CVE-2026-68204

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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0a820f03727b509b887f3216a574062948761f34
https://git.kernel.org/stable/c/492c97cb50feaa60ccd7792d3d6b904ed8ec61bf
https://git.kernel.org/stable/c/6a5bc8aea111ccbca71ef2b9c868d5c81f2e89de
https://git.kernel.org/stable/c/a9cd0e8fb0b21faaa71199d9d3feb305c18ff576
https://git.kernel.org/stable/c/abaec6747304581f8d4a9936352fa10e13325f07
https://git.kernel.org/stable/c/bbc96bc75de0fcd9bb6ac48798b206e3b09ec865
https://git.kernel.org/stable/c/c2d1a2130c93f6d758af58590b86b2254c7a1dec
https://git.kernel.org/stable/c/daf2d92669b4a659d805d88d811161c70cd325ee

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-10 13:20

Updated : 2026-08-19 17:20

NVD link : CVE-2026-68204

Mitre link : CVE-2026-68204

CVE.ORG link : CVE-2026-68204

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-68204", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9", "lessThan": "0a820f03727b509b887f3216a574062948761f34", "versionType": "git"}, {"status": "affected", "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9", "lessThan": "bbc96bc75de0fcd9bb6ac48798b206e3b09ec865", "versionType": "git"}, {"status": "affected", "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9", "lessThan": "6a5bc8aea111ccbca71ef2b9c868d5c81f2e89de", "versionType": "git"}, {"status": "affected", "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9", "lessThan": "a9cd0e8fb0b21faaa71199d9d3feb305c18ff576", "versionType": "git"}, {"status": "affected", "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9", "lessThan": "abaec6747304581f8d4a9936352fa10e13325f07", "versionType": "git"}, {"status": "affected", "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9", "lessThan": "492c97cb50feaa60ccd7792d3d6b904ed8ec61bf", "versionType": "git"}, {"status": "affected", "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9", "lessThan": "daf2d92669b4a659d805d88d811161c70cd325ee", "versionType": "git"}, {"status": "affected", "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9", "lessThan": "c2d1a2130c93f6d758af58590b86b2254c7a1dec", "versionType": "git"}], "programFiles": ["drivers/media/test-drivers/vivid/vivid-ctrls.c", "drivers/media/test-drivers/vivid/vivid-vid-cap.c", "drivers/media/test-drivers/vivid/vivid-vid-out.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.18"}, {"status": "unaffected", "version": "0", "lessThan": "3.18", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.148", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.101", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.42", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.6", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/media/test-drivers/vivid/vivid-ctrls.c", "drivers/media/test-drivers/vivid/vivid-vid-cap.c", "drivers/media/test-drivers/vivid/vivid-vid-out.c"], "defaultStatus": "affected"}]}], "published": "2026-08-10T13:20:08.013", "references": [{"url": "https://git.kernel.org/stable/c/0a820f03727b509b887f3216a574062948761f34", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/492c97cb50feaa60ccd7792d3d6b904ed8ec61bf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6a5bc8aea111ccbca71ef2b9c868d5c81f2e89de", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a9cd0e8fb0b21faaa71199d9d3feb305c18ff576", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/abaec6747304581f8d4a9936352fa10e13325f07", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bbc96bc75de0fcd9bb6ac48798b206e3b09ec865", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c2d1a2130c93f6d758af58590b86b2254c7a1dec", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/daf2d92669b4a659d805d88d811161c70cd325ee", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: vivid: check for vb2_is_busy() when toggling caps\n\nThe vivid_update_format_cap/out() functions must only be called if the\ncapture/output queue are not busy. But for the controls that select\nthe CROP/COMPOSE/SCALE capability that is not checked.\n\nOnly when streaming starts will they be set to 'grabbed' and it is\nimpossible to change the control, but between REQBUFS and STREAMON you\nare still allowed to set these controls. Since vivid_update_format_cap/out\nwill change the format, this can cause unexpected results.\n\nBesides adding these checks, also add a WARN_ON in\nvivid_update_format_cap/out() if the queue is busy.\n\nI'm 90% certain that this is the cause of this syzbot bug:\n\nhttps://syzkaller.appspot.com/bug?extid=dac8f5eaa46837e97b89\n\nBut since we never have reproducers, it is hard to be certain. In any case,\nthese checks are needed regardless."}], "lastModified": "2026-08-19T17:20:36.397", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}