PT-2026-53877 · W1.Fi · Hostapd

Published 2026-06-30 · Updated 2026-06-30 · CVE-2026-58374

NVD

CVSS v3.1

6.5

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Weakness Enumeration

CWE-193

Related Identifiers

CVE-2026-58374

Affected Products

Hostapd

References · 6

• https://w1.fi/security/2026-1/missing-ml-parsing-validation.txt · Vendor Advisory
• https://git.w1.fi/cgit/hostap/commit/?id=46dd5a4ffc9bcf44cf8fc45120b3e1e5ec922187 · Patch
• https://git.w1.fi/cgit/hostap/commit/?id=aa9d345887389a251c63a3781d2ad2940d079193 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-58374 · Security Note
• https://openwall.com/lists/oss-security/2026/06/30/1 · Note
• https://w1.fi/security/2026-1 · Patch, Vendor Advisory