CVE-2026-74454

Technical Description

In 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 t

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References