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GHSA-WQ9G-885W-MM9H

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74424"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:44Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbcon: fix NULL pointer dereference for a console without vc_data\n\nfbcon_new_modelist() runs when a framebuffer\u0027s modelist changes. For each\nconsole mapped to it with fb_display[i].mode set, it reads vc_cons[i].d and\npasses the vc_num to fbcon_set_disp(). This assumes a console with a mode\nset has a vc_data, but it can be NULL. fbcon_set_disp() sets\nfb_display[i].mode before it checks vc_data, and fbcon_deinit() leaves the\nmode set after the vc_data is freed. fbcon_new_modelist() then dereferences\nthe NULL vc_data.\n\nKeep fb_display[i].mode set only while the console has a vc_data. Check\nvc_data before setting the mode in fbcon_set_disp(), and clear the mode in\nfbcon_deinit(). The existing mode check in fbcon_new_modelist() then skips\nsuch consoles.",
  "id": "GHSA-wq9g-885w-mm9h",
  "modified": "2026-08-15T06:32:33Z",
  "published": "2026-08-15T06:32:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74424"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5fae9a928482d4845bca169a3a098789203a1ca4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6617df8c246311c82cebf061a4cee55b9df60922"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e9b8b008f4036df0318870c5d754134ff1b94cc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b783b7e03dc78ec102edf618259a2b55911fc6a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac970358c5ca0775841bd2a56ce15dc464b99003"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b134ad2f7c06b3c1098dcc95008e2045ff4b49b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc4382dc5134826a3936a6b08de17f7dc7abe232"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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