CVE-2026-53403 (GCVE-0-2026-53403)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 06:41
VLAI
Title
fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var info->var, a framebuffer's current mode, is expected to have a matching entry in info->modelist. var_to_display() relies on this and treats a failed fb_match_mode() as "This should not happen". fb_set_var() keeps it true by adding the mode to the list on every change, and do_register_framebuffer() does the same at registration. store_modes() replaces the modelist from userspace. fb_new_modelist() validates the new modes but does not check that info->var still has a match. It relies on fbcon_new_modelist() to re-point consoles, but that only handles consoles mapped to the framebuffer. With fbcon unbound there are none, so info->var is left describing a mode that is no longer in the list. A later console takeover runs var_to_display(), where fb_match_mode() returns NULL and leaves fb_display[i].mode NULL. fbcon_switch() passes it to display_to_var(), and fb_videomode_to_var() dereferences the NULL mode. Keep the current mode in the list in fb_new_modelist(), the same way fb_set_var() does.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1458a4d804550b7101e8bb02c1cb941088e4c0c7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8707f02ac9f5f632039b60df2c9f3dc914709f72 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0d8c7f21ad8529d5c181e61f86be35b887ae2e4d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7640b4f68acb54c2c4f6b4a8aee0e9849dacd929 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < eea16b6f805c0b1fb2f72f0f771088ea45356956 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 88913059c77e171f44ba829282d42dde0d458811 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7f08fc10fa3d3366dc3af723970bd03d7d6d10e3 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var\n\ninfo-\u003evar, a framebuffer\u0027s current mode, is expected to have a matching\nentry in info-\u003emodelist. var_to_display() relies on this and treats a\nfailed fb_match_mode() as \"This should not happen\". fb_set_var() keeps it\ntrue by adding the mode to the list on every change, and\ndo_register_framebuffer() does the same at registration.\n\nstore_modes() replaces the modelist from userspace. fb_new_modelist()\nvalidates the new modes but does not check that info-\u003evar still has a\nmatch. It relies on fbcon_new_modelist() to re-point consoles, but that\nonly handles consoles mapped to the framebuffer. With fbcon unbound there\nare none, so info-\u003evar is left describing a mode that is no longer in the\nlist.\n\nA later console takeover runs var_to_display(), where fb_match_mode()\nreturns NULL and leaves fb_display[i].mode NULL. fbcon_switch() passes it\nto display_to_var(), and fb_videomode_to_var() dereferences the NULL mode.\n\nKeep the current mode in the list in fb_new_modelist(), the same way\nfb_set_var() does."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T06:41:25.020Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1458a4d804550b7101e8bb02c1cb941088e4c0c7"
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          "url": "https://git.kernel.org/stable/c/8707f02ac9f5f632039b60df2c9f3dc914709f72"
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          "url": "https://git.kernel.org/stable/c/0d8c7f21ad8529d5c181e61f86be35b887ae2e4d"
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          "url": "https://git.kernel.org/stable/c/7640b4f68acb54c2c4f6b4a8aee0e9849dacd929"
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          "url": "https://git.kernel.org/stable/c/88913059c77e171f44ba829282d42dde0d458811"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f08fc10fa3d3366dc3af723970bd03d7d6d10e3"
        }
      ],
      "title": "fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53403",
    "datePublished": "2026-07-19T12:02:02.382Z",
    "dateReserved": "2026-06-09T07:44:35.403Z",
    "dateUpdated": "2026-07-20T06:41:25.020Z",
    "state": "PUBLISHED"
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53403.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53403\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:51.510\",\"lastModified\":\"2026-07-20T07:16:38.150\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var\\n\\ninfo-\u003evar, a framebuffer\u0027s current mode, is expected to have a matching\\nentry in info-\u003emodelist. var_to_display() relies on this and treats a\\nfailed fb_match_mode() as \\\"This should not happen\\\". fb_set_var() keeps it\\ntrue by adding the mode to the list on every change, and\\ndo_register_framebuffer() does the same at registration.\\n\\nstore_modes() replaces the modelist from userspace. fb_new_modelist()\\nvalidates the new modes but does not check that info-\u003evar still has a\\nmatch. It relies on fbcon_new_modelist() to re-point consoles, but that\\nonly handles consoles mapped to the framebuffer. With fbcon unbound there\\nare none, so info-\u003evar is left describing a mode that is no longer in the\\nlist.\\n\\nA later console takeover runs var_to_display(), where fb_match_mode()\\nreturns NULL and leaves fb_display[i].mode NULL. fbcon_switch() passes it\\nto display_to_var(), and fb_videomode_to_var() dereferences the NULL mode.\\n\\nKeep the current mode in the list in fb_new_modelist(), the same way\\nfb_set_var() does.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/video/fbdev/core/fbmem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"1458a4d804550b7101e8bb02c1cb941088e4c0c7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"8707f02ac9f5f632039b60df2c9f3dc914709f72\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"0d8c7f21ad8529d5c181e61f86be35b887ae2e4d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"7640b4f68acb54c2c4f6b4a8aee0e9849dacd929\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"eea16b6f805c0b1fb2f72f0f771088ea45356956\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"88913059c77e171f44ba829282d42dde0d458811\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"7f08fc10fa3d3366dc3af723970bd03d7d6d10e3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/video/fbdev/core/fbmem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0d8c7f21ad8529d5c181e61f86be35b887ae2e4d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1458a4d804550b7101e8bb02c1cb941088e4c0c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7640b4f68acb54c2c4f6b4a8aee0e9849dacd929\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7f08fc10fa3d3366dc3af723970bd03d7d6d10e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8707f02ac9f5f632039b60df2c9f3dc914709f72\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/88913059c77e171f44ba829282d42dde0d458811\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eea16b6f805c0b1fb2f72f0f771088ea45356956\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T08:03:36+00:00",
      "cve": "CVE-2026-53403",
      "id": "CVE-2026-53403",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53403.json",
      "version": "3"
    }
  }
}



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