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In 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]/
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Aug 20, 2026 | Aug 15, 2026 |
| Ubuntu | — | Upgrade linux-image-7.0.0-38-generic-64kUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-1014-gcp-64kUpgrade linux-image-virtualUpgrade linux-image-7.0.0-1008-gke-64kUpgrade linux-image-7.0.0-1017-azureUpgrade linux-image-gcpUpgrade linux-image-ibmUpgrade linux-image-7.0.0-1014-awsUpgrade linux-image-generic-64kUpgrade linux-image-awsUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-generic-64k-7.0Upgrade linux-image-7.0.0-1014-gcpUpgrade linux-image-7.0.0-38-genericUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-oracle-7.0Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-aws-64kUpgrade linux-image-oem-7.0Upgrade linux-image-7.0.0-1014-aws-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-virtual-7.0Upgrade linux-image-azure-fde-lts-26.04Upgrade linux-image-azure-7.0Upgrade linux-image-realtime-64kUpgrade linux-image-7.0.0-1008-gkeUpgrade linux-image-generic-7.0Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-7.0.0-1015-oemUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-realtime-7.0Upgrade linux-image-7.0.0-38-realtimeUpgrade linux-image-gkeUpgrade linux-image-azure-fdeUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-oem-26.04aUpgrade linux-image-gke-7.0Upgrade linux-image-genericUpgrade linux-image-gcp-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-azure-lts-26.04Upgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-38-realtime-64kUpgrade linux-image-gke-64k-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-1015-ibmUpgrade linux-image-realtimeUpgrade linux-image-7.0.0-1016-azure-fdeUpgrade linux-image-gke-64kUpgrade linux-image-7.0.0-1013-oracleUpgrade linux-image-azure-fde-7.0Upgrade linux-image-7.0.0-1013-oracle-64kUpgrade linux-image-gcp-64kUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-azureUpgrade linux-image-oracleUpgrade linux-image-ibm-7.0 | Oct 7, 2026 | Oct 6, 2026 |
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