CVE-2026-89524 (GCVE-0-2026-89524)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:48
Severity ?
8.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets ath6kl_cfg80211_connect_event() subtracts fixed IE offsets from assoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower bound. The aggregate check recently added to ath6kl_wmi_connect_event_rx() bounds the declared lengths from above (their sum must fit the received event), but an assoc request/response shorter than its fixed offset still underflows here: the u8 wraps to ~250, and cfg80211_connect_result() / cfg80211_roamed() then treat that wrapped value as the IE length and copy that many bytes out of the small assoc_info buffer to user space via nl80211, disclosing adjacent slab memory. Clamp both lengths to their offsets before subtracting. Found by 0sec (https://0sec.ai) using automated source analysis; the missing lower bound is evident from source. Compile-tested.
References
Impacted products
Vendor Product Version
Linux Linux Version: bdcd81707973cf8aa9305337166f8ee842a050d4
Version: bdcd81707973cf8aa9305337166f8ee842a050d4
Version: bdcd81707973cf8aa9305337166f8ee842a050d4
Version: bdcd81707973cf8aa9305337166f8ee842a050d4
Version: bdcd81707973cf8aa9305337166f8ee842a050d4
Version: bdcd81707973cf8aa9305337166f8ee842a050d4
Version: bdcd81707973cf8aa9305337166f8ee842a050d4
Version: bdcd81707973cf8aa9305337166f8ee842a050d4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath6kl/cfg80211.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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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": "3.2"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.157",
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "3.2",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets\n\nath6kl_cfg80211_connect_event() subtracts fixed IE offsets from\nassoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower\nbound. The aggregate check recently added to ath6kl_wmi_connect_event_rx()\nbounds the declared lengths from above (their sum must fit the received\nevent), but an assoc request/response shorter than its fixed offset still\nunderflows here: the u8 wraps to ~250, and cfg80211_connect_result() /\ncfg80211_roamed() then treat that wrapped value as the IE length and copy\nthat many bytes out of the small assoc_info buffer to user space via\nnl80211, disclosing adjacent slab memory.\n\nClamp both lengths to their offsets before subtracting.\n\nFound by 0sec (https://0sec.ai) using automated source analysis; the\nmissing lower bound is evident from source. Compile-tested."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - ath6kl is a fullMAC WiFi driver; assoc_req_len/assoc_resp_len come from a WMI_CONNECT_EVENT built from the 802.11 association exchange. A rogue or evil-twin AP, or a frame injector in radio range, supplies a truncated assoc/reassoc response, so the attacker must share the wireless segment.\nAC:L - A malicious AP can send a truncated association or reassociation response so firmware reports assoc_req_len \u003c 4 or assoc_resp_len \u003c 6. The u8 subtraction wraps deterministically and cfg80211 copies the wrapped length; the attacker can force (re)association or roaming with deauth until the event is emitted.\nPR:N - The WMI connect event is handled on the firmware receive path with no capability check, local account, or user-namespace gate. An adjacent attacker needs no privileges on the victim system.\nUI:N - Devices with a saved or open profile auto-associate, and the SME_CONNECTED roam path (cfg80211_roamed) delivers the same underflowed IEs while already connected, so no extra victim action is required.\nS:U - The out-of-bounds read, kernel-memory disclosure, and any resulting oops stay inside the host kernel\u0027s security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After the u8 wrap, cfg80211_connect_result()/cfg80211_roamed() treat ~250-byte lengths as IE sizes and copy that many bytes from the small assoc_info skb into nl80211 CONNECT/ROAM events (and WEXT assoc IE events), disclosing adjacent slab memory far beyond a few bytes.\nI:N - The underflow only inflates the length used for an out-of-bounds read and copy to userspace; no kernel memory is written out of bounds and no attacker-controlled pointer is used to modify kernel state.\nA:H - Copying ~250 bytes past a short WMI skb can walk off the slab object into unmapped or redzoned memory, causing a kernel oops or KASAN panic that an adjacent attacker can retrigger by repeating association."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:48:15.538Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/225587bdbf4b0eb5265a71ee4dc183561a1857fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/d337213a889705a69735079606d0b4c672b17605"
        },
        {
          "url": "https://git.kernel.org/stable/c/e11d5ae96d5e52cb48fa27c6ad352d766d0322fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815"
        },
        {
          "url": "https://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613"
        }
      ],
      "title": "wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89524",
    "datePublished": "2026-09-11T19:44:05.548Z",
    "dateReserved": "2026-09-11T19:38:34.719Z",
    "dateUpdated": "2026-10-19T08:48:15.538Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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