CVE-2025-39891
wifi: mwifiex: Initialize the chan_stats array to zero
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().
INFO
Published Date :
Oct. 1, 2025, 8:15 a.m.
Last Modified :
Oct. 2, 2025, 7:12 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Use kcalloc() instead of vmalloc() to allocate and zero memory.
- Ensure all array elements are initialized before use.
- Update the mwifiex_init_channel_scan_gap function.
- Modify mwifiex_update_chan_statistics function.
Public PoC/Exploit Available at Github
CVE-2025-39891 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
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CVE-2025-39891.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-39891 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-39891
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
DSA and DLA for Debian last 14 days
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CVE-2025-39891 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-39891 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 01, 2025
Action Type Old Value New Value Added 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(). Added Reference https://git.kernel.org/stable/c/05daef0442d28350a1a0d6d0e2cab4a7a91df475 Added Reference https://git.kernel.org/stable/c/06616410a3e5e6cd1de5b7cbc668f1a7edeedad9 Added Reference https://git.kernel.org/stable/c/0e20450829ca3c1dbc2db536391537c57a40fe0b Added Reference https://git.kernel.org/stable/c/32c124c9c03aa755cbaf60ef7f76afd918d47659 Added Reference https://git.kernel.org/stable/c/5285b7009dc1e09d5bb9e05fae82e1a807882dbc Added Reference https://git.kernel.org/stable/c/9df29aa5637d94d24f7c5f054ef4feaa7b766111 Added Reference https://git.kernel.org/stable/c/9eb0118b3470b4d2e4e3bbb1fc088b30c0285d65 Added Reference https://git.kernel.org/stable/c/acdf26a912190fc6746e2a890d7d0338190527b4