mm/memory_hotplug: fix memory block reference leak on remove

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Summary

CVECVE-2026-64180
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:18:00 UTC
Updated2026-07-19 16:18:00 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6b8f0798b85aa529011570369db985a788f3003f b8ab30c79fc00147125b9c39f928561d9dd13d06 git Not specified
CNA Linux Linux affected 6b8f0798b85aa529011570369db985a788f3003f 09ce923071e7852ece60d7368e05249bf32c7967 git Not specified
CNA Linux Linux affected 6b8f0798b85aa529011570369db985a788f3003f df64c0d21c3f85f844b2f656333e43d97e6ffa74 git Not specified
CNA Linux Linux affected 6b8f0798b85aa529011570369db985a788f3003f 93866f55f7e292fe3d47d36c9efe5ee10213a06b git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/09ce923071e7852ece60d7368e05249bf32c7967 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df64c0d21c3f85f844b2f656333e43d97e6ffa74 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b8ab30c79fc00147125b9c39f928561d9dd13d06 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/93866f55f7e292fe3d47d36c9efe5ee10213a06b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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