CVE-2025-39891

Summary

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().

Affected Software

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

References

• https://git.kernel.org/stable/c/9eb0118b3470b4d2e4e3bbb1fc088b30c0285d65
• https://git.kernel.org/stable/c/05daef0442d28350a1a0d6d0e2cab4a7a91df475
• https://git.kernel.org/stable/c/acdf26a912190fc6746e2a890d7d0338190527b4
• https://git.kernel.org/stable/c/32c124c9c03aa755cbaf60ef7f76afd918d47659
• https://git.kernel.org/stable/c/9df29aa5637d94d24f7c5f054ef4feaa7b766111
• https://git.kernel.org/stable/c/06616410a3e5e6cd1de5b7cbc668f1a7edeedad9
• https://git.kernel.org/stable/c/5285b7009dc1e09d5bb9e05fae82e1a807882dbc
• https://git.kernel.org/stable/c/0e20450829ca3c1dbc2db536391537c57a40fe0b

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