CVE-2021-29256 Arm CVE debrief

Who should care

Organizations that deploy or manage devices using the Arm Mali GPU kernel driver should care most, especially security teams responsible for patching, asset inventory, and endpoint or embedded-device remediation. Any fleet owner that cannot quickly confirm whether affected driver versions are present should treat this as a priority.

Technical summary

The issue is a use-after-free in the Arm Mali GPU kernel driver, which is a memory-safety flaw in kernel-space code. CISA has classified it as a known exploited vulnerability, so defenders should assume exposure can be actively targeted and should prioritize remediation based on presence of the affected driver and the inability to confirm a safe version.

Defensive priority

Urgent

Recommended defensive actions

• Inventory systems and device fleets to identify where the Arm Mali GPU kernel driver is present.
• Apply vendor updates according to Arm's instructions as soon as they are available and approved for your environment.
• If updates are unavailable for a deployed product, discontinue use of the affected product as CISA advises.
• Prioritize remediation for the most business-critical systems first, while ensuring all confirmed affected assets are covered before the KEV due date.
• Verify remediation by rescanning inventory and confirming the vulnerable driver is no longer present or is fully updated.

Evidence notes

This debrief is grounded in the supplied CISA KEV source item and official records. The source metadata identifies the vulnerability as 'Arm Mali GPU Kernel Driver Use-After-Free Vulnerability,' marks it as a KEV item, and includes the remediation note to apply vendor updates or discontinue use if updates are unavailable. The supplied timeline shows the KEV date added as 2023-07-07 and the due date as 2023-07-28. No CVSS score was provided in the supplied corpus.

Official resources