CVE-2025-37834 is a vulnerability in the Linux kernel's memory management subsystem where the kernel attempts to reclaim hardware-poisoned memory pages (hwpoison folios) improperly. This can lead to a kernel BUG and system crash (Oops) due to incorrect handling of dirty swapcache pages that are hardware poisoned. The issue arises when the kernel tries to reclaim such pages, which are not properly unmapped and remain in the least recently used (LRU) list indefinitely, causing a failure in the reclaim process.