CVE-2025-21745

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().

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-25)

Published

2025-02-27

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/2ce09aabe009453d641a2ceb79e6461a2d4f3876
• https://git.kernel.org/stable/c/38287f779b34dfe959b4b681e909f2d3d52b88be
• https://git.kernel.org/stable/c/431b6ef2714be4d5babb802114987541a88b43b0
• https://git.kernel.org/stable/c/67c7f213e052b1aa6caba4a7e25e303bc6997126
• https://git.kernel.org/stable/c/993121481b5a87829f1e8163f47158b72679f309

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