GHSA-J7Q2-V7Q5-76JP
Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31In the Linux kernel, the following vulnerability has been resolved:
wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()
The KASAN allocation trace shows that a malformed IE buffer is stored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any validation. The crash trace shows that a subsequent SIOCSIWESSID triggers a connection attempt which calls cfg80211_sme_get_conn_ies() to process the stored IE buffer, causing:
-
An out-of-bounds read in skip_ie() which reads ies[pos+1] (the length byte) past the end of the 1-byte buffer.
-
An integer underflow in the memcpy size argument when offs returned by ieee80211_ie_split() exceeds ies_len, causing unsigned subtraction to wrap to SIZE_MAX and triggering a fortify panic.
Fix this by validating the IE buffer in cfg80211_wext_siwgenie() before storing it.
[drop unnecessary ie_len check, update commit message]
{
"affected": [],
"aliases": [
"CVE-2026-93784"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-24T17:17:11Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()\n\nThe KASAN allocation trace shows that a malformed IE buffer is\nstored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any\nvalidation. The crash trace shows that a subsequent SIOCSIWESSID\ntriggers a connection attempt which calls cfg80211_sme_get_conn_ies()\nto process the stored IE buffer, causing:\n\n - An out-of-bounds read in skip_ie() which reads ies[pos+1]\n (the length byte) past the end of the 1-byte buffer.\n\n - An integer underflow in the memcpy size argument when offs\n returned by ieee80211_ie_split() exceeds ies_len, causing\n unsigned subtraction to wrap to SIZE_MAX and triggering a\n fortify panic.\n\nFix this by validating the IE buffer in cfg80211_wext_siwgenie()\nbefore storing it.\n\n[drop unnecessary ie_len check, update commit message]",
"id": "GHSA-j7q2-v7q5-76jp",
"modified": "2026-09-24T18:31:28Z",
"published": "2026-09-24T18:31:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93784"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/01cc395cecfaa73134d39fb9a401d9605d8bb2c5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a2f5286ca4f304d3fd469f01b96b518608912a5c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c970879e03b23a27df42caf7ba506485a165fb96"
}
],
"schema_version": "1.4.0",
"severity": []
}
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.