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  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80889.json"
  },
  "details": "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't\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'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-\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'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-\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't 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.",
  "id": "CVE-2026-80889",
  "modified": "2026-09-06T03:30:38.307439940Z",
  "published": "2026-09-04T17:11:05.854Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80889.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80889"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "can: isotp: fix timer drain order, wakeup handling and tx_gen ordering"
}