# CVE-2024-31080: Xorg-x11-server: heap buffer overread/data leakage in procxigetselectedevents

> An attacker can trigger a heap buffer over-read in the X.org server to leak memory contents and cause a crash via crafted client requests.

- **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:** 4 Apr 2024
- **Updated:** 20 Nov 2025
- **Also known as:** AZL-39349, AZL-45300, BELL-CVE-2024-31080, DEBIAN-CVE-2024-31080, GHSA-mqqf-4p7r-rf89, UBUNTU-CVE-2024-31080

## What is CVE-2024-31080?

CVE-2024-31080 is a high-severity vulnerability in Red Hat Enterprise Linux 10, published on 4 Apr 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A heap-based buffer over-read vulnerability was found in the X.org server's ProcXIGetSelectedEvents() function. This issue occurs when byte-swapped length values are used in replies, potentially leading to memory leakage and segmentation faults, particularly when triggered by a client with a different endianness. This vulnerability could be exploited by an attacker to cause the X server to read heap memory values and then transmit them back to the client until encountering an unmapped page, resulting in a crash. Despite the attacker's inability to control the specific memory copied into the replies, the small length values typically stored in a 32-bit integer can result in significant attempted out-of-bounds reads.

Weakness: CWE-126 (Buffer Over-read)

## Which versions are affected by CVE-2024-31080?


## How do I fix CVE-2024-31080?

Apply the vendor's patch.

## Is CVE-2024-31080 being exploited?

There is no known exploitation of CVE-2024-31080 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-31080 and fix it if it is affected.

What it is: CVE-2024-31080 is a high-severity vulnerability in Red Hat Enterprise Linux 10, published on 4 Apr 2024. 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-2024-31080 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. 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-2024-31080/ (Markdown: https://insights.sbomify.com/CVE-2024-31080/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-31080
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-31080
- OSV: https://osv.dev/vulnerability/CVE-2024-31080

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-31080/
Summaries are generated and may contain mistakes; the official description above is the record.