GHSA-RRG8-QCW5-J3CM

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31
VLAI
Details

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

wifi: cfg80211: advance loop vars in cfg80211_merge_profile()

cfg80211_merge_profile() reassembles a Multi-BSSID non-transmitted BSS profile that has been split across multiple consecutive MBSSID elements. Its while-loop calls

cfg80211_get_profile_continuation(ie, ielen, mbssid_elem, sub_elem)

but never advances mbssid_elem or sub_elem inside the body. Each iteration therefore searches for a continuation that follows the same fixed pair; the helper returns the same next_mbssid; and the same next_sub bytes are memcpy()'d into merged_ie at a growing offset until the buffer fills.

Advance both mbssid_elem and sub_elem to the just-consumed continuation so the next call to cfg80211_get_profile_continuation() searches for a further continuation beyond it (or returns NULL when none exists).

A specially-crafted malicious beacon can take advantage of this bug to cause the kernel to spend an excessive amount of time in cfg80211_merge_profile (up to as much as 2ms per beacon received), which could theoretically be abused in some way.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64174"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:59Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: advance loop vars in cfg80211_merge_profile()\n\ncfg80211_merge_profile() reassembles a Multi-BSSID non-transmitted BSS\nprofile that has been split across multiple consecutive MBSSID elements.\nIts while-loop calls\n\n\tcfg80211_get_profile_continuation(ie, ielen, mbssid_elem, sub_elem)\n\nbut never advances mbssid_elem or sub_elem inside the body.  Each\niteration therefore searches for a continuation that follows the same\nfixed pair; the helper returns the same next_mbssid; and the same\nnext_sub bytes are memcpy()\u0027d into merged_ie at a growing offset until\nthe buffer fills.\n\nAdvance both mbssid_elem and sub_elem to the just-consumed continuation\nso the next call to cfg80211_get_profile_continuation() searches for a\nfurther continuation beyond it (or returns NULL when none exists).\n\nA specially-crafted malicious beacon can take advantage of this bug\nto cause the kernel to spend an excessive amount of time in\ncfg80211_merge_profile (up to as much as 2ms per beacon received),\nwhich could theoretically be abused in some way.",
  "id": "GHSA-rrg8-qcw5-j3cm",
  "modified": "2026-07-19T18:31:54Z",
  "published": "2026-07-19T18:31:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64174"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1343a480f84b80c1249133a90ef87f8751d65cbb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ced0f5a851f9cae274545a42a06c459b7fd8881"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5817e1e5205498a5df66eba2b34e817f4210fd0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67915715fd3874057457363c87c63e18829527df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6cfae4914439878b8acb35c7e3b40096eeb2ad9c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7666dbb1bacc4ba522b96740cba7283d243d16e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0bc4c8bd556cbe036a5b9ed333c0aab9aadfcb8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cedbb608494ba1e7a5c6c56b7f1d3fd470094f28"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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