CVE-2026-93784 (GCVE-0-2026-93784)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:02 – Updated: 2026-10-03 10:57
VLAI
Title
wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()
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]
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6856 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f21293549f60f88c74fcb9944737f11048896dc4 , < 269498ce6c1e2132b072aa0c8660404926008f03 (git)
Affected: f21293549f60f88c74fcb9944737f11048896dc4 , < 685082f4be77f4657b498ebbe9f942ef65c492cf (git)
Affected: f21293549f60f88c74fcb9944737f11048896dc4 , < 8b921a8993469a3482e0c67b5ce5cb6ce93f5f61 (git)
Affected: f21293549f60f88c74fcb9944737f11048896dc4 , < d01f1600e8b075aa17adb751ac9881bb6ee40dcc (git)
Affected: f21293549f60f88c74fcb9944737f11048896dc4 , < c970879e03b23a27df42caf7ba506485a165fb96 (git)
Affected: f21293549f60f88c74fcb9944737f11048896dc4 , < 01cc395cecfaa73134d39fb9a401d9605d8bb2c5 (git)
Affected: f21293549f60f88c74fcb9944737f11048896dc4 , < a2f5286ca4f304d3fd469f01b96b518608912a5c (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.32
Unaffected: 0 , < 2.6.32 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        {
          "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": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2026-09-24T16:02:18.067Z",
    "dateReserved": "2026-09-18T17:59:28.788Z",
    "dateUpdated": "2026-10-03T10:57:19.164Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-10-21",
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      "percentile": "0.06338"
    },
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      "cve": "CVE-2026-93784",
      "id": "msrc_CVE-2026-93784",
      "initial_release_date": "2026-09-28T02:29:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-93784.json",
      "version": "3"
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            "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]"
          }
        ],
        "id": "CVE-2026-93784",
        "lastModified": "2026-10-03T11:17:47.927",
        "metrics": {},
        "published": "2026-09-24T17:17:11.017",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-09-28T23:44:10Z",
      "cve": "CVE-2026-93784",
      "id": "CVE-2026-93784",
      "initial_release_date": "2026-09-28T23:44:10Z",
      "product_status:known_affected": "306",
      "product_status:known_not_affected": "41",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93784",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93784.json",
      "version": "2"
    }
  }
}



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