# CVE-2024-56737: Memory corruption in GRUB2

> A heap-based buffer overflow in GNU GRUB allows attackers to execute arbitrary code or escalate privileges via a crafted HFS filesystem.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 29 Dec 2024
- **Updated:** 31 Dec 2024
- **Also known as:** AZL-54683, AZL-54712, BELL-CVE-2024-56737, DEBIAN-CVE-2024-56737, GHSA-9vr3-263w-c6mj, UBUNTU-CVE-2024-56737

## What is CVE-2024-56737?

CVE-2024-56737 is a high-severity memory corruption vulnerability in GNU GRUB2, published on 29 Dec 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

GNU GRUB (aka GRUB2) through 2.12 has a heap-based buffer overflow in fs/hfs.c via crafted sblock data in an HFS filesystem.

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2024-56737?

It affects 1 product.


Products: Gnu Grub2.

## How do I fix CVE-2024-56737?

Apply the vendor's patch.

## Is CVE-2024-56737 being exploited?

There is no known exploitation of CVE-2024-56737 in the wild and no public exploit code.

## Other vulnerabilities in GNU GRUB2

- [CVE-2022-28733](https://insights.sbomify.com/CVE-2022-28733/): Integer underflow in grub_net_recv_ip4_packets (high 8.1)
- [CVE-2022-28734](https://insights.sbomify.com/CVE-2022-28734/): Out-of-bounds write when handling split HTTP headers (high 8.1)
- [CVE-2025-61662](https://insights.sbomify.com/CVE-2025-61662/): Grub2: missing unregister call for gettext command may lead to use-after-free (high 7.8)
- [CVE-2024-45782](https://insights.sbomify.com/CVE-2024-45782/): Grub2: fs/hfs: strcpy() using the volume name (fs/hfs.c:382) (high 7.8)
- [CVE-2025-0678](https://insights.sbomify.com/CVE-2025-0678/): Grub2: squash4: integer overflow may lead to heap based out-of-bounds write when reading data (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-56737 and fix it if it is affected.

What it is: CVE-2024-56737 is a high-severity memory corruption vulnerability in GNU GRUB2, published on 29 Dec 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-56737 in the wild and no public exploit code.

Affected product: GNU GRUB2. 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-2024-56737/ (Markdown: https://insights.sbomify.com/CVE-2024-56737/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-56737
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-56737
- OSV: https://osv.dev/vulnerability/CVE-2024-56737

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-56737/
Summaries are generated and may contain mistakes; the official description above is the record.