Vulnerability-Lookup

CVE-2026-80889 (GCVE-0-2026-80889)

Vulnerability from cvelistv5 – Published: 2026-09-04 17:11 – Updated: 2026-09-04 17:11

Title

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

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/8acab9fc66d6f426c…
https://git.kernel.org/stable/c/af7e25c649ed68cba…
https://git.kernel.org/stable/c/2753722612d8824d3…
https://git.kernel.org/stable/c/bf5c4a8b24acb1273…
https://git.kernel.org/stable/c/deca7746b57d982cd…
https://git.kernel.org/stable/c/10be509fa8fd95d1e…
https://git.kernel.org/stable/c/35c62ac98d06669aa…
https://git.kernel.org/stable/c/050f010f920da17c1…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: bbedeb67a9a684f2fb78c55bd3662c400526715e , < 8acab9fc66d6f426c36968c91a979f70784945a7 (git) Affected: 377a8f500704da42ed86a4541ed930e9dcfdb2ea , < af7e25c649ed68cbad07f8185af0f31b892cbf29 (git) Affected: 6da8119e8dd542194103139812d1a4b7dcd1aedd , < 2753722612d8824d3910096f93059f669009b0f0 (git) Affected: 0b05eca9589f609e2491b528dccf683168a4cda8 , < bf5c4a8b24acb12739ebb9aea5510b007e4f5239 (git) Affected: a7d90e7b5e75d7406c889fe36e9a61ee364a00cb , < deca7746b57d982cd4f0301f4443f56780c4a048 (git) Affected: 37beb16e08cae94cc05840c7274225e3b0b38ae7 , < 10be509fa8fd95d1e47d40d1f68b0b26dfe9d572 (git) Affected: 4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca , < 35c62ac98d06669aa3f0f38b7829eaca929a611e (git) Affected: cf070fe33bfbd1a4c21236078fadb35dd223a157 , < 050f010f920da17c1044a4f174766ad553e770b6 (git)	guessed
Linux	Linux	Affected: 5.10.265 , < 5.10.267 (semver) Affected: 5.15.216 , < 5.15.218 (semver) Affected: 6.1.183 , < 6.1.185 (semver) Affected: 6.6.148 , < 6.6.151 (semver) Affected: 6.12.101 , < 6.12.103 (semver) Affected: 6.18.40 , < 6.18.44 (semver) Affected: 7.1.5 , < 7.1.8 (semver)	guessed

Show details on NVD website

JSON

To clipboard

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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"
      },
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        {
          "url": "https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6"
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      ],
      "title": "can: isotp: fix timer drain order, wakeup handling and tx_gen ordering",
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    "assignerShortName": "Linux",
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    "datePublished": "2026-09-04T17:11:05.854Z",
    "dateReserved": "2026-08-26T14:34:25.799Z",
    "dateUpdated": "2026-09-04T17:11:05.854Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/can/isotp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bbedeb67a9a684f2fb78c55bd3662c400526715e\",\"lessThan\":\"8acab9fc66d6f426c36968c91a979f70784945a7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"377a8f500704da42ed86a4541ed930e9dcfdb2ea\",\"lessThan\":\"af7e25c649ed68cbad07f8185af0f31b892cbf29\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6da8119e8dd542194103139812d1a4b7dcd1aedd\",\"lessThan\":\"2753722612d8824d3910096f93059f669009b0f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0b05eca9589f609e2491b528dccf683168a4cda8\",\"lessThan\":\"bf5c4a8b24acb12739ebb9aea5510b007e4f5239\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a7d90e7b5e75d7406c889fe36e9a61ee364a00cb\",\"lessThan\":\"deca7746b57d982cd4f0301f4443f56780c4a048\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"37beb16e08cae94cc05840c7274225e3b0b38ae7\",\"lessThan\":\"10be509fa8fd95d1e47d40d1f68b0b26dfe9d572\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca\",\"lessThan\":\"35c62ac98d06669aa3f0f38b7829eaca929a611e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cf070fe33bfbd1a4c21236078fadb35dd223a157\",\"lessThan\":\"050f010f920da17c1044a4f174766ad553e770b6\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/can/isotp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10.265\",\"lessThan\":\"5.10.267\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.216\",\"lessThan\":\"5.15.218\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.183\",\"lessThan\":\"6.1.185\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.148\",\"lessThan\":\"6.6.151\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.101\",\"lessThan\":\"6.12.103\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.40\",\"lessThan\":\"6.18.44\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.1.5\",\"lessThan\":\"7.1.8\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-05T00:25:13Z",
      "cve": "CVE-2026-80889",
      "id": "CVE-2026-80889",
      "initial_release_date": "2026-09-05T00:25:13Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80889",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80889.json",
      "version": "2"
    }
  }
}

