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

wifi: cfg80211: use wiphy work for socket owner autodisconnect

nl80211_netlink_notify() walks the cfg80211 wireless device list when a
NETLINK_GENERIC socket is released. If the socket owns a connection, the
notifier queues the embedded wdev->disconnect_wk work item.

That work is a plain work_struct today. NETDEV_GOING_DOWN cancels it, but a
NETLINK_URELEASE notifier that already observed conn_owner_nlportid can
queue it after that cancel returns. _cfg80211_unregister_wdev() then
removes the wdev from the list and waits for RCU readers, but
synchronize_net() does not drain work queued by such a reader.

Make the autodisconnect work a wiphy_work instead. The callback already
needs the wiphy mutex, and wiphy_work runs under that mutex. This lets
teardown cancel pending autodisconnect work while holding the mutex,
without a cancel_work_sync() vs. worker locking concern.

Also cancel the wiphy work after list_del_rcu() and synchronize_net(). Any
NETLINK_URELEASE notifier that had already reached the wdev list has then
either queued the work and it is removed, or can no longer find the wdev.
Published: 2026-08-10
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The Linux kernel cfg80211 wireless subsystem suffered a race condition where an autodisconnect work item could be queued after its underlying wdev structure had been removed. Because the work was executed as a plain work_struct, the kernel could reference freed memory, potentially leading to a crash or denial of service. This use‑after‑free scenario is classified as CWE‑367, representing a race condition that allows a dangling reference to be used. The flaw arises from the handling of NETLINK_GENERIC socket releases while a wireless connection is active.

Affected Systems

All Linux kernel distributions are affected; specific version information is not provided. The vulnerability manifests in the core cfg80211 subsystem, which is included in every Linux kernel release that supports wireless networking.

Risk and Exploitability

There is no publicly known exploit and the EPSS score of < 1% implies a low expected exploitation probability. The CVSS score of 7.8 indicates high severity; this risk arises from a race condition that can result in a kernel crash when a NETLINK_GENERIC socket tied to a wireless interface is released while the device is in the process of an autodisconnect. The likely attack vector is local: an attacker would need the ability to open and close a NETLINK socket that interacts with cfg80211, potentially through userspace applications. Successful exploitation would lead to a denial of service rather than privilege escalation or remote code execution.

Generated by OpenCVE AI on August 14, 2026 at 01:37 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade the kernel to a version that includes the patch identified by commit 0c2ed186bbe14304415476d6707b747dddcd8583.
  • Reboot the system to load the updated kernel.
  • If an immediate kernel update is not possible, disable wireless interfaces or restrict NETLINK_GENERIC socket usage that interacts with cfg80211 until the vulnerability is remediated.

Generated by OpenCVE AI on August 14, 2026 at 01:37 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 13 Aug 2026 23:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Wed, 12 Aug 2026 19:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362
CWE-399

Wed, 12 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-367
References
Metrics threat_severity

None

cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate


Mon, 10 Aug 2026 17:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362
CWE-399

Mon, 10 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: use wiphy work for socket owner autodisconnect nl80211_netlink_notify() walks the cfg80211 wireless device list when a NETLINK_GENERIC socket is released. If the socket owns a connection, the notifier queues the embedded wdev->disconnect_wk work item. That work is a plain work_struct today. NETDEV_GOING_DOWN cancels it, but a NETLINK_URELEASE notifier that already observed conn_owner_nlportid can queue it after that cancel returns. _cfg80211_unregister_wdev() then removes the wdev from the list and waits for RCU readers, but synchronize_net() does not drain work queued by such a reader. Make the autodisconnect work a wiphy_work instead. The callback already needs the wiphy mutex, and wiphy_work runs under that mutex. This lets teardown cancel pending autodisconnect work while holding the mutex, without a cancel_work_sync() vs. worker locking concern. Also cancel the wiphy work after list_del_rcu() and synchronize_net(). Any NETLINK_URELEASE notifier that had already reached the wdev list has then either queued the work and it is removed, or can no longer find the wdev.
Title wifi: cfg80211: use wiphy work for socket owner autodisconnect
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-17T05:04:54.332Z

Reserved: 2026-07-30T09:28:09.390Z

Link: CVE-2026-68404

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-10T13:20:33.947

Modified: 2026-08-17T06:17:49.230

Link: CVE-2026-68404

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-08-10T12:04:24Z

Links: CVE-2026-68404 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-14T01:45:08Z

Weaknesses
  • CWE-367

    Time-of-check Time-of-use (TOCTOU) Race Condition