CVE-2025-38312 (GCVE-0-2025-38312)
Vulnerability from cvelistv5
Published
2025-07-10 07:42
Modified
2025-07-28 04:18
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 96fe6a2109db29cd15b90a093c16e6cb4b19371a
Version: 96fe6a2109db29cd15b90a093c16e6cb4b19371a
Version: 96fe6a2109db29cd15b90a093c16e6cb4b19371a
Version: 96fe6a2109db29cd15b90a093c16e6cb4b19371a
Version: 96fe6a2109db29cd15b90a093c16e6cb4b19371a
Version: 96fe6a2109db29cd15b90a093c16e6cb4b19371a
Version: 96fe6a2109db29cd15b90a093c16e6cb4b19371a
Version: 96fe6a2109db29cd15b90a093c16e6cb4b19371a
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{
  "containers": {
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          "programFiles": [
            "drivers/video/fbdev/core/fbcvt.c"
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:18:17.112Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8"
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        {
          "url": "https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173a"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38312",
    "datePublished": "2025-07-10T07:42:20.647Z",
    "dateReserved": "2025-04-16T04:51:24.003Z",
    "dateUpdated": "2025-07-28T04:18:17.112Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38312\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-10T08:15:30.120\",\"lastModified\":\"2025-07-10T13:17:30.017\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fbdev: core: fbcvt: evitar la divisi\u00f3n por 0 en fb_cvt_hperiod(). En fb_find_mode_cvt(), si mode-\u0026gt;refresh resulta ser 0x80000000, cvt.f_refresh se convertir\u00e1 en 0 al multiplicarlo por 2 debido a un desbordamiento. Luego se pasa a fb_cvt_hperiod(), donde se usa como divisor; la divisi\u00f3n por 0 provocar\u00e1 un error en el kernel. A\u00f1ada una comprobaci\u00f3n de seguridad para cvt.f_refresh para evitar dicho desbordamiento. Encontrado por el Centro de Verificaci\u00f3n de Linux (linuxtesting.org) con la herramienta de an\u00e1lisis est\u00e1tico Svace.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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