# CVE-2024-46852: dma-buf: heaps: Fix off-by-one in CMA heap fault handler


- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 27 Sep 2024
- **Updated:** 5 Aug 2026
- **Also known as:** A-363259128, ASB-A-363259128, AZL-49809, AZL-49837, BELL-CVE-2024-46852, DEBIAN-CVE-2024-46852, GHSA-5793-wfxr-j725, UBUNTU-CVE-2024-46852

## What is CVE-2024-46852?

CVE-2024-46852 is a high-severity vulnerability in Debian Debian Linux, published on 27 Sep 2024. 

### Official description

In the Linux kernel, the following vulnerability has been resolved:

dma-buf: heaps: Fix off-by-one in CMA heap fault handler

Until VM_DONTEXPAND was added in commit 1c1914d6e8c6 ("dma-buf: heaps:
Don't track CMA dma-buf pages under RssFile") it was possible to obtain
a mapping larger than the buffer size via mremap and bypass the overflow
check in dma_buf_mmap_internal. When using such a mapping to attempt to
fault past the end of the buffer, the CMA heap fault handler also checks
the fault offset against the buffer size, but gets the boundary wrong by
1. Fix the boundary check so that we don't read off the end of the pages
array and insert an arbitrary page in the mapping.

Weakness: CWE-193 (Off-by-one Error)

## Which versions are affected by CVE-2024-46852?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2024-46852?

Upgrade to a fixed version.

## Is CVE-2024-46852 being exploited?

There is no known exploitation of CVE-2024-46852 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

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- [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-2024-46852 and fix it if it is affected.

What it is: CVE-2024-46852 is a high-severity vulnerability in Debian Debian Linux, published on 27 Sep 2024. 
Exploitation: There is no known exploitation of CVE-2024-46852 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-2024-46852/ (Markdown: https://insights.sbomify.com/CVE-2024-46852/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-46852
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-46852
- OSV: https://osv.dev/vulnerability/CVE-2024-46852

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-46852/
Summaries are generated and may contain mistakes; the official description above is the record.