GHSA-HCC6-6437-VWM2

Vulnerability from github – Published: 2025-12-08 03:31 – Updated: 2025-12-08 03:31
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

fbdev: bitblit: bound-check glyph index in bit_putcs*

bit_putcs_aligned()/unaligned() derived the glyph pointer from the character value masked by 0xff/0x1ff, which may exceed the actual font's glyph count and read past the end of the built-in font array. Clamp the index to the actual glyph count before computing the address.

This fixes a global out-of-bounds read reported by syzbot.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40322"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-08T01:16:04Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: bitblit: bound-check glyph index in bit_putcs*\n\nbit_putcs_aligned()/unaligned() derived the glyph pointer from the\ncharacter value masked by 0xff/0x1ff, which may exceed the actual font\u0027s\nglyph count and read past the end of the built-in font array.\nClamp the index to the actual glyph count before computing the address.\n\nThis fixes a global out-of-bounds read reported by syzbot.",
  "id": "GHSA-hcc6-6437-vwm2",
  "modified": "2025-12-08T03:31:02Z",
  "published": "2025-12-08T03:31:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40322"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0998a6cb232674408a03e8561dc15aa266b2f53b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/901f44227072be60812fe8083e83e1533c04eed1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ba1a7802ca9a2590cef95b253e6526f4364477f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a10cede006f9614b465cf25609a8753efbfd45cc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c12003bf91fdff381c55ef54fef3e961a5af2545"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db5c9a162d2f42bcc842b76b3d935dcc050a0eec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/efaf89a75a29b2d179bf4fe63ca62852e93ad620"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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