SB20260812325 - Improper resource shutdown or release in Linux kernel usb pwc driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-68217)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource shutdown or release in start_streaming() in the pwc USB media driver when handling a start_streaming() failure after isochronous URB submission. A local user can trigger a streaming start failure to cause a denial of service.

The issue occurs because a buffer moved from queued_bufs into fill_buf is not drained on the error path, which leads to a WARN_ON(owned_by_drv_count).

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5d4812668b03f823b5044789d6aa77fe56b42587
• https://git.kernel.org/stable/c/906e410dcffbbd99fb4081abab817a830033aa28
• https://git.kernel.org/stable/c/9afd605dcd96c7a45f338eded1de16679b30e1df
• https://git.kernel.org/stable/c/a56e7641e09bd80b976e944ae759109b86fd5b38
• https://git.kernel.org/stable/c/acc789b2173070638cad89c2b61d33ed338be0dd