# CVE-2025-62231: Xorg: xmayland: value overflow in xkbsetcompatmap()

> An attacker can cause memory corruption or a crash in the X.Org X server via crafted input triggering an integer overflow in the Xkb extension.

- **Severity:** High 7.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Oct 2025
- **Updated:** 20 Apr 2026
- **Also known as:** AZL-69467, BELL-CVE-2025-62231, CLSA-2025-1763138343, DEBIAN-CVE-2025-62231, GHSA-h4r4-6hvf-34r8, UBUNTU-CVE-2025-62231

## What is CVE-2025-62231?

CVE-2025-62231 is a high-severity vulnerability in Debian Debian Linux, published on 30 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where improper bounds checking in the XkbSetCompatMap() function can cause an unsigned short overflow. If an attacker sends specially crafted input data, the value calculation may overflow, leading to memory corruption or a crash.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2025-62231?

It affects 11 products.


Products: Debian Debian Linux, Ibm Aix, Ibm Vios, Redhat Enterprise Linux, Redhat Enterprise Linux Aus, Redhat Enterprise Linux Els, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Tus, Redhat Enterprise Linux Update Services for Sap Solutions, X.org X Server, X.org Xwayland.

## How do I fix CVE-2025-62231?

Apply the vendor's patch.

## Is CVE-2025-62231 being exploited?

There is no known exploitation of CVE-2025-62231 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-62231 and fix it if it is affected.

What it is: CVE-2025-62231 is a high-severity vulnerability in Debian Debian Linux, published on 30 Oct 2025. 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-2025-62231 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2025-62231/ (Markdown: https://insights.sbomify.com/CVE-2025-62231/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-62231
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-62231
- OSV: https://osv.dev/vulnerability/CVE-2025-62231

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-62231/
Summaries are generated and may contain mistakes; the official description above is the record.