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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.

OpenBSD是加拿大OpenBSD基金会开源的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD 1ee99df之前版本存在处理逻辑错误漏洞，该漏洞源于sys/net80211/ieee80211_crypto_tkip.c文件中的ieee80211_michael_mic_failure()函数存在比较逻辑反转问题，可能导致射频范围内的未认证攻击者发送两个相隔超过60秒的畸形TKIP帧触发拒绝服务，使所有关联的TKIP站点解除认证并阻止重新关联最长90秒。

CVSS 5.3 · Medium EPSS 0.60% · P49

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
Vulnerability Title
OpenBSD 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBSD是加拿大OpenBSD基金会开源的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD 1ee99df之前版本存在处理逻辑错误漏洞，该漏洞源于sys/net80211/ieee80211_crypto_tkip.c文件中的ieee80211_michael_mic_failure()函数存在比较逻辑反转问题，可能导致射频范围内的未认证攻击者发送两个相隔超过60秒的畸形TKIP帧触发拒绝服务，使所有关联的TKIP站点解除认证并阻止重新关联最长90秒。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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