CVE-2026-64180

Summary

In the Linux kernel, the following vulnerability has been resolved:

mm/memory_hotplug: fix memory block reference leak on remove

Patch series "mm: Fix memory block leaks and locking", v2.

This series fixes two memory block device reference leaks and one locking issue around the per-memory_block hwpoison counter.

This patch (of 2):

remove_memory_blocks_and_altmaps() looks up each memory block with find_memory_block(), which acquires a reference to the memory block device.

That reference is never dropped on this path, resulting in a leaked device reference when removing memory blocks and their altmaps. Drop the reference after retrieving mem->altmap and clearing mem->altmap, before removing the memory block device.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/b8ab30c79fc00147125b9c39f928561d9dd13d06
• https://git.kernel.org/stable/c/09ce923071e7852ece60d7368e05249bf32c7967
• https://git.kernel.org/stable/c/df64c0d21c3f85f844b2f656333e43d97e6ffa74
• https://git.kernel.org/stable/c/93866f55f7e292fe3d47d36c9efe5ee10213a06b

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