CVE-2026-64174 (GCVE-0-2026-64174)
Vulnerability from cvelistv5
Published
2026-07-19 15:40
Modified
2026-07-19 15:40
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: fe806e4992c9047affd263bcc13b2c047029a726
Version: fe806e4992c9047affd263bcc13b2c047029a726
Version: fe806e4992c9047affd263bcc13b2c047029a726
Version: fe806e4992c9047affd263bcc13b2c047029a726
Version: fe806e4992c9047affd263bcc13b2c047029a726
Version: fe806e4992c9047affd263bcc13b2c047029a726
Version: fe806e4992c9047affd263bcc13b2c047029a726
Version: fe806e4992c9047affd263bcc13b2c047029a726
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:59.360Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6cfae4914439878b8acb35c7e3b40096eeb2ad9c"
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        {
          "url": "https://git.kernel.org/stable/c/7666dbb1bacc4ba522b96740cba7283d243d16e1"
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      "title": "wifi: cfg80211: advance loop vars in cfg80211_merge_profile()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64174",
    "datePublished": "2026-07-19T15:40:59.360Z",
    "dateReserved": "2026-07-19T07:54:57.039Z",
    "dateUpdated": "2026-07-19T15:40:59.360Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}


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