CVE-2025-21745 Information

Description

In the Linux kernel the following vulnerability has been resolved:

blk-cgroup: Fix class @block_class’s subsystem refcount leakage

blkcg_fill_root_iostats() iterates over @block_class’s devices by class_dev_iter_(init|next)() but does not end iterating with class_dev_iter_exit() so causes the class’s subsystem refcount leakage.

Fix by ending the iterating with class_dev_iter_exit().

Reference

https://git.kernel.org/stable/c/2ce09aabe009453d641a2ceb79e6461a2d4f3876 https://git.kernel.org/stable/c/431b6ef2714be4d5babb802114987541a88b43b0 https://git.kernel.org/stable/c/67c7f213e052b1aa6caba4a7e25e303bc6997126 https://git.kernel.org/stable/c/993121481b5a87829f1e8163f47158b72679f309 https://git.kernel.org/stable/c/d1248436cbef1f924c04255367ff4845ccd9025e