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-ibmUpgrade linux-image-generic-7.0Upgrade linux-image-oem-7.0Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-7.0.0-38-generic-64kUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-7.0.0-1008-gkeUpgrade linux-image-7.0.0-1008-gke-64kUpgrade linux-image-7.0.0-1015-oemUpgrade linux-image-awsUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-7.0.0-1014-awsUpgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-1014-gcpUpgrade linux-image-7.0.0-1014-gcp-64kUpgrade linux-image-aws-64kUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-generic-64k-7.0Upgrade linux-image-oracle-7.0Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-virtualUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-gcpUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-oracle-64kUpgrade linux-image-azure-fde-lts-26.04Upgrade linux-image-realtime-64kUpgrade linux-image-azure-7.0Upgrade linux-image-7.0.0-1017-azureUpgrade linux-image-generic-64kUpgrade linux-image-7.0.0-38-genericUpgrade linux-image-7.0.0-1014-aws-64kUpgrade linux-image-aws-7.0Upgrade linux-image-azure-lts-26.04Upgrade linux-image-7.0.0-1013-oracle-64kUpgrade linux-image-7.0.0-38-realtime-64kUpgrade linux-image-oracleUpgrade linux-image-ibm-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gke-64k-7.0Upgrade linux-image-azure-fdeUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-gkeUpgrade linux-image-oem-26.04aUpgrade linux-image-genericUpgrade linux-image-gke-64kUpgrade linux-image-gke-7.0Upgrade linux-image-7.0.0-38-realtimeUpgrade linux-image-7.0.0-1016-azure-fdeUpgrade linux-image-realtimeUpgrade linux-image-7.0.0-1015-ibmUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-azure-fde-7.0Upgrade linux-image-7.0.0-1013-oracleUpgrade linux-image-gcp-64kUpgrade linux-image-azure | Oct 7, 2026 | Oct 6, 2026 |
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