Freed-memory access via valid GPU operations
Published Sep 8, 2026 · Updated Sep 8, 2026
Use after free in Arm Valhall and 5th Gen GPU Architecture Userspace Drivers through r55p0 allows local users to access freed memory. Arm has not disclosed the responsible function or the operation that uses memory after its lifetime ends during otherwise valid GPU processing. A non-privileged process needs GPU access, including through WebGL or WebGPU; published evidence establishes freed-memory access but no further consequence.
Summary
What happened
Use after free in Arm Valhall and 5th Gen GPU Architecture Userspace Drivers through r55p0 allows local users to access freed memory. Arm has not disclosed the responsible function or the operation that uses memory after its lifetime ends during otherwise valid GPU processing. A non-privileged process needs GPU access, including through WebGL or WebGPU; published evidence establishes freed-memory access but no further consequence.
The record
- CVE
- CVE-2026-11891
- Published
- Sep 8, 2026
- Updated
- Sep 8, 2026
- Vendor
- Arm
- Product
- Arm 5th Gen GPU Architecture Userspace Driver
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=r46p0 <=r49p5
- Affected versionversion=r50p0 <=r54p3
- Affected versionversion=r55p0
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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