CVE-2026-80659

/// Technical description

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

mmc: vub300: defer reset until cmd_mutex is unlocked

vub300_cmndwork_thread() holds cmd_mutex while it sends a command and

waits for the command response. If the response wait times out,

__vub300_command_response() kills the command URBs and then synchronously

resets the USB device through usb_reset_device().

That reset path re-enters the driver through vub300_pre_reset(), which

also takes cmd_mutex. The worker therefore tries to acquire the same

mutex recursively while it is still holding it from the command path.

This issue was found by our static analysis tool and then manually

reviewed against the current tree.

The grounded PoC kept the real worker and timeout/reset carrier:

vub300_cmndwork_thread()

__vub300_command_response()

usb_lock_device_for_reset()

usb_reset_device()

vub300_pre_reset()

Lockdep reported the same-task recursive acquisition on cmd_mutex:

WARNING: possible recursive locking

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

/// References