CVE-2026-68216

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").