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CVE-2026-56101— OpenBSD ieee80211_crypto_tkip.c TKIP MIC Countermeasure Logic Inversion DoS

Quick assessment

Affected
OpenBSD OpenBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在提交 1ee99df 之前的 OpenBSD 版本中， 文件中的 函数存在一个比较逻辑反转的漏洞。该漏洞允许处于无线信号（RF）范围内的非认证攻击者，通过发送两个间隔超过 60 秒的格式错误的 TKIP 帧来触发服务拒绝（DoS）攻击。 攻击者可以利用反向的 TKIP MIC 失败反制窗口检查，使所有已关联的 TKIP 站点被强制去认证，并阻止其重新关联，持续时间最长可达 90 秒；而本应在窗口内触发反制措施的 MIC 失败事件却被静默丢弃，导致密钥恢复尝试无法被检测到。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1564 · Hide Artifacts

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenBSD OpenBSD < 1ee99dfcc4ddc87afc6395d5d3094e9d2314fb5a affected
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I. Basic Information for CVE-2026-56101

Vulnerability Information
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Vulnerability Title
OpenBSD ieee80211_crypto_tkip.c TKIP MIC Countermeasure Logic Inversion DoS
Source: CVE Program / CVE List V5
Vulnerability Description
OpenBSD before commit 1ee99df contains an inverted comparison vulnerability in the ieee80211_michael_mic_failure() function within sys/net80211/ieee80211_crypto_tkip.c that allows unauthenticated attackers within RF range to trigger denial of service by sending two malformed TKIP frames separated by more than 60 seconds. Attackers can exploit the reversed TKIP MIC failure countermeasure window check to deauthenticate all associated TKIP stations and block reassociation for up to 90 seconds, while within-window MIC failures that should engage countermeasures are silently discarded, leaving key-recovery attempts undetected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的比较
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenBSD OpenBSD 0 ~ 1ee99dfcc4ddc87afc6395d5d3094e9d2314fb5a -

II. Public POCs for CVE-2026-56101

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III. Intelligence Information for CVE-2026-56101

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Patches & Fixes for CVE-2026-56101 (1)

Vendor Advisories for CVE-2026-56101 (2)

IV. Related Vulnerabilities

Same product: OpenBSD
Same vendor: OpenBSD
Same weakness: CWE-697

V. Comments for CVE-2026-56101

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