CVE-2026-80889 (GCVE-0-2026-80889)
Vulnerability from cvelistv5
Published
2026-09-04 17:11
Modified
2026-09-04 17:11
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: bbedeb67a9a684f2fb78c55bd3662c400526715e Version: 377a8f500704da42ed86a4541ed930e9dcfdb2ea Version: 6da8119e8dd542194103139812d1a4b7dcd1aedd Version: 0b05eca9589f609e2491b528dccf683168a4cda8 Version: a7d90e7b5e75d7406c889fe36e9a61ee364a00cb Version: 37beb16e08cae94cc05840c7274225e3b0b38ae7 Version: 4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca Version: cf070fe33bfbd1a4c21236078fadb35dd223a157 |
||
{
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"cpeApplicability": [
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"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-\u003erx_lock\") which addresses following\nsashiko-bot findings:\n\n- isotp_sendmsg(): drain so-\u003etxfrtimer first so a stale callback can\u0027t\n re-arm echotimer after the claim\n\n- isotp_release(): wake so-\u003ewait after forcing ISOTP_SHUTDOWN so a\n sleeping sendmsg() claim isn\u0027t 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\u0027t touch timers and states of the new transfer if a new thread\n incremented so-\u003etx_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-\u003etx_result[], tagged with the caller\u0027s own generation.\n\n- isotp_tx_timeout(): on a claimed timeout, record the ECOMM error for\n the timed-out transfer\u0027s own generation in so-\u003etx_result[]; sk-\u003esk_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-\u003etx_result[], so an already-reported error\n doesn\u0027t stay latched for a later poll()/SO_ERROR.\n\nAlso align the remaining lock-free so-\u003etx.state/rx.state/cfecho accesses\nand use skb-\u003ehash 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"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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