Vulnerability Description
In hostapd before 2.12, a missing bounds check in AP-mode Wi-Fi 7 (IEEE 802.11be) Multi-Link Operation (MLO) association request processing allows an unauthenticated attacker within wireless range to send a crafted management frame containing a malformed Multi-Link Element or Per-STA Profile subelement. In hostapd_process_ml_assoc_req() in src/ap/ieee802_11_eht.c, the received link_id field can be parsed as value 15, but the corresponding links[] storage only has valid entries for lower link IDs (0 through 14). This causes an out-of-bounds write / small memory corruption during association processing before the 4-way handshake. The attack does not require network credentials, prior authentication, or user interaction. The confirmed practical impact is denial of service through hostapd process termination. This affects hostapd v2.11 and newer development snapshots before v2.12 when built with CONFIG_IEEE80211BE enabled. The issue is fixed in hostapd v2.12 and the upstream 2026-1 fixes.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| W1.Fi | Hostapd | <= 2.11 |
Related Weaknesses (CWE)
References
- https://git.w1.fi/cgit/hostap/commit/?id=46dd5a4ffc9bcf44cf8fc45120b3e1e5ec92218Patch
- https://git.w1.fi/cgit/hostap/commit/?id=aa9d345887389a251c63a3781d2ad2940d07919Patch
- https://w1.fi/security/2026-1/Issue Tracking
- https://w1.fi/security/2026-1/missing-ml-parsing-validation.txtMitigationThird Party Advisory
- https://www.openwall.com/lists/oss-security/2026/06/30/1Mailing ListMitigationPatch
FAQ
What is CVE-2026-58374?
CVE-2026-58374 is a vulnerability with a CVSS score of 6.5 (MEDIUM). In hostapd before 2.12, a missing bounds check in AP-mode Wi-Fi 7 (IEEE 802.11be) Multi-Link Operation (MLO) association request processing allows an unauthenticated attacker within wireless range to ...
How severe is CVE-2026-58374?
CVE-2026-58374 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58374?
Check the references section above for vendor advisories and patch information. Affected products include: W1.Fi Hostapd.