fkie_cve-2025-38312
Vulnerability from fkie_nvd
Published
2025-07-10 08:15
Modified
2025-11-03 18:16
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Impacted products
Vendor Product Version


To clipboard 

{
  "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."
    }
  ],
  "id": "CVE-2025-38312",
  "lastModified": "2025-11-03T18:16:13.110",
  "metrics": {},
  "published": "2025-07-10T08:15:30.120",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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