
  • 4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca to < 35c62ac98d06669aa3f0f38b7829eaca929a611eaffected
  • cf070fe33bfbd1a4c21236078fadb35dd223a157 to < 050f010f920da17c1044a4f174766ad553e770b6affected

Linux Linux

Default version status: unaffected

  • 5.10.265 to < 5.10.267affected
  • 5.15.216 to < 5.15.218affected
  • 6.1.183 to < 6.1.185affected
  • 6.6.148 to < 6.6.151affected
  • 6.12.101 to < 6.12.103affected
  • 6.18.40 to < 6.18.44affected
  • 7.1.5 to < 7.1.8affected

References