drm/vc4: Zero the tile state data array before each BIN job

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Summary

CVECVE-2026-74453
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:49 UTC
Updated2026-08-15 13:17:49 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/vc4: Zero the tile state data array before each BIN job The binner BO is a single 16MB buffer split into 512KB slots that are handed out to jobs at submission time and recycled as jobs complete, without ever being cleared. Each slot holds the job's Tile State Data Array (TSDA) at its start, followed by the tile allocation pool. While the tile allocation pool is only walked by the render thread through branches the binner generated during the current job, the TSDA is the PTB's own per-tile bookkeeping and is consumed by the hardware itself. Although the kernel sets the "Auto-initialise Tile State Data Array" flag in the tile binning mode configuration, the PTB demonstrably still acts on stale tile state left by the slot's previous user: the binner ends up creating invalid command streams with invalid primitive streams and branches, which can cause GPU hangs as observed in [1][2]. Zero the TSDA when the job's binning slot is configured. This clears 48 bytes per tile (~24KB for a 1080p frame) in the submission path, and guarantees the PTB never sees another job's tile state. The tile count is only checked for being non-zero today, so the 8-bit fields it comes from can describe a tile state array almost six times larger than the slot it has to live in. Bound it before the slot is handed out, since such size decides how much of the slot is left for the tile alloc pool.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 f5802be65535f8818af7191159cf8c11f48ab2a2 git Not specified
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 0e858422df2334165293ea742da9fbb2e51f2739 git Not specified
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 57667eb7548faaac396c6e39f3b4444dab5b097c git Not specified
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 a75c8f365e209aa9bb927b0942a7840152d44892 git Not specified
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 48a570c964d8e37d353381e4195106277e17f5cb git Not specified
CNA Linux Linux affected 4.13 Not specified
CNA Linux Linux unaffected 4.13 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f5802be65535f8818af7191159cf8c11f48ab2a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/57667eb7548faaac396c6e39f3b4444dab5b097c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a75c8f365e209aa9bb927b0942a7840152d44892 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48a570c964d8e37d353381e4195106277e17f5cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e858422df2334165293ea742da9fbb2e51f2739 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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