FKIE_CVE-2026-74424

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-18 07:16
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5fae9a928482d4845bca169a3a098789203a1ca4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6617df8c246311c82cebf061a4cee55b9df60922
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8e9b8b008f4036df0318870c5d754134ff1b94cc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b783b7e03dc78ec102edf618259a2b55911fc6a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ac970358c5ca0775841bd2a56ce15dc464b99003
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b134ad2f7c06b3c1098dcc95008e2045ff4b49b2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cc4382dc5134826a3936a6b08de17f7dc7abe232
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fbcon.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8e9b8b008f4036df0318870c5d754134ff1b94cc",
              "status": "affected",
              "version": "d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e",
              "versionType": "git"
            },
            {
              "lessThan": "cc4382dc5134826a3936a6b08de17f7dc7abe232",
              "status": "affected",
              "version": "d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e",
              "versionType": "git"
            },
            {
              "lessThan": "9b783b7e03dc78ec102edf618259a2b55911fc6a",
              "status": "affected",
              "version": "d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e",
              "versionType": "git"
            },
            {
              "lessThan": "ac970358c5ca0775841bd2a56ce15dc464b99003",
              "status": "affected",
              "version": "d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e",
              "versionType": "git"
            },
            {
              "lessThan": "6617df8c246311c82cebf061a4cee55b9df60922",
              "status": "affected",
              "version": "d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e",
              "versionType": "git"
            },
            {
              "lessThan": "b134ad2f7c06b3c1098dcc95008e2045ff4b49b2",
              "status": "affected",
              "version": "d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e",
              "versionType": "git"
            },
            {
              "lessThan": "5fae9a928482d4845bca169a3a098789203a1ca4",
              "status": "affected",
              "version": "d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fbcon.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.23"
            },
            {
              "lessThan": "2.6.23",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-74424",
  "lastModified": "2026-08-18T07:16:54.610",
  "metrics": {},
  "published": "2026-08-15T06:22:44.480",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5fae9a928482d4845bca169a3a098789203a1ca4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6617df8c246311c82cebf061a4cee55b9df60922"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8e9b8b008f4036df0318870c5d754134ff1b94cc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9b783b7e03dc78ec102edf618259a2b55911fc6a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ac970358c5ca0775841bd2a56ce15dc464b99003"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b134ad2f7c06b3c1098dcc95008e2045ff4b49b2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cc4382dc5134826a3936a6b08de17f7dc7abe232"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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