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Vulnerability record · CVE-2025-39891 · published 1 October 2025

CVE-2025-39891: Linux kernel vulnerability

Linux · Linux Kernel

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().

7.1 CVSS 3.1 High EPSS 0.16% · top 95.1%
7.1CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

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().

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/05daef0442d28350a1a0d6d0e2cab4a7a91df475 Patch
https://git.kernel.org/stable/c/06616410a3e5e6cd1de5b7cbc668f1a7edeedad9 Patch
https://git.kernel.org/stable/c/0e20450829ca3c1dbc2db536391537c57a40fe0b Patch
https://git.kernel.org/stable/c/32c124c9c03aa755cbaf60ef7f76afd918d47659 Patch
https://git.kernel.org/stable/c/5285b7009dc1e09d5bb9e05fae82e1a807882dbc Patch
https://git.kernel.org/stable/c/9df29aa5637d94d24f7c5f054ef4feaa7b766111 Patch
https://git.kernel.org/stable/c/9eb0118b3470b4d2e4e3bbb1fc088b30c0285d65 Patch
https://git.kernel.org/stable/c/acdf26a912190fc6746e2a890d7d0338190527b4 Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-39891), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.