Bug 2482635 (CVE-2026-46191) - CVE-2026-46191 kernel: fbcon: Avoid OOB font access if console rotation fails
Summary: CVE-2026-46191 kernel: fbcon: Avoid OOB font access if console rotation fails
Keywords:
Status: NEW
Alias: CVE-2026-46191
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-28 11:06 UTC by OSIDB Bzimport
Modified: 2026-05-28 14:05 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:


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Description OSIDB Bzimport 2026-05-28 11:06:56 UTC
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


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