ghsa-2v92-8hh5-248m
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
fbcon: Make sure modelist not set on unregistered console
It looks like attempting to write to the "store_modes" sysfs node will run afoul of unregistered consoles:
UBSAN: array-index-out-of-bounds in drivers/video/fbdev/core/fbcon.c:122:28 index -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:2439
static 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 against existing "info" pointers, so error handling should kick in correctly.
{
"affected": [],
"aliases": [
"CVE-2025-38198"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-07-04T14:15:27Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbcon: Make sure modelist not set on unregistered console\n\nIt looks like attempting to write to the \"store_modes\" sysfs node will\nrun afoul of unregistered consoles:\n\nUBSAN: array-index-out-of-bounds in drivers/video/fbdev/core/fbcon.c:122:28\nindex -1 is out of range for type \u0027fb_info *[32]\u0027\n...\n fbcon_info_from_console+0x192/0x1a0 drivers/video/fbdev/core/fbcon.c:122\n fbcon_new_modelist+0xbf/0x2d0 drivers/video/fbdev/core/fbcon.c:3048\n fb_new_modelist+0x328/0x440 drivers/video/fbdev/core/fbmem.c:673\n store_modes+0x1c9/0x3e0 drivers/video/fbdev/core/fbsysfs.c:113\n dev_attr_store+0x55/0x80 drivers/base/core.c:2439\n\nstatic struct fb_info *fbcon_registered_fb[FB_MAX];\n...\nstatic signed char con2fb_map[MAX_NR_CONSOLES];\n...\nstatic struct fb_info *fbcon_info_from_console(int console)\n...\n return fbcon_registered_fb[con2fb_map[console]];\n\nIf con2fb_map contains a -1 things go wrong here. Instead, return NULL,\nas callers of fbcon_info_from_console() are trying to compare against\nexisting \"info\" pointers, so error handling should kick in correctly.",
"id": "GHSA-2v92-8hh5-248m",
"modified": "2025-07-04T15:31:09Z",
"published": "2025-07-04T15:31:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38198"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/519ba75728ee8cd561dce25fc52a2ec5c47171dc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/54b28f7c567dd659e5f9562f518e4d7f3f6a367b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b3237d451bf3a4490cb1a76f3b7c91d9888f1c4b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cedc1b63394a866bf8663a3e40f4546f1d28c8d8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f28f1f578cd810779d01999c60618cda14c281dd"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
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