CVE-2026-7477

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Use After Free in Arm GPU Kernel Drivers

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Arm Limited

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 r44p0 through r49p4, from r50p0 through r51p0, from r54p1 through r54p2; Valhall GPU Kernel Driver: from r44p0 through r49p5, from r50p0 through r54p3; Arm 5th Gen GPU Architecture Kernel Driver: from r44p0 through r49p5, from r50p0 through r54p3, r55p0.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-09

AI Q&A

2026-09-09

EPSS Evaluated

N/A

NVD

CVE-2026-7477

Affected Vendors & Products

Vendor	Product	Version / Range
arm_ltd	bifrost_gpu_kernel_driver	From r44p0 (inc) to r49p4 (inc)
arm_ltd	bifrost_gpu_kernel_driver	From r50p0 (inc) to r51p0 (inc)
arm_ltd	bifrost_gpu_kernel_driver	From r54p1 (inc) to r54p2 (inc)
arm_ltd	valhall_gpu_kernel_driver	From r44p0 (inc) to r49p5 (inc)
arm_ltd	valhall_gpu_kernel_driver	From r50p0 (inc) to r54p3 (inc)
arm_ltd	arm_5th_gen_gpu_architecture_kernel_driver	From r44p0 (inc) to r49p5 (inc)
arm_ltd	arm_5th_gen_gpu_architecture_kernel_driver	From r50p0 (inc) to r54p3 (inc)
arm_ltd	arm_5th_gen_gpu_architecture_kernel_driver	From 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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's GPU kernel drivers. It allows a local non-privileged user process to access memory that has already been freed during GPU memory processing operations.

Detection Guidance

Detection requires checking the version of the affected GPU kernel drivers. Commands like 'modinfo bifrost' or 'modinfo valhall' can show driver versions. Compare installed versions against the affected ranges: Bifrost (r44p0-r49p4, r50p0-r51p0, r54p1-r54p2), Valhall (r44p0-r49p5, r50p0-r54p3), or Arm 5th Gen (r44p0-r49p5, r50p0-r54p3, r55p0).

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Impact Analysis

A successful exploit could lead to system crashes, data corruption, or potentially allow privilege escalation. Since it requires local access, remote exploitation is less likely.

Mitigation Strategies

Update GPU kernel drivers to versions outside the affected ranges. For Bifrost, upgrade to r52p0 or later. For Valhall and Arm 5th Gen, upgrade to r55p1 or later. Contact Arm support or your device vendor for patches.

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