Framebuffer Dereference Vulnerability in Linux Kernel

CVE-2026-53403

What is CVE-2026-53403?

A vulnerability exists in the Linux kernel's framebuffer driver, specifically in the function fb_new_modelist. This flaw arises from the failure to validate the framebuffer's current mode against the new modelist, which can lead to a scenario where the current mode is no longer valid. As a result, subsequent operations that rely on this mode may attempt to dereference a NULL pointer, leading to potential system instability or unexpected behavior. The issue highlights the importance of maintaining consistency when updating mode lists to ensure that current settings are always accounted for.

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