GHSA-266H-P8PW-28F4
Vulnerability from github – Published: 2026-01-31 12:30 – Updated: 2026-03-25 21:30In 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.
{
"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": "MODERATE"
},
"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": "2026-03-25T21:30:24Z",
"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": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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