CVE-2026-46191

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6cc50e1c5b57180fd37a31282000f43859b0fe73 < b51c343a81e6e806525a4435e22532c107dd7e9daffected
LinuxLinux6cc50e1c5b57180fd37a31282000f43859b0fe73 < 46cf3646dea54baeaa2eafe3fb1ba769947f31b0affected
LinuxLinux6cc50e1c5b57180fd37a31282000f43859b0fe73 < 524a6079395916fb3d790ef2bb46a1d2939b27ddaffected
LinuxLinux6cc50e1c5b57180fd37a31282000f43859b0fe73 < 594973a2e54924d8ba31c9faac669fc1ba6fcb80affected
LinuxLinux6cc50e1c5b57180fd37a31282000f43859b0fe73 < ab6c34b9829d5de03f1d08a47a2253729a6e7e27affected
LinuxLinux6cc50e1c5b57180fd37a31282000f43859b0fe73 < 7105d9f1387d63b15c9a860674fc92c959181f2faffected
LinuxLinux6cc50e1c5b57180fd37a31282000f43859b0fe73 < b44cc78ff46b96e72d333a3be6aaaa0a14797263affected
LinuxLinux6cc50e1c5b57180fd37a31282000f43859b0fe73 < e4ef723d8975a2694cc90733a6b888a5e2841842affected
LinuxLinux2.6.15affected
LinuxLinux0 < 2.6.15unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.90 <= 6.12.*unaffected
LinuxLinux6.18.32 <= 6.18.*unaffected
LinuxLinux7.0.7 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References