CVE-2026-72212 mm/memory_hotplug: fix incorrect altmap passing in error path

In the Linux kernel, the following vulnerability has been resolved: mm/memoryhotplug: fix incorrect altmap passing in error path In createaltmapsandmemoryblocks, when archaddmemory succeeds with memmaponmemory enabled, the vmemmap pages are allocated from params.altmap. If creatememoryblockdevice...

drivers/base/memory: set mem->altmap after successful device registration

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