CVE-2026-68209

/// Technical description

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

media: sun4i-csi: 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.

sun4i_csi_start_streaming() returned -EINVAL when no matching CSI

format could be found, before any setup (scratch buffer allocation,

pipeline start) had been performed. The remaining error paths already

converge on the err_clear_dma_queue label, which calls

return_all_buffers(..., VB2_BUF_STATE_QUEUED) under csi->qlock. Jump

to that label directly: the intermediate err_disable_device /

err_disable_pipeline / err_free_scratch_buffer labels are skipped,

which is correct because nothing they would undo has happened yet.

This mirrors the uvcvideo fix in commit 4cf3b6fd54eb

/// 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