CVE-2026-93784 (GCVE-0-2026-93784)
Vulnerability from cvelistv5
Published
2026-09-24 16:02
Modified
2026-10-03 10:57
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie() The KASAN allocation trace shows that a malformed IE buffer is stored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any validation. The crash trace shows that a subsequent SIOCSIWESSID triggers a connection attempt which calls cfg80211_sme_get_conn_ies() to process the stored IE buffer, causing: - An out-of-bounds read in skip_ie() which reads ies[pos+1] (the length byte) past the end of the 1-byte buffer. - An integer underflow in the memcpy size argument when offs returned by ieee80211_ie_split() exceeds ies_len, causing unsigned subtraction to wrap to SIZE_MAX and triggering a fortify panic. Fix this by validating the IE buffer in cfg80211_wext_siwgenie() before storing it. [drop unnecessary ie_len check, update commit message]
References
Impacted products
Vendor Product Version
Linux Linux Version: f21293549f60f88c74fcb9944737f11048896dc4
Version: f21293549f60f88c74fcb9944737f11048896dc4
Version: f21293549f60f88c74fcb9944737f11048896dc4
Version: f21293549f60f88c74fcb9944737f11048896dc4
Version: f21293549f60f88c74fcb9944737f11048896dc4
Version: f21293549f60f88c74fcb9944737f11048896dc4
Version: f21293549f60f88c74fcb9944737f11048896dc4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/wireless/wext-sme.c"
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "2.6.32"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "5.10.271",
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
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            {
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              "status": "unaffected",
              "version": "6.1.189",
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            {
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              "status": "unaffected",
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
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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: cfg80211: validate IEs in cfg80211_wext_siwgenie()\n\nThe KASAN allocation trace shows that a malformed IE buffer is\nstored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any\nvalidation. The crash trace shows that a subsequent SIOCSIWESSID\ntriggers a connection attempt which calls cfg80211_sme_get_conn_ies()\nto process the stored IE buffer, causing:\n\n - An out-of-bounds read in skip_ie() which reads ies[pos+1]\n   (the length byte) past the end of the 1-byte buffer.\n\n - An integer underflow in the memcpy size argument when offs\n   returned by ieee80211_ie_split() exceeds ies_len, causing\n   unsigned subtraction to wrap to SIZE_MAX and triggering a\n   fortify panic.\n\nFix this by validating the IE buffer in cfg80211_wext_siwgenie()\nbefore storing it.\n\n[drop unnecessary ie_len check, update commit message]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-03T10:57:19.164Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/269498ce6c1e2132b072aa0c8660404926008f03"
        },
        {
          "url": "https://git.kernel.org/stable/c/685082f4be77f4657b498ebbe9f942ef65c492cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b921a8993469a3482e0c67b5ce5cb6ce93f5f61"
        },
        {
          "url": "https://git.kernel.org/stable/c/d01f1600e8b075aa17adb751ac9881bb6ee40dcc"
        },
        {
          "url": "https://git.kernel.org/stable/c/c970879e03b23a27df42caf7ba506485a165fb96"
        },
        {
          "url": "https://git.kernel.org/stable/c/01cc395cecfaa73134d39fb9a401d9605d8bb2c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/a2f5286ca4f304d3fd469f01b96b518608912a5c"
        }
      ],
      "title": "wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93784",
    "datePublished": "2026-09-24T16:02:18.067Z",
    "dateReserved": "2026-09-18T17:59:28.788Z",
    "dateUpdated": "2026-10-03T10:57:19.164Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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