ghsa-qjhc-7f62-c8xv
Vulnerability from github
Published
2025-07-10 09:32
Modified
2025-11-03 18:31
Details

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

fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()

In fb_find_mode_cvt(), iff mode->refresh somehow happens to be 0x80000000, cvt.f_refresh will become 0 when multiplying it by 2 due to overflow. It's then passed to fb_cvt_hperiod(), where it's used as a divider -- division by 0 will result in kernel oops. Add a sanity check for cvt.f_refresh to avoid such overflow...

Found by Linux Verification Center (linuxtesting.org) with the Svace static analysis tool.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38312"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-10T08:15:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()\n\nIn fb_find_mode_cvt(), iff mode-\u003erefresh somehow happens to be 0x80000000,\ncvt.f_refresh will become 0 when multiplying it by 2 due to overflow. It\u0027s\nthen passed to fb_cvt_hperiod(), where it\u0027s used as a divider -- division\nby 0 will result in kernel oops. Add a sanity check for cvt.f_refresh to\navoid such overflow...\n\nFound by Linux Verification Center (linuxtesting.org) with the Svace static\nanalysis tool.",
  "id": "GHSA-qjhc-7f62-c8xv",
  "modified": "2025-11-03T18:31:24Z",
  "published": "2025-07-10T09:32:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38312"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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