CVE-2026-74424 (GCVE-0-2026-74424)
Vulnerability from cvelistv5
Published
2026-08-15 05:59
Modified
2026-08-18 06:56
Severity ?
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 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e
Version: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e
Version: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e
Version: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e
Version: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e
Version: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e
Version: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fbcon.c"
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          "vendor": "Linux",
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              "version": "0",
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              "version": "7.1.5",
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T06:56:33.340Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "fbcon: fix NULL pointer dereference for a console without vc_data",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74424",
    "datePublished": "2026-08-15T05:59:27.179Z",
    "dateReserved": "2026-08-15T05:44:03.894Z",
    "dateUpdated": "2026-08-18T06:56:33.340Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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