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

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Summary

CVECVE-2026-68204
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:08 UTC
Updated2026-08-10 13:20:08 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 a9cd0e8fb0b21faaa71199d9d3feb305c18ff576 git Not specified
CNA Linux Linux affected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 abaec6747304581f8d4a9936352fa10e13325f07 git Not specified
CNA Linux Linux affected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 492c97cb50feaa60ccd7792d3d6b904ed8ec61bf git Not specified
CNA Linux Linux affected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 daf2d92669b4a659d805d88d811161c70cd325ee git Not specified
CNA Linux Linux affected 73c3f48230cda01402ae189b05d56f1f7e0d53c9 c2d1a2130c93f6d758af58590b86b2254c7a1dec git Not specified
CNA Linux Linux affected 3.18 Not specified
CNA Linux Linux unaffected 3.18 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/daf2d92669b4a659d805d88d811161c70cd325ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a9cd0e8fb0b21faaa71199d9d3feb305c18ff576 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c2d1a2130c93f6d758af58590b86b2254c7a1dec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/abaec6747304581f8d4a9936352fa10e13325f07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/492c97cb50feaa60ccd7792d3d6b904ed8ec61bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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