CVE-2026-68213

/// Technical description

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

media: rtl2832_sdr: 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.

rtl2832_sdr_start_streaming() had multiple error paths that hit this

trap: two direct early returns (-ENODEV, -ERESTARTSYS), plus six

`goto err` paths covering subdev s_power, tuner setup, ADC setup,

stream-buffer allocation, urb allocation, and urb submission failures.

None of them returned the queued buffers.

The original function had no distinct success exit and fell straight

through into the err label, which previously only did mutex_unlock and

"return ret". Adding queued-buffer cleanup at err must therefore be

paired with an explicit success return; otherwise ever

/// 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