Vulnerability-Lookup

GHSA-266H-P8PW-28F4

Vulnerability from github – Published: 2026-01-31 12:30 – Updated: 2026-01-31 12:30

Details

In the Linux kernel, the following vulnerability has been resolved:

can: j1939: make j1939_session_activate() fail if device is no longer registered

syzbot is still reporting

unregister_netdevice: waiting for vcan0 to become free. Usage count = 2

even after commit 93a27b5891b8 ("can: j1939: add missing calls in NETDEV_UNREGISTER notification handler") was added. A debug printk() patch found that j1939_session_activate() can succeed even after j1939_cancel_active_session() from j1939_netdev_notify(NETDEV_UNREGISTER) has completed.

Since j1939_cancel_active_session() is processed with the session list lock held, checking ndev->reg_state in j1939_session_activate() with the session list lock held can reliably close the race window.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-71182"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-31T12:16:03Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: make j1939_session_activate() fail if device is no longer registered\n\nsyzbot is still reporting\n\n  unregister_netdevice: waiting for vcan0 to become free. Usage count = 2\n\neven after commit 93a27b5891b8 (\"can: j1939: add missing calls in\nNETDEV_UNREGISTER notification handler\") was added. A debug printk() patch\nfound that j1939_session_activate() can succeed even after\nj1939_cancel_active_session() from j1939_netdev_notify(NETDEV_UNREGISTER)\nhas completed.\n\nSince j1939_cancel_active_session() is processed with the session list lock\nheld, checking ndev-\u003ereg_state in j1939_session_activate() with the session\nlist lock held can reliably close the race window.",
  "id": "GHSA-266h-p8pw-28f4",
  "modified": "2026-01-31T12:30:11Z",
  "published": "2026-01-31T12:30:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71182"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46ca9dc978923c5e1247a9e9519240ba7ace413c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d5602236f5db19e8b337a2cd87a90ace5ea776d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78d87b72cebe2a993fd5b017e9f14fb6278f2eae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/79dd3f1d9dd310c2af89b09c71f34d93973b200f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3a4316e3c746af415c0fd6c6d489ad13f53714d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebb0dfd718dd31c8d3600612ca4b7207ec3d923a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-71182 (GCVE-0-2025-71182)

Vulnerability from cvelistv5 – Published: 2026-01-31 11:38 – Updated: 2026-02-09 08:36

Title

can: j1939: make j1939_session_activate() fail if device is no longer registered

Summary

In the Linux kernel, the following vulnerability has been resolved: can: j1939: make j1939_session_activate() fail if device is no longer registered syzbot is still reporting unregister_netdevice: waiting for vcan0 to become free. Usage count = 2 even after commit 93a27b5891b8 ("can: j1939: add missing calls in NETDEV_UNREGISTER notification handler") was added. A debug printk() patch found that j1939_session_activate() can succeed even after j1939_cancel_active_session() from j1939_netdev_notify(NETDEV_UNREGISTER) has completed. Since j1939_cancel_active_session() is processed with the session list lock held, checking ndev->reg_state in j1939_session_activate() with the session list lock held can reliably close the race window.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/ebb0dfd718dd31c8d…
	https://git.kernel.org/stable/c/c3a4316e3c746af41…
	https://git.kernel.org/stable/c/46ca9dc978923c5e1…
	https://git.kernel.org/stable/c/78d87b72cebe2a993…
	https://git.kernel.org/stable/c/ba6f0d1832eeb5eb3…
	https://git.kernel.org/stable/c/79dd3f1d9dd310c2a…
	https://git.kernel.org/stable/c/5d5602236f5db19e8…

Impacted products

Vendor

Product

Version

Linux

Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < ebb0dfd718dd31c8d3600612ca4b7207ec3d923a (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < c3a4316e3c746af415c0fd6c6d489ad13f53714d (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 46ca9dc978923c5e1247a9e9519240ba7ace413c (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 78d87b72cebe2a993fd5b017e9f14fb6278f2eae (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536 (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 79dd3f1d9dd310c2af89b09c71f34d93973b200f (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 5d5602236f5db19e8b337a2cd87a90ace5ea776d (git)

Linux

Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.161 , ≤ 6.1.* (semver)
Unaffected: 6.6.121 , ≤ 6.6.* (semver)
Unaffected: 6.12.66 , ≤ 6.12.* (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

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              "status": "unaffected",
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:36:06.320Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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    "datePublished": "2026-01-31T11:38:55.157Z",
    "dateReserved": "2026-01-31T11:36:51.185Z",
    "dateUpdated": "2026-02-09T08:36:06.320Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-266H-P8PW-28F4

CVE-2025-71182 (GCVE-0-2025-71182)

Tags

Sightings

Nomenclature