ghsa-9mwp-3938-cj9r
Vulnerability from github
Published
2025-06-18 12:30
Modified
2025-06-18 12:30
Details

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

video: fbdev: i740fb: Check the argument of i740_calc_vclk()

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.

If the user provides an improper 'pixclock' value that makes the argumet of i740_calc_vclk() less than 'I740_RFREQ_FIX', it will cause a divide-by-zero bug in: drivers/video/fbdev/i740fb.c:353 p_best = min(15, ilog2(I740_MAX_VCO_FREQ / (freq / I740_RFREQ_FIX)));

The following log can reveal it:

divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:i740_calc_vclk drivers/video/fbdev/i740fb.c:353 [inline] RIP: 0010:i740fb_decode_var drivers/video/fbdev/i740fb.c:646 [inline] RIP: 0010:i740fb_set_par+0x163f/0x3b70 drivers/video/fbdev/i740fb.c:742 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 i740_calc_vclk() first.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50010"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T11:15:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvideo: fbdev: i740fb: Check the argument of i740_calc_vclk()\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.\n\nIf the user provides an improper \u0027pixclock\u0027 value that makes the argumet\nof i740_calc_vclk() less than \u0027I740_RFREQ_FIX\u0027, it will cause a\ndivide-by-zero bug in:\n    drivers/video/fbdev/i740fb.c:353 p_best = min(15, ilog2(I740_MAX_VCO_FREQ / (freq / I740_RFREQ_FIX)));\n\nThe following log can reveal it:\n\ndivide error: 0000 [#1] PREEMPT SMP KASAN PTI\nRIP: 0010:i740_calc_vclk drivers/video/fbdev/i740fb.c:353 [inline]\nRIP: 0010:i740fb_decode_var drivers/video/fbdev/i740fb.c:646 [inline]\nRIP: 0010:i740fb_set_par+0x163f/0x3b70 drivers/video/fbdev/i740fb.c:742\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 i740_calc_vclk() first.",
  "id": "GHSA-9mwp-3938-cj9r",
  "modified": "2025-06-18T12:30:41Z",
  "published": "2025-06-18T12:30:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50010"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b7f559152a33c55f51b569b22efbe5e24886798"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40bf722f8064f50200b8c4f8946cd625b441dda9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b20c61365140d432dee7da7aa294215e7b900d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/59cefb583c984c0da8cf21a4c57d26d5a20dff5c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/656689cb03ada4650016c153346939a1c334b1ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2d375eb68b4b8de6ea7460483a26fa9de56b443"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e740e787f06671455b59d1e498c9945f7b4e7b3b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f350812e2d15278f1d867eeb997407782234fb3c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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