Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds Add bounds checking to prevent writes past framebuffer boundaries when rendering text near screen edges. Return early if the Y position is off-screen and clip image height to screen boundary. Break from the rendering loop if the X position is off-screen. When clipping image width to fit the screen, update the character count to match the clipped width to prevent buffer size mismatches. Without the character count update, bit_putcs_aligned and bit_putcs_unaligned receive mismatched parameters where the buffer is allocated for the clipped width but cnt reflects the original larger count, causing out-of-bounds writes.

Severity Unknown

CVSS Score N/A

CVSS Vector N/A

CWE N/A

Public Exploit ✅ No

Source NVD

Published 2025-12-08

Updated 2026-06-02

Modified 2026-04-16

Fix URL N/A

Software	From version	Fixed in
kernel	6.13.0	6.17.8
unknown	—	—