FKIE_CVE-2026-80889

Vulnerability from fkie_nvd - Published: 2026-09-04 18:17 - Updated: 2026-09-04 18:17

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/can/isotp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8acab9fc66d6f426c36968c91a979f70784945a7",
              "status": "affected",
              "version": "bbedeb67a9a684f2fb78c55bd3662c400526715e",
              "versionType": "git"
            },
            {
              "lessThan": "af7e25c649ed68cbad07f8185af0f31b892cbf29",
              "status": "affected",
              "version": "377a8f500704da42ed86a4541ed930e9dcfdb2ea",
              "versionType": "git"
            },
            {
              "lessThan": "2753722612d8824d3910096f93059f669009b0f0",
              "status": "affected",
              "version": "6da8119e8dd542194103139812d1a4b7dcd1aedd",
              "versionType": "git"
            },
            {
              "lessThan": "bf5c4a8b24acb12739ebb9aea5510b007e4f5239",
              "status": "affected",
              "version": "0b05eca9589f609e2491b528dccf683168a4cda8",
              "versionType": "git"
            },
            {
              "lessThan": "deca7746b57d982cd4f0301f4443f56780c4a048",
              "status": "affected",
              "version": "a7d90e7b5e75d7406c889fe36e9a61ee364a00cb",
              "versionType": "git"
            },
            {
              "lessThan": "10be509fa8fd95d1e47d40d1f68b0b26dfe9d572",
              "status": "affected",
              "version": "37beb16e08cae94cc05840c7274225e3b0b38ae7",
              "versionType": "git"
            },
            {
              "lessThan": "35c62ac98d06669aa3f0f38b7829eaca929a611e",
              "status": "affected",
              "version": "4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca",
              "versionType": "git"
            },
            {
              "lessThan": "050f010f920da17c1044a4f174766ad553e770b6",
              "status": "affected",
              "version": "cf070fe33bfbd1a4c21236078fadb35dd223a157",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/can/isotp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5.10.267",
              "status": "affected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.218",
              "status": "affected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.185",
              "status": "affected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.151",
              "status": "affected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.103",
              "status": "affected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.44",
              "status": "affected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThan": "7.1.8",
              "status": "affected",
              "version": "7.1.5",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-80889",
  "lastModified": "2026-09-04T18:17:56.910",
  "metrics": {},
  "published": "2026-09-04T18:17:56.910",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/050f010f920da17c1044a4f174766ad553e770b6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/10be509fa8fd95d1e47d40d1f68b0b26dfe9d572"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2753722612d8824d3910096f93059f669009b0f0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/35c62ac98d06669aa3f0f38b7829eaca929a611e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8acab9fc66d6f426c36968c91a979f70784945a7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/af7e25c649ed68cbad07f8185af0f31b892cbf29"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bf5c4a8b24acb12739ebb9aea5510b007e4f5239"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/deca7746b57d982cd4f0301f4443f56780c4a048"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-R952-5653-4WQ2

Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 18:31

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-80889"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T18:17:56Z",
    "severity": null
  },
  "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\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.",
  "id": "GHSA-r952-5653-4wq2",
  "modified": "2026-09-04T18:31:33Z",
  "published": "2026-09-04T18:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80889"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-80889 (GCVE-0-2026-80889)

FKIE_CVE-2026-80889

GHSA-R952-5653-4WQ2

Tags

Sightings

Nomenclature