CVE-2022-50102 (GCVE-0-2022-50102)
Vulnerability from cvelistv5
Published
2025-06-18 11:02
Modified
2025-06-18 11:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock() Since the user can control the arguments of the ioctl() from the user space, under special arguments that may result in a divide-by-zero bug in: drivers/video/fbdev/arkfb.c:784: ark_set_pixclock(info, (hdiv * info->var.pixclock) / hmul); with hdiv=1, pixclock=1 and hmul=2 you end up with (1*1)/2 = (int) 0. and then in: drivers/video/fbdev/arkfb.c:504: rv = dac_set_freq(par->dac, 0, 1000000000 / pixclock); we'll get a division-by-zero. The following log can reveal it: divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:ark_set_pixclock drivers/video/fbdev/arkfb.c:504 [inline] RIP: 0010:arkfb_set_par+0x10fc/0x24c0 drivers/video/fbdev/arkfb.c:784 Call Trace: fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189 Fix this by checking the argument of ark_set_pixclock() first.
References
Impacted products
Vendor Product Version
Linux Linux Version: 681e14730c73cc2c71af282c001de6bc71c22f00
Version: 681e14730c73cc2c71af282c001de6bc71c22f00
Version: 681e14730c73cc2c71af282c001de6bc71c22f00
Version: 681e14730c73cc2c71af282c001de6bc71c22f00
Version: 681e14730c73cc2c71af282c001de6bc71c22f00
Version: 681e14730c73cc2c71af282c001de6bc71c22f00
Version: 681e14730c73cc2c71af282c001de6bc71c22f00
Version: 681e14730c73cc2c71af282c001de6bc71c22f00
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/arkfb.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
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              "version": "0",
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              "version": "4.14.291",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvideo: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock()\n\nSince the user can control the arguments of the ioctl() from the user\nspace, under special arguments that may result in a divide-by-zero bug\nin:\n  drivers/video/fbdev/arkfb.c:784: ark_set_pixclock(info, (hdiv * info-\u003evar.pixclock) / hmul);\nwith hdiv=1, pixclock=1 and hmul=2 you end up with (1*1)/2 = (int) 0.\nand then in:\n  drivers/video/fbdev/arkfb.c:504: rv = dac_set_freq(par-\u003edac, 0, 1000000000 / pixclock);\nwe\u0027ll get a division-by-zero.\n\nThe following log can reveal it:\n\ndivide error: 0000 [#1] PREEMPT SMP KASAN PTI\nRIP: 0010:ark_set_pixclock drivers/video/fbdev/arkfb.c:504 [inline]\nRIP: 0010:arkfb_set_par+0x10fc/0x24c0 drivers/video/fbdev/arkfb.c:784\nCall Trace:\n fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034\n do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110\n fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189\n\nFix this by checking the argument of ark_set_pixclock() first."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:02:38.099Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/76b3f0a0b56e53a960a14624a0f48b3d94b5e7e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/b9a66f23612b84617e04412169e155a4b92f632d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a249e1b89ca25e1c34bdf96154e3f6224a91a9af"
        },
        {
          "url": "https://git.kernel.org/stable/c/0288fa799e273b08839037499d704dc7bdc13e9a"
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          "url": "https://git.kernel.org/stable/c/236c1502520b7b08955467ec2e50b3232e34f1f9"
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          "url": "https://git.kernel.org/stable/c/9ebc5031958c1f3a2795e4533b4091d77c738d14"
        },
        {
          "url": "https://git.kernel.org/stable/c/15661642511b2b192077684a89f42a8d95d54286"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f1c4523f7a3aaabe7e53d3ebd378292947e95c8"
        }
      ],
      "title": "video: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50102",
    "datePublished": "2025-06-18T11:02:38.099Z",
    "dateReserved": "2025-06-18T10:57:27.412Z",
    "dateUpdated": "2025-06-18T11:02:38.099Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50102\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:39.553\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvideo: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock()\\n\\nSince the user can control the arguments of the ioctl() from the user\\nspace, under special arguments that may result in a divide-by-zero bug\\nin:\\n  drivers/video/fbdev/arkfb.c:784: ark_set_pixclock(info, (hdiv * info-\u003evar.pixclock) / hmul);\\nwith hdiv=1, pixclock=1 and hmul=2 you end up with (1*1)/2 = (int) 0.\\nand then in:\\n  drivers/video/fbdev/arkfb.c:504: rv = dac_set_freq(par-\u003edac, 0, 1000000000 / pixclock);\\nwe\u0027ll get a division-by-zero.\\n\\nThe following log can reveal it:\\n\\ndivide error: 0000 [#1] PREEMPT SMP KASAN PTI\\nRIP: 0010:ark_set_pixclock drivers/video/fbdev/arkfb.c:504 [inline]\\nRIP: 0010:arkfb_set_par+0x10fc/0x24c0 drivers/video/fbdev/arkfb.c:784\\nCall Trace:\\n fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034\\n do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110\\n fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189\\n\\nFix this by checking the argument of ark_set_pixclock() first.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: video: fbdev: arkfb: Corrige un error de divisi\u00f3n por cero en ark_set_pixclock() Dado que el usuario puede controlar los argumentos de ioctl() desde el espacio de usuario, bajo argumentos especiales que pueden resultar en un error de divisi\u00f3n por cero en: drivers/video/fbdev/arkfb.c:784: ark_set_pixclock(info, (hdiv * info-\u0026gt;var.pixclock) / hmul); con hdiv=1, pixclock=1 y hmul=2 terminas con (1*1)/2 = (int) 0. y luego en: drivers/video/fbdev/arkfb.c:504: rv = dac_set_freq(par-\u0026gt;dac, 0, 1000000000 / pixclock); obtendremos una divisi\u00f3n por cero. El siguiente registro puede revelarlo: error de divisi\u00f3n: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:ark_set_pixclock drivers/video/fbdev/arkfb.c:504 [en l\u00ednea] RIP: 0010:arkfb_set_par+0x10fc/0x24c0 drivers/video/fbdev/arkfb.c:784 Rastreo de llamadas: fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189 Solucione esto marcando el argumento de ark_set_pixclock() primero.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0288fa799e273b08839037499d704dc7bdc13e9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/15661642511b2b192077684a89f42a8d95d54286\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/236c1502520b7b08955467ec2e50b3232e34f1f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2f1c4523f7a3aaabe7e53d3ebd378292947e95c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/76b3f0a0b56e53a960a14624a0f48b3d94b5e7e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ebc5031958c1f3a2795e4533b4091d77c738d14\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a249e1b89ca25e1c34bdf96154e3f6224a91a9af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b9a66f23612b84617e04412169e155a4b92f632d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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