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GHSA-9FP4-X69F-GF9F

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:31
VLAI
Details

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

staging: rtl8723bs: fix OOB read in rtw_action_frame_parse()

rtw_action_frame_parse() takes a frame_len parameter but never actually checks it before indexing into the frame body:

const u8 *frame_body = frame + sizeof(struct ieee80211_hdr_3addr);
...
c = frame_body[0];
...
a = frame_body[1];

frame_body already points 24 bytes (sizeof(struct ieee80211_hdr_3addr)) into frame, so reading frame_body[0] and frame_body[1] requires frame_len >= 26. A management action frame shorter than that (e.g. exactly 24 bytes, the minimum a malicious peer can send) causes a 1-2 byte out-of-bounds read.

This is reachable from rtw_cfg80211_monitor_if_xmit_entry() and cfg80211_rtw_mgmt_tx() in ioctl_cfg80211.c, both of which pass attacker/user-influenced frame buffers and lengths straight through.

Add the missing length check before frame_body is dereferenced.

Severity
7.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2026-90017"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:17:14Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix OOB read in rtw_action_frame_parse()\n\nrtw_action_frame_parse() takes a frame_len parameter but never\nactually checks it before indexing into the frame body:\n\n\tconst u8 *frame_body = frame + sizeof(struct ieee80211_hdr_3addr);\n\t...\n\tc = frame_body[0];\n\t...\n\ta = frame_body[1];\n\nframe_body already points 24 bytes (sizeof(struct\nieee80211_hdr_3addr)) into frame, so reading frame_body[0] and\nframe_body[1] requires frame_len \u003e= 26. A management action frame\nshorter than that (e.g. exactly 24 bytes, the minimum a malicious\npeer can send) causes a 1-2 byte out-of-bounds read.\n\nThis is reachable from rtw_cfg80211_monitor_if_xmit_entry() and\ncfg80211_rtw_mgmt_tx() in ioctl_cfg80211.c, both of which pass\nattacker/user-influenced frame buffers and lengths straight through.\n\nAdd the missing length check before frame_body is dereferenced.",
  "id": "GHSA-9fp4-x69f-gf9f",
  "modified": "2026-09-16T15:31:07Z",
  "published": "2026-09-16T12:30:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90017"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0b7f64c7bb9664777168768c6b44affb07dcbf24"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/136f9a3ab87ded8aaf081425cfb2059659dd9023"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1410bce22351ba15d8e58287cbf09d55d7f21fc9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15081ff835b29e456da29303b32efc436df04695"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/310aaa8058d19cc431aedac0f5bb814e84479393"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a54fd1a44862d263df9f8bc17fca3620be31addb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b041e3f35e0d262d42a711094ab594634d72744a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff917923f4fb9c83717ba135ee47d7e4c1567bb7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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