CVE-2026-68231: media: airspy: Return queued buffers on start_streaming() failure

From: Greg Kroah-Hartman <[email protected]>

Description
===========

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

media: airspy: 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.

airspy_start_streaming() returned -ENODEV early when the USB device had
been disconnected (s->udev == NULL) without returning any buffers that
buf_queue() had already accepted.  Take v4l2_lock first and jump to the
existing err_clear_bit label, which already drains s->queued_bufs via
vb2_buffer_done(..., VB2_BUF_STATE_QUEUED) before unlocking.

This mirrors the uvcvideo fix in commit 4cf3b6fd54eb ("media: uvcvideo:
Return queued buffers on start_streaming() failure").

The Linux kernel CVE team has assigned CVE-2026-68231 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 6.6.148 with commit 877686a74ecdc93dcaee09dbac566e819059c9e7
	Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 6.12.101 with commit cd42623d698b59f1fe5768f78a4101c28d5feb2e
	Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 6.18.42 with commit 73bd2779865372b1017d4f555b45270aa2d0d710
	Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 7.1.6 with commit 170fcc945bc094b1c956bf555c070692826a3eff
	Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 7.2-rc1 with commit 04344d0b4929caa94c0df72f767752aa0935ef5d

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-68231
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/media/usb/airspy/airspy.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/877686a74ecdc93dcaee09dbac566e819059c9e7
	https://git.kernel.org/stable/c/cd42623d698b59f1fe5768f78a4101c28d5feb2e
	https://git.kernel.org/stable/c/73bd2779865372b1017d4f555b45270aa2d0d710
	https://git.kernel.org/stable/c/170fcc945bc094b1c956bf555c070692826a3eff
	https://git.kernel.org/stable/c/04344d0b4929caa94c0df72f767752aa0935ef5d