CVE-2025-21898 Information

Description

In the Linux kernel the following vulnerability has been resolved:

ftrace: Avoid potential division by zero in function_stat_show()

Check whether denominator expression x (x - 1) 1000 mod 2^32 2^64 produce zero and skip stddev computation in that case.

For now don’t care about rec->counter rec->counter overflow because rec->time rec->time overflow will likely happen earlier.

Reference

https://git.kernel.org/stable/c/3d738b53ed6cddb68e68c9874520a4bf846163b5 https://git.kernel.org/stable/c/5b3d32f607f0478b414b16516cf27f9170cf66c8 https://git.kernel.org/stable/c/746cc474a95473591853927b3a9792a2d671155b https://git.kernel.org/stable/c/992775227843c9376773784b8b362add44592ad7 https://git.kernel.org/stable/c/9cdac46fa7e854e587eb5f393fe491b6d7a9bdf6 https://git.kernel.org/stable/c/a1a7eb89ca0b89dc1c326eeee2596f263291aca3 https://git.kernel.org/stable/c/ca381f60a3bb7cfaa618d73ca411610bd7fc3149 https://git.kernel.org/stable/c/f58a3f8e284d0bdf94164a8e61cd4e70d337a1a3