CVE-2026-74453 Linux CVE debrief

Who should care

Linux kernel users and administrators, particularly those responsible for maintaining and securing Linux-based systems, should be aware of this vulnerability. The vulnerability affects the drm/vc4 component of the Linux kernel and could potentially cause GPU hangs if not addressed. Operators, platform administrators, and security teams must prioritize patching and monitoring to prevent operational impacts. Vulnerability management and security teams should review and apply kernel patches for drm/vc4, monitor system logs for potential GPU hangs, and ensure their systems are updated with the latest kernel patches to mitigate this vulnerability effectively. Compensating controls, such as enhanced monitoring, should be considered for exposed systems while remediation is scheduled and verified. Asset inventory management is crucial to identify and prioritize affected systems for remediation. Rolling back change windows and source tracking can help in managing the remediation process efficiently. Monitoring and detection capabilities should be reviewed to ensure they can identify potential issues related to this vulnerability. Implementing a robust patch management process and maintaining an up-to-date inventory of assets are essential for minimizing the risk associated with this vulnerability. Additionally, verifying the effectiveness of remediation efforts through retesting and exception tracking is vital to ensure that the vulnerability is fully mitigated.

Technical summary

The vulnerability is related to the drm/vc4 component of the Linux kernel. 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. Zeroing the TSDA when the job's binning slot is configured 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.

Defensive priority

This vulnerability affects the Linux kernel and could potentially cause GPU hangs. Users should ensure their systems are updated with the latest kernel patches.

Recommended defensive actions

• Update the Linux kernel to the latest version
• Review and apply kernel patches for drm/vc4
• Monitor system logs for potential GPU hangs
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The vulnerability is related to the drm/vc4 component of the Linux kernel. 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.

Official resources