CVE-2026-80889
Estado: RecibidaSin puntuar—
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:
Also align the remaining lock-free so->tx.state/rx.state/cfecho accesses and use skb->hash as unique loopback echo frame indicator.
Detalles técnicos trazas, registros y código del informe original
- 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.
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.22%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6
- https://git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572
- https://git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0
- https://git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e
- https://git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7
- https://git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29
- https://git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239
- https://git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-80889",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"published": "2026-09-04T18:17:56.910",
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}
],
"vulnStatus": "Received",
"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."
}
],
"lastModified": "2026-09-04T18:17:56.910",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}