CVE-2025-40304

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the Linux kernel's fbdev component related to insufficient bounds checking within the bit putcs function. This can lead to out-of-bounds writes when rendering text near the edges of the screen, specifically when using vmalloc. The issue arises from mismatched parameters passed to bit putcs aligned and bit putcs unaligned due to an incorrect character count update during image clipping. This allows writes beyond the allocated framebuffer boundaries.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.