CVE-2025-38198

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> fbcon: Make sure modelist not set on unregistered console<br /> <br /> It looks like attempting to write to the "store_modes" sysfs node will<br /> run afoul of unregistered consoles:<br /> <br /> UBSAN: array-index-out-of-bounds in drivers/video/fbdev/core/fbcon.c:122:28<br /> index -1 is out of range for type &amp;#39;fb_info *[32]&amp;#39;<br /> ...<br /> fbcon_info_from_console+0x192/0x1a0 drivers/video/fbdev/core/fbcon.c:122<br /> fbcon_new_modelist+0xbf/0x2d0 drivers/video/fbdev/core/fbcon.c:3048<br /> fb_new_modelist+0x328/0x440 drivers/video/fbdev/core/fbmem.c:673<br /> store_modes+0x1c9/0x3e0 drivers/video/fbdev/core/fbsysfs.c:113<br /> dev_attr_store+0x55/0x80 drivers/base/core.c:2439<br /> <br /> static struct fb_info *fbcon_registered_fb[FB_MAX];<br /> ...<br /> static signed char con2fb_map[MAX_NR_CONSOLES];<br /> ...<br /> static struct fb_info *fbcon_info_from_console(int console)<br /> ...<br /> return fbcon_registered_fb[con2fb_map[console]];<br /> <br /> If con2fb_map contains a -1 things go wrong here. Instead, return NULL,<br /> as callers of fbcon_info_from_console() are trying to compare against<br /> existing "info" pointers, so error handling should kick in correctly.