CVE-2026-46191
Published: May 29, 2026Last modified: July 6, 2026
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
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.1 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.177-r0) |
| 25 LTS | linux-lts | Fixed (6.12.92-r0) | |
| Stream | linux-lts | Fixed (6.18.35-r1) |
References
- 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/7105d9f1387d63b15c9a860674fc92c959181f2f
- https://git.kernel.org/stable/c/ab6c34b9829d5de03f1d08a47a2253729a6e7e27
- https://git.kernel.org/stable/c/b44cc78ff46b96e72d333a3be6aaaa0a14797263
- https://git.kernel.org/stable/c/b51c343a81e6e806525a4435e22532c107dd7e9d
- https://git.kernel.org/stable/c/e4ef723d8975a2694cc90733a6b888a5e2841842