Linux Kernel: mm memory block ref leak on remove
CVE-2026-64180 Published on July 19, 2026
mm/memory_hotplug: fix memory block reference leak on remove
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.
Products Associated with CVE-2026-64180
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Affected Versions
Linux:- Version 6b8f0798b85aa529011570369db985a788f3003f and below b8ab30c79fc00147125b9c39f928561d9dd13d06 is affected.
- Version 6b8f0798b85aa529011570369db985a788f3003f and below 09ce923071e7852ece60d7368e05249bf32c7967 is affected.
- Version 6b8f0798b85aa529011570369db985a788f3003f and below df64c0d21c3f85f844b2f656333e43d97e6ffa74 is affected.
- Version 6b8f0798b85aa529011570369db985a788f3003f and below 93866f55f7e292fe3d47d36c9efe5ee10213a06b is affected.
- Version 6.8 is affected.
- Before 6.8 is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.