GHSA-849J-9CQ7-9MPX
Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31In the Linux kernel, the following vulnerability has been resolved:
staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()
rtw_get_wpa_ie() reads bytes at fixed offsets into a vendor-specific information element without checking that the element is long enough, causing an out-of-bounds read for a short trailing IE.
The function locates a vendor-specific IE (EID 221) with rtw_get_ie() and then compares a 4-byte OUI+type at pbuf + 2 and reads a 2-byte version word at pbuf + 6. Those accesses require the IE body to be at least 6 bytes, but rtw_get_ie() only guarantees that the element fits within the buffer; it does not enforce a minimum body length. A vendor-specific IE whose length byte is 0 to 5, placed at the end of the buffer, therefore makes these reads run past the end of the IE and past the end of the buffer itself.
The buffer holds information elements taken from received management frames and from the IE blob passed to rtw_cfg80211_set_wpa_ie(), which is kmemdup'd to its exact length, so the read can run off the end of the allocation.
The sibling helpers rtw_get_sec_ie(), rtw_get_wapi_ie() and rtw_get_wps_ie() in this file already reject too-short vendor-specific IEs before their OUI memcmp(); rtw_get_wpa_ie() was never brought in line with them, and needs a minimum of 6 rather than 4 bytes because of the version word. Add the missing length check.
{
"affected": [],
"aliases": [
"CVE-2026-74651"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-22T16:16:38Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()\n\nrtw_get_wpa_ie() reads bytes at fixed offsets into a vendor-specific\ninformation element without checking that the element is long enough,\ncausing an out-of-bounds read for a short trailing IE.\n\nThe function locates a vendor-specific IE (EID 221) with rtw_get_ie()\nand then compares a 4-byte OUI+type at pbuf + 2 and reads a 2-byte\nversion word at pbuf + 6. Those accesses require the IE body to be at\nleast 6 bytes, but rtw_get_ie() only guarantees that the element fits\nwithin the buffer; it does not enforce a minimum body length. A\nvendor-specific IE whose length byte is 0 to 5, placed at the end of\nthe buffer, therefore makes these reads run past the end of the IE and\npast the end of the buffer itself.\n\nThe buffer holds information elements taken from received management\nframes and from the IE blob passed to rtw_cfg80211_set_wpa_ie(), which\nis kmemdup\u0027d to its exact length, so the read can run off the end of\nthe allocation.\n\nThe sibling helpers rtw_get_sec_ie(), rtw_get_wapi_ie() and\nrtw_get_wps_ie() in this file already reject too-short vendor-specific\nIEs before their OUI memcmp(); rtw_get_wpa_ie() was never brought in\nline with them, and needs a minimum of 6 rather than 4 bytes because\nof the version word. Add the missing length check.",
"id": "GHSA-849j-9cq7-9mpx",
"modified": "2026-08-25T06:31:25Z",
"published": "2026-08-22T18:30:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74651"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/01ab275f8f3e497a13ebbe4ded44ec0623bccde3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0d19f0600fbb610c42f2a86f95c35706dc04691b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1c3e23e78862493e8cf1adad02b10ffcb8b9921c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/42c5a0d454aa5b54fec17162d9a1f8c30f8af45a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4fc459c5cd8767ca4d9bf2f7becbd562639ba4d9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b45be82387bf759931acdd21ca7dfe740f16eb97"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c9068f82a0906b29c905e8788edb62c3208c7c8a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e167a38a8a8f50f137721fef1a1fbba0f4588b5d"
}
],
"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"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.