---
id: CVE-2026-74424
title: 'fbcon: fix NULL pointer dereference for a console without vc_data'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fbcon: fix NULL pointer dereference for a console without vc_data

  fbcon_new_modelist() runs when a framebuffer's modelist changes. For each
  console mapped to it with f…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e <
    8e9b8b008f4036df0318870c5d754134ff1b94cc
  - >-
    Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e <
    cc4382dc5134826a3936a6b08de17f7dc7abe232
  - >-
    Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e <
    9b783b7e03dc78ec102edf618259a2b55911fc6a
  - >-
    Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e <
    ac970358c5ca0775841bd2a56ce15dc464b99003
  - >-
    Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e <
    6617df8c246311c82cebf061a4cee55b9df60922
  - >-
    Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e <
    b134ad2f7c06b3c1098dcc95008e2045ff4b49b2
  - >-
    Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e <
    5fae9a928482d4845bca169a3a098789203a1ca4
  - Linux 2.6.23
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:57:14.998787Z'
published: '2026-08-15'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:05:45.733Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74424'
references:
  - url: 'https://git.kernel.org/stable/c/8e9b8b008f4036df0318870c5d754134ff1b94cc'
  - url: 'https://git.kernel.org/stable/c/cc4382dc5134826a3936a6b08de17f7dc7abe232'
  - url: 'https://git.kernel.org/stable/c/9b783b7e03dc78ec102edf618259a2b55911fc6a'
  - url: 'https://git.kernel.org/stable/c/ac970358c5ca0775841bd2a56ce15dc464b99003'
  - url: 'https://git.kernel.org/stable/c/6617df8c246311c82cebf061a4cee55b9df60922'
  - url: 'https://git.kernel.org/stable/c/b134ad2f7c06b3c1098dcc95008e2045ff4b49b2'
  - url: 'https://git.kernel.org/stable/c/5fae9a928482d4845bca169a3a098789203a1ca4'
tags:
  - cve.org
epss: 0.00161
epssPercentile: 0.05341
ingestedAt: '2026-11-06T18:00:12.558Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

fbcon: fix NULL pointer dereference for a console without vc_data

fbcon_new_modelist() runs when a framebuffer's modelist changes. For each
console mapped to it with fb_display[i].mode set, it reads vc_cons[i].d and
passes the vc_num to fbcon_set_disp(). This assumes a console with a mode
set has a vc_data, but it can be NULL. fbcon_set_disp() sets
fb_display[i].mode before it checks vc_data, and fbcon_deinit() leaves the
mode set after the vc_data is freed. fbcon_new_modelist() then dereferences
the NULL vc_data.

Keep fb_display[i].mode set only while the console has a vc_data. Check
vc_data before setting the mode in fbcon_set_disp(), and clear the mode in
fbcon_deinit(). The existing mode check in fbcon_new_modelist() then skips
such consoles.

## Affected

- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 8e9b8b008f4036df0318870c5d754134ff1b94cc`
- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < cc4382dc5134826a3936a6b08de17f7dc7abe232`
- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 9b783b7e03dc78ec102edf618259a2b55911fc6a`
- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < ac970358c5ca0775841bd2a56ce15dc464b99003`
- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 6617df8c246311c82cebf061a4cee55b9df60922`
- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < b134ad2f7c06b3c1098dcc95008e2045ff4b49b2`
- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 5fae9a928482d4845bca169a3a098789203a1ca4`
- `Linux 2.6.23`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.