CVE-2026-11891

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Use After Free in Arm Valhall GPU Driver

Publication date: 2026-09-08

Last updated on: 2026-09-10

Assigner: Arm Limited

Description

Use After Free vulnerability in Arm Ltd Valhall GPU Userspace Driver, Arm Ltd Arm 5th Gen GPU Architecture Userspace Driver allows a non-privileged user process to perform valid GPU processing operations, including via WebGL or WebGPU, to access already freed memory. This issue affects Valhall GPU Userspace Driver: from r46p0 through r49p5, from r50p0 through r54p3, r55p0; Arm 5th Gen GPU Architecture Userspace Driver: from r46p0 through r49p5, from r50p0 through r54p3, r55p0.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-10

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-11891

Affected Vendors & Products

Vendor	Product	Version / Range
arm_ltd	valhall_gpu_userspace_driver	From r46p0 (inc) to r49p5 (inc)
arm_ltd	valhall_gpu_userspace_driver	From r50p0 (inc) to r54p3 (inc)
arm_ltd	valhall_gpu_userspace_driver	to r55p0 (inc)
arm_ltd	arm_5th_gen_gpu_architecture_userspace_driver	From r46p0 (inc) to r49p5 (inc)
arm_ltd	arm_5th_gen_gpu_architecture_userspace_driver	From r50p0 (inc) to r54p3 (inc)
arm_ltd	arm_5th_gen_gpu_architecture_userspace_driver	to r55p0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This is a Use After Free vulnerability in Arm Ltd's Valhall GPU Userspace Driver and Arm 5th Gen GPU Architecture Userspace Driver. It allows a non-privileged user process to access memory that has already been freed during valid GPU processing operations, including through WebGL or WebGPU.

Detection Guidance

Detection requires checking the version of the Valhall GPU Userspace Driver or Arm 5th Gen GPU Architecture Userspace Driver. Affected versions are r46p0 through r49p5, r50p0 through r54p3, and r55p0.

Impact Analysis

This vulnerability could allow an attacker to read sensitive data from freed memory, cause system crashes, or potentially execute arbitrary code on affected systems using the vulnerable GPU drivers.

Mitigation Strategies

Update the GPU drivers to versions outside the affected range. For Valhall GPU Userspace Driver, upgrade to versions after r55p0 or r54p4. For Arm 5th Gen GPU Architecture Userspace Driver, upgrade to versions after r55p0 or r54p4.

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