{
  "cveId": "CVE-2026-80889",
  "url": "https://patchblox.com/security/cve/CVE-2026-80889",
  "summary": "CVE-2026-80889 is fixed in 40 products on 1 platform, first by DEBIAN-CVE-2026-80889, released September 5, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "can: isotp: fix timer drain order, wakeup handling and tx_gen ordering",
  "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 (\u0022can: isotp: serialize TX state transitions under so-\u003Erx_lock\u0022) which addresses following sashiko-bot findings:  - isotp_sendmsg(): drain so-\u003Etxfrtimer first so a stale callback can\u0027t   re-arm echotimer after the claim  - isotp_release(): wake so-\u003Ewait after forcing ISOTP_SHUTDOWN so a   sleeping sendmsg() claim isn\u0027t 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\u0027t touch timers and states of the new transfer if a new thread   incremented so-\u003Etx_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-\u003Etx_result[], tagged with the caller\u0027s own generation.  - isotp_tx_timeout(): on a claimed timeout, record the ECOMM error for   the timed-out transfer\u0027s own generation in so-\u003Etx_result[]; sk-\u003Esk_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-\u003Etx_result[], so an already-reported error   doesn\u0027t stay latched for a later poll()/SO_ERROR.  Also align the remaining lock-free so-\u003Etx.state/rx.state/cfecho accesses and use skb-\u003Ehash as unique loopback echo frame indicator.",
  "published": "2026-09-04T18:17:56Z",
  "severity": "Low",
  "cvss": 7.8,
  "epss": 0.00177,
  "epssPercentile": 0.0734,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80889",
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  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}