CVE-2025-39891

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().

More information : https://git.kernel.org/stable/c/05daef0442d28350a1a0d6d0e2cab4a7a91df475