kernel: mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory

A use-after-free memory bug exists in the linux kernel, such that unpoisonmemory tries to check the PGHWPoison flags of an uninitialized page. So VMBUGONPAGEPagePoisonedpage is triggered, leading to damage to the system availability and integrity...

hwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio

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PT-2024-32203

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.10.9 Description The issue arises when PG hwpoison pages are freed and treated differently in free pages prepare, leading to isolation instead of release. Page allocation tag counters are decremented, consideri...