CVE-2026-98703 (GCVE-0-2026-98703)
Vulnerability from cvelistv5
Published
2026-10-18 15:46
Modified
2026-10-21 12:55
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: minstrel_ht: validate fixed rate index The fixed_rate_idx debugfs file is a plain u32 attribute, so any value can be written to it. minstrel_ht_update_stats() then copies the value into mi->max_tp_rate[] and mi->max_prob_rate, and minstrel_ht_set_rate() uses MI_RATE_GROUP()/MI_RATE_IDX() to index minstrel_mcs_groups[] (42 entries) and mi->groups[].rates[] (10 entries) with it. Writing e.g. 65535 selects group 4095 and rate index 15, far outside both arrays. The out-of-bounds entries are dereferenced and updated as struct minstrel_rate_stats (retry counts, etc.), so the invalid index corrupts adjacent kernel memory. With CONFIG_UBSAN_BOUNDS the access is reported as an array-index-out-of-bounds in minstrel_ht_set_rate(). Only a valid group/rate pair, or U32_MAX to disable fixed rate processing, can be used safely, so reject any other value when the debugfs file is written. The file is only reachable through a root-only debugfs mount, so this is not a privilege boundary. The out-of-bounds access is still a bug that must not be reachable through a writable debugfs attribute.
References
Impacted products
Vendor Product Version
Linux Linux Version: 24f7580e852b5472b51eea322bb78454df0054b8
Version: 24f7580e852b5472b51eea322bb78454df0054b8
Version: 24f7580e852b5472b51eea322bb78454df0054b8
Version: 24f7580e852b5472b51eea322bb78454df0054b8
Version: 24f7580e852b5472b51eea322bb78454df0054b8
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/rc80211_minstrel_ht.c"
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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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\nwifi: mac80211: minstrel_ht: validate fixed rate index\n\nThe fixed_rate_idx debugfs file is a plain u32 attribute, so any value\ncan be written to it.  minstrel_ht_update_stats() then copies the value\ninto mi-\u003emax_tp_rate[] and mi-\u003emax_prob_rate, and\nminstrel_ht_set_rate() uses MI_RATE_GROUP()/MI_RATE_IDX() to index\nminstrel_mcs_groups[] (42 entries) and mi-\u003egroups[].rates[] (10 entries)\nwith it.\n\nWriting e.g. 65535 selects group 4095 and rate index 15, far outside\nboth arrays.  The out-of-bounds entries are dereferenced and updated as\nstruct minstrel_rate_stats (retry counts, etc.), so the invalid index\ncorrupts adjacent kernel memory.  With CONFIG_UBSAN_BOUNDS the access is\nreported as an array-index-out-of-bounds in minstrel_ht_set_rate().\n\nOnly a valid group/rate pair, or U32_MAX to disable fixed rate\nprocessing, can be used safely, so reject any other value when the\ndebugfs file is written.\n\nThe file is only reachable through a root-only debugfs mount, so this is\nnot a privilege boundary.  The out-of-bounds access is still a bug that\nmust not be reachable through a writable debugfs attribute."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:55:51.935Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eebc70f132041b35da9ec74d5d395083125289b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8ab6ae1fa360b0191252677f41e781dcb0ffe6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/42aa9feb27b600809414a3c6b0c650bafba542a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/43082d604a9937b94ceb2e484403956d0f363324"
        },
        {
          "url": "https://git.kernel.org/stable/c/15fb9e3cea55fbc378261ce35a32b0f8828f0000"
        }
      ],
      "title": "wifi: mac80211: minstrel_ht: validate fixed rate index",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98703",
    "datePublished": "2026-10-18T15:46:33.395Z",
    "dateReserved": "2026-09-25T10:25:14.365Z",
    "dateUpdated": "2026-10-21T12:55:51.935Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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