What’s Vulnerable › Vulnerabilities

CVE-2025-39957: wifi: mac80211: increase scan_ies_len for S1G

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-09 · updated 2026-10-19

Description

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.

Affected products

• Linux kernel: from 6.4 before 6.6.108; from 6.7 before 6.12.49; from 6.13 before 6.16.9; 6.17-rc1, 6.17-rc2, 6.17-rc3, 6.17-rc4 — fixed in 6.12.49, 6.16.9, 6.6.108

How to fix

Upgrade to a fixed version: Linux kernel 6.12.49, 6.16.9, 6.6.108. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0dbad5f5549e54ac269cc04ce89f212892a98cab
• https://git.kernel.org/stable/c/32adb020b0c32939da1322dcc87fc0ae2bc935d1
• https://git.kernel.org/stable/c/7e2f3213e85eba00acb4cfe6d71647892d63c3a1
• https://git.kernel.org/stable/c/93e063f15e17acb8cd6ac90c8f0802c2624e1a74

Get alerted when CVE-2025-39957 or the next vulnerability affects your stack