# CVE-2026-11891: Mali GPU Userspace Driver allows access to already freed memory

> A use-after-free flaw in Arm Mali GPU drivers allows non-privileged users to access freed memory via WebGL or WebGPU, potentially leading to information disclosure or code execution.

- **Severity:** Medium 5.1 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-v44f-6g2r-3454

## What is CVE-2026-11891?

CVE-2026-11891 is a medium-severity use after free vulnerability in Arm 5th Gen GPU Architecture Userspace Driver, published on 8 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2026-11891?


## How do I fix CVE-2026-11891?

No fix has been published for CVE-2026-11891 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11891 being exploited?

There is no known exploitation of CVE-2026-11891 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11891 and fix it if it is affected.

What it is: CVE-2026-11891 is a medium-severity use after free vulnerability in Arm 5th Gen GPU Architecture Userspace Driver, published on 8 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-11891 in the wild and no public exploit code.

Affected product: Arm 5th Gen GPU Architecture Userspace Driver. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-11891/ (Markdown: https://insights.sbomify.com/CVE-2026-11891/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11891
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11891
- OSV: https://osv.dev/vulnerability/CVE-2026-11891

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-11891/
Summaries are generated and may contain mistakes; the official description above is the record.