CVE-2026-68204

media: vivid: check for vb2_is_busy() when toggling caps

State: Published
Severity: 7.8 High
Published: Aug 10, 2026
Updated: Aug 19, 2026
Reserved: Jul 30, 2026

Description

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

media: vivid: check for vb2_is_busy() when toggling caps

The vivid_update_format_cap/out() functions must only be called if the capture/output queue are not busy. But for the controls that select the CROP/COMPOSE/SCALE capability that is not checked.

Only when streaming starts will they be set to 'grabbed' and it is impossible to change the control, but between REQBUFS and STREAMON you are still allowed to set these controls. Since vivid_update_format_cap/out will change the format, this can cause unexpected results.

Besides adding these checks, also add a WARN_ON in vivid_update_format_cap/out() if the queue is busy.

I'm 90% certain that this is the cause of this syzbot bug:

https://syzkaller.appspot.com/bug?extid=dac8f5eaa46837e97b89

But since we never have reproducers, it is hard to be certain. In any case, these checks are needed regardless.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before 0a820f03727b509b887f3216a574062948761f34Affected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before bbc96bc75de0fcd9bb6ac48798b206e3b09ec865Affected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before 6a5bc8aea111ccbca71ef2b9c868d5c81f2e89deAffected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before a9cd0e8fb0b21faaa71199d9d3feb305c18ff576Affected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before abaec6747304581f8d4a9936352fa10e13325f07Affected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before 492c97cb50feaa60ccd7792d3d6b904ed8ec61bfAffected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before daf2d92669b4a659d805d88d811161c70cd325eeAffected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before c2d1a2130c93f6d758af58590b86b2254c7a1decAffected
LinuxLinux	3.18Affected before 3.18Not affected 5.10.265 through 5.10.Not affected 5.15.216 through 5.15.Not affected 6.1.183 through 6.1.Not affected 6.6.148 through 6.6.Not affected 6.12.101 through 6.12.Not affected 6.18.42 through 6.18.Not affected 7.1.6 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before 0a820f03727b509b887f3216a574062948761f34Affected
73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before bbc96bc75de0fcd9bb6ac48798b206e3b09ec865Affected
73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before 6a5bc8aea111ccbca71ef2b9c868d5c81f2e89deAffected
73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before a9cd0e8fb0b21faaa71199d9d3feb305c18ff576Affected
73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before abaec6747304581f8d4a9936352fa10e13325f07Affected
73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before 492c97cb50feaa60ccd7792d3d6b904ed8ec61bfAffected
73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before daf2d92669b4a659d805d88d811161c70cd325eeAffected
73c3f48230cda01402ae189b05d56f1f7e0d53c9 to before c2d1a2130c93f6d758af58590b86b2254c7a1decAffected

LinuxLinux

3.18Affected
before 3.18Not affected
5.10.265 through 5.10.*Not affected
5.15.216 through 5.15.*Not affected
6.1.183 through 6.1.*Not affected
6.6.148 through 6.6.*Not affected
6.12.101 through 6.12.*Not affected
6.18.42 through 6.18.*Not affected
7.1.6 through 7.1.*Not affected
7.2 and laterNot affected

References

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