# CVE-2022-3775: Memory corruption in grub2

> An attacker can trigger out-of-bounds writes in GRUB2 via crafted Unicode sequences, causing memory corruption, denial of service, or potential code execution.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/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:** 19 Dec 2022
- **Updated:** 27 May 2026
- **Also known as:** AZL-12079, AZL-34792, DEBIAN-CVE-2022-3775, GHSA-8h84-vmjf-pcmj, UBUNTU-CVE-2022-3775

## What is CVE-2022-3775?

CVE-2022-3775 is a high-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 19 Dec 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2022-3775?

It affects 2 products.


Products: Gnu Grub2, Redhat Enterprise Linux.

## How do I fix CVE-2022-3775?

Apply the vendor's patch.

## Is CVE-2022-3775 being exploited?

There is no known exploitation of CVE-2022-3775 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2024-56737](https://insights.sbomify.com/CVE-2024-56737/): Memory corruption in GRUB2 (high 8.8)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-3775 and fix it if it is affected.

What it is: CVE-2022-3775 is a high-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 19 Dec 2022. 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-2022-3775 in the wild and no public exploit code.

Affected product: Redhat Enterprise 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-2022-3775/ (Markdown: https://insights.sbomify.com/CVE-2022-3775/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-3775
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-3775
- OSV: https://osv.dev/vulnerability/CVE-2022-3775

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-3775/
Summaries are generated and may contain mistakes; the official description above is the record.