{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "1458a4d804550b7101e8bb02c1cb941088e4c0c7"
            },
            {
              "fixed": "8707f02ac9f5f632039b60df2c9f3dc914709f72"
            },
            {
              "fixed": "0d8c7f21ad8529d5c181e61f86be35b887ae2e4d"
            },
            {
              "fixed": "7640b4f68acb54c2c4f6b4a8aee0e9849dacd929"
            },
            {
              "fixed": "4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e"
            },
            {
              "fixed": "eea16b6f805c0b1fb2f72f0f771088ea45356956"
            },
            {
              "fixed": "88913059c77e171f44ba829282d42dde0d458811"
            },
            {
              "fixed": "7f08fc10fa3d3366dc3af723970bd03d7d6d10e3"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "5.10.260"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.211"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.177"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.144"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.38"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53403.json"
  },
  "details": "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's 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.",
  "id": "CVE-2026-53403",
  "modified": "2026-08-18T03:31:28.341500690Z",
  "published": "2026-07-19T12:02:02.382Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d8c7f21ad8529d5c181e61f86be35b887ae2e4d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1458a4d804550b7101e8bb02c1cb941088e4c0c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7640b4f68acb54c2c4f6b4a8aee0e9849dacd929"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f08fc10fa3d3366dc3af723970bd03d7d6d10e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8707f02ac9f5f632039b60df2c9f3dc914709f72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88913059c77e171f44ba829282d42dde0d458811"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eea16b6f805c0b1fb2f72f0f771088ea45356956"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53403.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53403"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var"
}