CVE-2026-98186 (GCVE-0-2026-98186)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:44 – Updated: 2026-10-06 08:44
VLAI
Title
wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length mwifiex_search_oui_in_ie() reads a pairwise-cipher (PTK) count from a beacon/probe-response RSN or WPA information element and then walks that many 4-byte OUIs, comparing each with memcmp(). The count comes straight from the (attacker-supplied) IE and is never checked against the element's own length, and the callers admit the element on element_id alone (has_ieee_hdr() / has_vendor_hdr(), no length check). A crafted RSN/WPA IE with a large pairwise count therefore makes the walk read up to 255 * 4 bytes past the element -- an out-of-bounds read of the kmemdup()'d beacon buffer, reachable from any AP whose beacon/probe response is processed during scan-result parsing. Pass the number of IE bytes available at the OUI list and bound the walk to the element. Keep the length signed and reject a negative value before any unsigned arithmetic, so a small or zero IE length cannot underflow to a large size_t and defeat the bound. Found by 0sec automated security-research tooling (https://0sec.ai).
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6618 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e , < 77e642af7f2f6029e12a35c847c56cbd0466e799 (git)
Affected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e , < 982b8fcdbb28f63bbbf02f0822c0bbda12ec27ed (git)
Affected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e , < 58767b41f87244eebaa5a475b9d276c83b89b933 (git)
Affected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e , < 2402c9e2644b7e10c7aaaf87bf12743d7e363559 (git)
Affected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e , < 54a9cc5bd70b0d77a5069d4c46998c679a10c857 (git)
Affected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e , < 8bbef2b1ebfbadc0b9c37bbbf9c9e26fe2e41960 (git)
Affected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e , < 46cda9d42f0d6ec3057d878ddb1f38c0ab9f51df (git)
Affected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e , < e667aee1c192d67d27c803007bfa9c6e0873e959 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.0
Unaffected: 0 , < 3.0 (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: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length\n\nmwifiex_search_oui_in_ie() reads a pairwise-cipher (PTK) count from a\nbeacon/probe-response RSN or WPA information element and then walks that\nmany 4-byte OUIs, comparing each with memcmp(). The count comes straight\nfrom the (attacker-supplied) IE and is never checked against the\nelement\u0027s own length, and the callers admit the element on element_id\nalone (has_ieee_hdr() / has_vendor_hdr(), no length check). A crafted\nRSN/WPA IE with a large pairwise count therefore makes the walk read up\nto 255 * 4 bytes past the element -- an out-of-bounds read of the\nkmemdup()\u0027d beacon buffer, reachable from any AP whose beacon/probe\nresponse is processed during scan-result parsing.\n\nPass the number of IE bytes available at the OUI list and bound the walk\nto the element. Keep the length signed and reject a negative value\nbefore any unsigned arithmetic, so a small or zero IE length cannot\nunderflow to a large size_t and defeat the bound.\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T08:44:28.429Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/77e642af7f2f6029e12a35c847c56cbd0466e799"
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        {
          "url": "https://git.kernel.org/stable/c/982b8fcdbb28f63bbbf02f0822c0bbda12ec27ed"
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          "url": "https://git.kernel.org/stable/c/58767b41f87244eebaa5a475b9d276c83b89b933"
        },
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          "url": "https://git.kernel.org/stable/c/2402c9e2644b7e10c7aaaf87bf12743d7e363559"
        },
        {
          "url": "https://git.kernel.org/stable/c/54a9cc5bd70b0d77a5069d4c46998c679a10c857"
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        },
        {
          "url": "https://git.kernel.org/stable/c/e667aee1c192d67d27c803007bfa9c6e0873e959"
        }
      ],
      "title": "wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98186",
    "datePublished": "2026-10-06T08:44:28.429Z",
    "dateReserved": "2026-09-25T10:25:14.323Z",
    "dateUpdated": "2026-10-06T08:44:28.429Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length\n\nmwifiex_search_oui_in_ie() reads a pairwise-cipher (PTK) count from a\nbeacon/probe-response RSN or WPA information element and then walks that\nmany 4-byte OUIs, comparing each with memcmp(). The count comes straight\nfrom the (attacker-supplied) IE and is never checked against the\nelement\u0027s own length, and the callers admit the element on element_id\nalone (has_ieee_hdr() / has_vendor_hdr(), no length check). A crafted\nRSN/WPA IE with a large pairwise count therefore makes the walk read up\nto 255 * 4 bytes past the element -- an out-of-bounds read of the\nkmemdup()\u0027d beacon buffer, reachable from any AP whose beacon/probe\nresponse is processed during scan-result parsing.\n\nPass the number of IE bytes available at the OUI list and bound the walk\nto the element. Keep the length signed and reject a negative value\nbefore any unsigned arithmetic, so a small or zero IE length cannot\nunderflow to a large size_t and defeat the bound.\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."
          }
        ],
        "id": "CVE-2026-98186",
        "lastModified": "2026-10-06T09:18:03.540",
        "metrics": {},
        "published": "2026-10-06T09:18:03.540",
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            "url": "https://git.kernel.org/stable/c/e667aee1c192d67d27c803007bfa9c6e0873e959"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-09T01:29:52+00:00",
      "cve": "CVE-2026-98186",
      "id": "CVE-2026-98186",
      "initial_release_date": "2026-10-06T00:00:00+00:00",
      "product_status:known_affected": "263",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98186.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-08T16:51:11Z",
      "cve": "CVE-2026-98186",
      "id": "CVE-2026-98186",
      "initial_release_date": "2026-10-08T16:51:11Z",
      "product_status:known_affected": "301",
      "product_status:known_not_affected": "46",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98186",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98186.json",
      "version": "2"
    }
  }
}



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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.