1.6 KiB
CVE-2025-38198
Description
In the Linux kernel, the following vulnerability has been resolved:fbcon: Make sure modelist not set on unregistered consoleIt looks like attempting to write to the "store_modes" sysfs node willrun afoul of unregistered consoles:UBSAN: array-index-out-of-bounds in drivers/video/fbdev/core/fbcon.c:122:28index -1 is out of range for type 'fb_info *[32]'... fbcon_info_from_console+0x192/0x1a0 drivers/video/fbdev/core/fbcon.c:122 fbcon_new_modelist+0xbf/0x2d0 drivers/video/fbdev/core/fbcon.c:3048 fb_new_modelist+0x328/0x440 drivers/video/fbdev/core/fbmem.c:673 store_modes+0x1c9/0x3e0 drivers/video/fbdev/core/fbsysfs.c:113 dev_attr_store+0x55/0x80 drivers/base/core.c:2439static struct fb_info *fbcon_registered_fb[FB_MAX];...static signed char con2fb_map[MAX_NR_CONSOLES];...static struct fb_info *fbcon_info_from_console(int console)... return fbcon_registered_fb[con2fb_map[console]];If con2fb_map contains a -1 things go wrong here. Instead, return NULL,as callers of fbcon_info_from_console() are trying to compare againstexisting "info" pointers, so error handling should kick in correctly.
POC
Reference
No PoCs from references.