CVE-2026-68216

/// Technical description

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

media: pwc: Return queued buffers on start_streaming() failure

The vb2 framework hands buffers to the driver via buf_queue() before

calling start_streaming(). If start_streaming() returns an error

without first returning those buffers via vb2_buffer_done(),

vb2_start_streaming() fires WARN_ON(owned_by_drv_count) and the queued

buffers leak.

pwc's start_streaming() had two early returns that hit this trap:

-ENODEV when the USB device was already disconnected, and -ERESTARTSYS

when mutex_lock_interruptible() was interrupted by a signal. Call the

existing pwc_cleanup_queued_bufs() helper with VB2_BUF_STATE_QUEUED

before returning (matching the state already used by the

pwc_isoc_init() error path in the same function).

This mirrors the uvcvideo fix in commit 4cf3b6fd54eb ("media: uvcvideo:

Return queued buffers on start_streaming() failure").

/// 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