CVE-2025-39883

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.10.0-rc1-00195-g148743902568

Description The Linux kernel contains a flaw in the memory management subsystem related to handling poisoned memory pages. Specifically, the unpoison memory function incorrectly checks page flags, triggering a kernel panic when attempting to unpoison memory. This occurs when pfn to online page() returns NULL, indicating an offline memory block. The issue is reproducible by taking memory offline, obtaining its page frame number (PFN), and then attempting to unpoison it via the /sys/kernel/debug/hwpoison/unpoison-pfn interface. The root cause is that VM BUG ON PAGE(PagePoisoned(page)) is triggered on an uninitialized page.

Recommendations Update to a version newer than 6.10.0-rc1-00195-g148743902568.