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CVE-2025-39891

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: Initialize the chan_stats array to zero The adapter->chan_stats[] array is initialized in mwifiex_init_channel_s…

Published Oct 1, 2025EPSS 0.16%

Overview

CVE-2025-39891 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

wifi: mwifiex: Initialize the chan_stats array to zero

The adapter->chan_stats[] array is initialized in

mwifiex_init_channel_scan_gap() with vmalloc(), which doesn't zero out

memory. The array is filled in mwifiex_update_chan_statistics()

and then the user can query the data in mwifiex_cfg80211_dump_survey().

There are two potential issues here. What if the user calls

mwifiex_cfg80211_dump_survey() before the data has been filled in.

Also the mwifiex_update_chan_statistics() function doesn't necessarily

initialize the whole array. Since the array was not initialized at

the start that could result in an information leak.

Also this array is pretty small. It's a maximum of 900 bytes so it's

more appropriate to use kcalloc() instead vmalloc().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/05daef0442d28350a1a0d6d0e2cab4a7a91df475Refgit.kernel.org/stable/c/06616410a3e5e6cd1de5b7cbc668f1a7edeedad9Refgit.kernel.org/stable/c/0e20450829ca3c1dbc2db536391537c57a40fe0bRefgit.kernel.org/stable/c/32c124c9c03aa755cbaf60ef7f76afd918d47659Refgit.kernel.org/stable/c/5285b7009dc1e09d5bb9e05fae82e1a807882dbcRefgit.kernel.org/stable/c/9df29aa5637d94d24f7c5f054ef4feaa7b766111Refgit.kernel.org/stable/c/9eb0118b3470b4d2e4e3bbb1fc088b30c0285d65Refgit.kernel.org/stable/c/acdf26a912190fc6746e2a890d7d0338190527b4Reflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39891?

CVE-2025-39891 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-39891?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39891?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-39891?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39891 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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