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wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-89524

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89524

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
        "lessThan": "225587bdbf4b0eb5265a71ee4dc183561a1857fc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
        "lessThan": "d337213a889705a69735079606d0b4c672b17605",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
        "lessThan": "e11d5ae96d5e52cb48fa27c6ad352d766d0322fb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
        "lessThan": "6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
        "lessThan": "e3619bed5da125713b29ac881dc66f5e06606f88",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
        "lessThan": "e1330d719c047c4d8190a16be034b29fc601a815",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
        "lessThan": "8eb73016fb3968cf2db3987a92764563a3af773a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
        "lessThan": "3bbd05723d15dd06f0560bcd94fbf9a91b5f5613",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/wireless/ath/ath6kl/cfg80211.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/wireless/ath/ath6kl/cfg80211.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89524

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35050 · Revision 1
Added to Heist Feed
Publisher date
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