Linux Kernel fbcon OOB font access via console rotation
CVE-2026-46191 Published on May 28, 2026
fbcon: Avoid OOB font access if console rotation fails
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
Products Associated with CVE-2026-46191
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Affected Versions
Linux:- Version 6cc50e1c5b57180fd37a31282000f43859b0fe73 and below 594973a2e54924d8ba31c9faac669fc1ba6fcb80 is affected.
- Version 6cc50e1c5b57180fd37a31282000f43859b0fe73 and below ab6c34b9829d5de03f1d08a47a2253729a6e7e27 is affected.
- Version 6cc50e1c5b57180fd37a31282000f43859b0fe73 and below 7105d9f1387d63b15c9a860674fc92c959181f2f is affected.
- Version 6cc50e1c5b57180fd37a31282000f43859b0fe73 and below b44cc78ff46b96e72d333a3be6aaaa0a14797263 is affected.
- Version 6cc50e1c5b57180fd37a31282000f43859b0fe73 and below e4ef723d8975a2694cc90733a6b888a5e2841842 is affected.
- Version 2.6.15 is affected.
- Before 2.6.15 is unaffected.
- Version 6.6.140, <= 6.6.* is unaffected.
- Version 6.12.90, <= 6.12.* is unaffected.
- Version 6.18.32, <= 6.18.* is unaffected.
- Version 7.0.7, <= 7.0.* is unaffected.
- Version 7.1-rc1, <= * is unaffected.