fbcon: Avoid OOB font access if console rotation fails

Summary

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

Timeline

1. May 28, 2026, 9:36 AM UTCCVE published
2. Oct 15, 2026, 1:21 AM UTCRecord last updated

Affected versions

• Linux 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 Linux

  2.6.15

• KernelLinux

  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

References 8