In the Linux kernel, the following vulnerability has been resolved: fbdev: serialize mode sysfs acc...

linux Updated 05 Sep 2026

Summary

04/09/2026

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

DEBIAN-CVE-2026-80785: In the Linux kernel, the following vulnerability has been resolved: fbdev: serialize mode sysfs access with lock_fb_info() show_mode(), show_modes(), and store_mode() access fb_info->modelist and fb_info->mode without ho... Affects linux versions 6.1.106-1 – 7.2~rc7-1~exp1. No fix is published. How to fix ↓

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In the Linux kernel, the following vulnerability has been resolved: fbdev: serialize mode sysfs access with lock_fb_info() show_mode(), show_modes(), and store_mode() access fb_info->modelist and fb_info->mode without holding lock_fb_info(). store_modes() takes lock_fb_info() while replacing the modelist and freeing the old one. A concurrent reader or writer can load a pointer to an old modelist entry before store_modes() frees it, then dereference freed memory or store a stale freed pointer in fb_info->mode. Take lock_fb_info() in show_mode(), show_modes(), and store_mode() to serialize with store_modes(). In show_mode(), copy the mode to the stack and format after dropping the lock. In store_mode(), split activate() into a _locked variant to avoid double-locking, and hold the locks for the modelist walk, mode conversion, activation, and fb_info->mode assignment together.