GHSA-CFFR-QFXF-QJR4

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31
VLAI
Details

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

staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop

The IE parsing loop in update_beacon_info() advances by (pIE->length + 2) each iteration but only guards on i < len. When a malicious AP sends a Beacon whose last IE has only one byte remaining in the frame (the element_id byte lands at len-1), the loop reads pIE->length from one byte past the allocated receive buffer.

Additionally, even when the header bytes are in bounds, pIE->length itself can extend the data window beyond len, passing a truncated IE to the handler functions.

Add two guards at the top of the loop body: 1. Break if fewer than sizeof(*pIE) bytes remain (can't read header). 2. Break if the IE's declared data extends past len.

Also replace i += (pIE->length + 2) with i += sizeof(pIE) + pIE->length for consistency with the sizeof(pIE) guards added above.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64443"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix OOB read in update_beacon_info() IE loop\n\nThe IE parsing loop in update_beacon_info() advances by\n(pIE-\u003elength + 2) each iteration but only guards on i \u003c len.\nWhen a malicious AP sends a Beacon whose last IE has only one byte\nremaining in the frame (the element_id byte lands at len-1), the loop\nreads pIE-\u003elength from one byte past the allocated receive buffer.\n\nAdditionally, even when the header bytes are in bounds, pIE-\u003elength\nitself can extend the data window beyond len, passing a truncated IE\nto the handler functions.\n\nAdd two guards at the top of the loop body:\n  1. Break if fewer than sizeof(*pIE) bytes remain (can\u0027t read header).\n  2. Break if the IE\u0027s declared data extends past len.\n\nAlso replace i += (pIE-\u003elength + 2) with i += sizeof(*pIE) + pIE-\u003elength\nfor consistency with the sizeof(*pIE) guards added above.",
  "id": "GHSA-cffr-qfxf-qjr4",
  "modified": "2026-07-25T12:31:36Z",
  "published": "2026-07-25T12:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64443"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69f174a0673b6b7a29b851adb60bc450cdc0ecc4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6dd5e8c3011ebabf417257d7f07901a7c4311539"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9193c34f75fd9e1ea8a590d7cced464c3380dc29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5cc2f999927f69723ca53f1f2a3aa37dbeda907"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd953d52d587d42365e399b96c52dbdb13032070"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed51de4a86e173c3b0ef78e039c2e49e08b11f16"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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