GHSA-RWMP-XMG8-8R93

Vulnerability from github – Published: 2026-07-27 09:31 – Updated: 2026-07-30 06:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

staging: rtl8723bs: fix OOB reads in is_ap_in_tkip() IE loop

The loop in is_ap_in_tkip() iterates over IEs without verifying that enough bytes remain before dereferencing the IE header or its payload:

  • pIE->element_id and pIE->length are read without checking that i + sizeof(*pIE) <= ie_length, so a truncated IE at the end of the buffer causes an OOB read.

  • For WLAN_EID_VENDOR_SPECIFIC the code compares pIE->data + 12, which requires pIE->length >= 16. For WLAN_EID_RSN it compares pIE->data + 8, requiring pIE->length >= 12. Neither requirement is checked.

Add the missing IE header and payload bounds checks and guard each data access with an explicit pIE->length minimum, matching the pattern established in update_beacon_info().

Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-64536"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-27T08:16:22Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix OOB reads in is_ap_in_tkip() IE loop\n\nThe loop in is_ap_in_tkip() iterates over IEs without verifying that\nenough bytes remain before dereferencing the IE header or its payload:\n\n- pIE-\u003eelement_id and pIE-\u003elength are read without checking that\n  i + sizeof(*pIE) \u003c= ie_length, so a truncated IE at the end of the\n  buffer causes an OOB read.\n\n- For WLAN_EID_VENDOR_SPECIFIC the code compares pIE-\u003edata + 12,\n  which requires pIE-\u003elength \u003e= 16.  For WLAN_EID_RSN it compares\n  pIE-\u003edata + 8, requiring pIE-\u003elength \u003e= 12.  Neither requirement\n  is checked.\n\nAdd the missing IE header and payload bounds checks and guard each\ndata access with an explicit pIE-\u003elength minimum, matching the\npattern established in update_beacon_info().",
  "id": "GHSA-rwmp-xmg8-8r93",
  "modified": "2026-07-30T06:32:33Z",
  "published": "2026-07-27T09:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64536"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/204b22c8df115370037248859bf0fa62db73a396"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bf39f711ff27c64be8680a8938bcc5001982e81"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4380b3860d887a13555ff024a58dfc05b490dfd6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f26cc55affd9d7f88ae2f5d12db4ecf9072c209"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6105ea8ca6ebbc04beaf3bcbf7dbb5985f5d395"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2055332297e24c63fffda943ef7a5eefc0a6019"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea3809f7e20bdff282b8cc1e94937d5fb9fb32c7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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