wifi: cfg80211: advance loop vars in cfg80211_merge_profile()

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Summary

CVECVE-2026-64174
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:59 UTC
Updated2026-07-19 16:17:59 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fe806e4992c9047affd263bcc13b2c047029a726 5817e1e5205498a5df66eba2b34e817f4210fd0f git Not specified
CNA Linux Linux affected fe806e4992c9047affd263bcc13b2c047029a726 cedbb608494ba1e7a5c6c56b7f1d3fd470094f28 git Not specified
CNA Linux Linux affected fe806e4992c9047affd263bcc13b2c047029a726 c0bc4c8bd556cbe036a5b9ed333c0aab9aadfcb8 git Not specified
CNA Linux Linux affected fe806e4992c9047affd263bcc13b2c047029a726 1ced0f5a851f9cae274545a42a06c459b7fd8881 git Not specified
CNA Linux Linux affected fe806e4992c9047affd263bcc13b2c047029a726 67915715fd3874057457363c87c63e18829527df git Not specified
CNA Linux Linux affected fe806e4992c9047affd263bcc13b2c047029a726 6cfae4914439878b8acb35c7e3b40096eeb2ad9c git Not specified
CNA Linux Linux affected fe806e4992c9047affd263bcc13b2c047029a726 1343a480f84b80c1249133a90ef87f8751d65cbb git Not specified
CNA Linux Linux affected fe806e4992c9047affd263bcc13b2c047029a726 7666dbb1bacc4ba522b96740cba7283d243d16e1 git Not specified
CNA Linux Linux affected 5.2 Not specified
CNA Linux Linux unaffected 5.2 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/67915715fd3874057457363c87c63e18829527df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1343a480f84b80c1249133a90ef87f8751d65cbb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7666dbb1bacc4ba522b96740cba7283d243d16e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cedbb608494ba1e7a5c6c56b7f1d3fd470094f28 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1ced0f5a851f9cae274545a42a06c459b7fd8881 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c0bc4c8bd556cbe036a5b9ed333c0aab9aadfcb8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6cfae4914439878b8acb35c7e3b40096eeb2ad9c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5817e1e5205498a5df66eba2b34e817f4210fd0f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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