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().

Impact & exploitability

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

Affected products we track (2)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/05daef0442d28350a1a0d6d0e2cab4a7a91df475 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/05daef0442d28350a1a0d6d0e2cab4a7a91df475Patch
• https://git.kernel.org/stable/c/06616410a3e5e6cd1de5b7cbc668f1a7edeedad9Patch
• https://git.kernel.org/stable/c/0e20450829ca3c1dbc2db536391537c57a40fe0bPatch
• https://git.kernel.org/stable/c/32c124c9c03aa755cbaf60ef7f76afd918d47659Patch
• https://git.kernel.org/stable/c/5285b7009dc1e09d5bb9e05fae82e1a807882dbcPatch
• https://git.kernel.org/stable/c/9df29aa5637d94d24f7c5f054ef4feaa7b766111Patch
• https://git.kernel.org/stable/c/9eb0118b3470b4d2e4e3bbb1fc088b30c0285d65Patch
• https://git.kernel.org/stable/c/acdf26a912190fc6746e2a890d7d0338190527b4Patch