CVE-2026-74453
Received Received - Intake

BaseFortify

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In 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.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74453
EUVD
EUVD-2026-59646

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves improper handling of tile state data in the drm/vc4 graphics driver. The binner buffer, which holds job data, is reused without clearing previous tile state data arrays (TSDA). This can cause the hardware to process stale data, leading to invalid command streams and GPU hangs.

Detection Guidance

This vulnerability is specific to the Linux kernel's drm/vc4 driver and relates to GPU memory handling. Detection requires checking kernel logs for GPU hangs or errors related to the vc4 driver. Commands like 'dmesg | grep vc4' or 'journalctl -k | grep -i vc4' may show relevant errors. Ensure your kernel version is up-to-date to verify if the fix is applied.

Impact Analysis

This vulnerability can cause system instability, such as GPU hangs or crashes, during graphics-intensive tasks. It may lead to application freezes or require system reboots to recover functionality.

Mitigation Strategies

Update your Linux kernel to the latest stable version where this vulnerability is patched. If updating is not immediately possible, monitor GPU-related errors in logs and avoid running untrusted graphics workloads. Kernel patches addressing this issue should be applied as soon as available.

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