Bug 2402700 (CVE-2025-39957)

Summary: CVE-2025-39957 kernel: wifi: mac80211: increase scan_ies_len for S1G
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel Wi-Fi stack (mac80211) in the way S1G capability length is accounted during scan preparation. Missing S1G bytes caused a buffer length validation failure and warnings, blocking hardware scanning. A local user could use this flaw to prevent wireless scanning on the system, resulting in a denial of service for scan operations.
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Description OSIDB Bzimport 2025-10-09 10:01:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: increase scan_ies_len for S1G

Currently the S1G capability element is not taken into account
for the scan_ies_len, which leads to a buffer length validation
failure in ieee80211_prep_hw_scan() and subsequent WARN in
__ieee80211_start_scan(). This prevents hw scanning from functioning.
To fix ensure we accommodate for the S1G capability length.
Comment 1 Jon Moroney 2025-10-09 16:28:28 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100943-CVE-2025-39957-33c1@gregkh/T