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🛡️ CVE-2025-39891 — debian-linux

🟠 CVSS 7.1 — High ✅ No Known Exploit NVD
7.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

wifi: mwifiex: Initialize the chan_stats array to zero

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().

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability high.

Affected software

CVE-2025-39891 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.13.0 up to 6.16.6)
  • linux-kernel

Timeline and source

Published on 1 October 2025 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org
lists.debian.org

CVE-2025-39891 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.1
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-10-01
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.13.0 6.16.6
linux-kernel — —

References

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.