CVE-2026-23281

Technical Description

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

wifi: libertas: fix use-after-free in lbs_free_adapter()

The lbs_free_adapter() function uses timer_delete() (non-synchronous)

for both command_timer and tx_lockup_timer before the structure is

freed. This is incorrect because timer_delete() does not wait for

any running timer callback to complete.

If a timer callback is executing when lbs_free_adapter() is called,

the callback will access freed memory since lbs_cfg_free() frees the

containing structure immediately after lbs_free_adapter() returns.

Both timer callbacks (lbs_cmd_timeout_handler and lbs_tx_lockup_handler)

access priv->driver_lock, priv->cur_cmd, priv->dev, and other fields,

which would all be use-after-free violations.

Use timer_delete_sync() instead to ensure any running timer callback

has completed before returning.

This bug was introduced in commit 8f641d93c38a ("libertas: detect TX

lockups and reset hardware") where del_timer() was used instead

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References