What is CVE-2025-39957?

CVE-2025-39957 is a high-severity vulnerability in Linux. CVSS score: 7.1/10. Published 2025-10-09.

How severe is CVE-2025-39957?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Linux

CVE-2025-39957

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.

EPSS: 0.001 (4.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Affected products

Linux — versions 0333a81bc83431d7f90391d38aa09e856c5e5b25, 6.4, 0
Linux Linux_kernel — versions 6.17

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2025-39957?: CVE-2025-39957 is a high-severity vulnerability in Linux. CVSS score: 7.1/10. Published 2025-10-09.
How severe is CVE-2025-39957?: High severity. CVSS v3 base score is 7.1 out of 10.