CVE-2026-74424 (GCVE-0-2026-74424)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-18 06:56
VLAI
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 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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e , < 8e9b8b008f4036df0318870c5d754134ff1b94cc (git)
Affected: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e , < cc4382dc5134826a3936a6b08de17f7dc7abe232 (git)
Affected: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e , < 9b783b7e03dc78ec102edf618259a2b55911fc6a (git)
Affected: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e , < ac970358c5ca0775841bd2a56ce15dc464b99003 (git)
Affected: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e , < 6617df8c246311c82cebf061a4cee55b9df60922 (git)
Affected: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e , < b134ad2f7c06b3c1098dcc95008e2045ff4b49b2 (git)
Affected: d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e , < 5fae9a928482d4845bca169a3a098789203a1ca4 (git)
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Linux Linux Affected: 2.6.23
Unaffected: 0 , < 2.6.23 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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."
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            "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."
          }
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        "id": "CVE-2026-74424",
        "lastModified": "2026-08-18T07:16:54.610",
        "metrics": {},
        "published": "2026-08-15T06:22:44.480",
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      "cve": "CVE-2026-74424",
      "id": "CVE-2026-74424",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fbcon: fix NULL pointer dereference for a console without vc_data",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74424.json",
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      "cve": "CVE-2026-74424",
      "id": "CVE-2026-74424",
      "initial_release_date": "2026-08-25T01:20:50Z",
      "product_status:known_affected": "269",
      "product_status:known_not_affected": "93",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74424",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74424.json",
      "version": "3"
    }
  }
}



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