CVE-2026-64174 is a vulnerability in Linux Kernel
Published on July 19, 2026
wifi: cfg80211: advance loop vars in cfg80211_merge_profile()
In the Linux kernel, the following vulnerability has been resolved:
wifi: cfg80211: advance loop vars in cfg80211_merge_profile()
cfg80211_merge_profile() reassembles a Multi-BSSID non-transmitted BSS
profile that has been split across multiple consecutive MBSSID elements.
Its while-loop calls
cfg80211_get_profile_continuation(ie, ielen, mbssid_elem, sub_elem)
but never advances mbssid_elem or sub_elem inside the body. Each
iteration therefore searches for a continuation that follows the same
fixed pair; the helper returns the same next_mbssid; and the same
next_sub bytes are memcpy()'d into merged_ie at a growing offset until
the buffer fills.
Advance both mbssid_elem and sub_elem to the just-consumed continuation
so the next call to cfg80211_get_profile_continuation() searches for a
further continuation beyond it (or returns NULL when none exists).
A specially-crafted malicious beacon can take advantage of this bug
to cause the kernel to spend an excessive amount of time in
cfg80211_merge_profile (up to as much as 2ms per beacon received),
which could theoretically be abused in some way.
Products Associated with CVE-2026-64174
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Affected Versions
Linux:- Version fe806e4992c9047affd263bcc13b2c047029a726 and below 5817e1e5205498a5df66eba2b34e817f4210fd0f is affected.
- Version fe806e4992c9047affd263bcc13b2c047029a726 and below cedbb608494ba1e7a5c6c56b7f1d3fd470094f28 is affected.
- Version fe806e4992c9047affd263bcc13b2c047029a726 and below c0bc4c8bd556cbe036a5b9ed333c0aab9aadfcb8 is affected.
- Version fe806e4992c9047affd263bcc13b2c047029a726 and below 1ced0f5a851f9cae274545a42a06c459b7fd8881 is affected.
- Version fe806e4992c9047affd263bcc13b2c047029a726 and below 67915715fd3874057457363c87c63e18829527df is affected.
- Version fe806e4992c9047affd263bcc13b2c047029a726 and below 6cfae4914439878b8acb35c7e3b40096eeb2ad9c is affected.
- Version fe806e4992c9047affd263bcc13b2c047029a726 and below 1343a480f84b80c1249133a90ef87f8751d65cbb is affected.
- Version fe806e4992c9047affd263bcc13b2c047029a726 and below 7666dbb1bacc4ba522b96740cba7283d243d16e1 is affected.
- Version 5.2 is affected.
- Before 5.2 is unaffected.
- Version 5.10.258, <= 5.10.* is unaffected.
- Version 5.15.209, <= 5.15.* is unaffected.
- Version 6.1.175, <= 6.1.* is unaffected.
- Version 6.6.142, <= 6.6.* is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.