drm/fb-helper: Only consider active CRTCs for vblank sync

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72313
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:04 UTC
Updated2026-08-15 06:22:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/fb-helper: Only consider active CRTCs for vblank sync Only synchronize fbdev output to the vblank of an active CRTC. Go over the list of CRTCs and pick the first that matches. Fixes warnings as the one shown below [ 77.201354] WARNING: drivers/gpu/drm/drm_vblank.c:1320 at drm_crtc_wait_one_vblank+0x194/0x1cc [drm], CPU#1: kworker/1:7/1867 [ 77.201354] omapdrm omapdrm.0: [drm] vblank wait timed out on crtc 0 This currently happens if the fbdev output is not on CRTC 0. Atomic and non-atomic drivers require distinct code paths. As for other fbdev operations, implement both and select the correct one at runtime. Not finding an active CRTC is not a bug. Do not wait in this case, but flush the display update as before. v4: - avoid possible deadlocks with locking context (Sashiko) v3: - drop excessive state validation (Jani) - acquire plane and CRTC mutices (Sashiko) v2: - move look-up code into separate helper - support drivers with legacy modesetting v1: - see https://lore.kernel.org/dri-devel/[email protected]/

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.098650000 (date 2026-08-15)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d8c4bddcd8bcb41885d3db2ba18c840c411564c2 7d84acf641afb68aa8efe40815ef43779ddb12fd git Not specified
CNA Linux Linux affected d8c4bddcd8bcb41885d3db2ba18c840c411564c2 06c2b8d7ea2bcb014dd974fc3bc6d128d65d7477 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7d84acf641afb68aa8efe40815ef43779ddb12fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/06c2b8d7ea2bcb014dd974fc3bc6d128d65d7477 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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