drm/vc4: Supply the overflow slot size in BPOS, not the whole bin BO size

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Summary

CVECVE-2026-74454
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:50 UTC
Updated2026-08-15 13:17:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/vc4: Supply the overflow slot size in BPOS, not the whole bin BO size vc4_overflow_mem_work() points BPOA at a 512KB slot inside the 16MB binner BO, but writes the size of the whole BO to BPOS. On every binner out-of-memory event the PTB is therefore authorized to write tile lists across all the other slots (which may hold the tile state, tile alloc and overflow memory of in-flight jobs) and, for any slot but the first, past the end of the binner BO into unrelated CMA memory. Since CMA pages are recycled into page cache and user allocations, this is arbitrary memory corruption by GPU DMA. In practice it shows up as GPU hangs with corrupted control list pointers, userspace heap corruption, a GPU that stays permanently wedged after the first hang, and occasional full system crashes, whenever a job overflows the initial binner slot. The bug dates back to the conversion from a dedicated overflow BO (where writing the full BO size was correct) to the slotted binner BO.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 2f2291a119e9a8b696ae8bb36e86b75d272ceaea git Not specified
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 0badb30871004d34df87be33e853536f0b69885f git Not specified
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 6cd5acf6f87c073622bd61e38fe99c47365cda9c git Not specified
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 1e33ca7f44be64beed2735bb76b86eb65ba8c05b git Not specified
CNA Linux Linux affected 553c942f8b2cbc7394b4d4fa2f848b23a8f07451 6395789e4739aa5177bbec0fa0f07ccc38d249b0 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/6cd5acf6f87c073622bd61e38fe99c47365cda9c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6395789e4739aa5177bbec0fa0f07ccc38d249b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2f2291a119e9a8b696ae8bb36e86b75d272ceaea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0badb30871004d34df87be33e853536f0b69885f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1e33ca7f44be64beed2735bb76b86eb65ba8c05b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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