CVE-2025-40218 - mm/damon/vaddr: do not repeat pte_offset_map_lock() until success

CVE-2025-40218 - mm/damon/vaddr: do not repeat pte_offset_map_lock() until success

https://cvefeed.io/rssfeed/latest.atom / Thu, 12/04/2025 - 16:51
CVE ID : CVE-2025-40218
Published : Dec. 4, 2025, 2:50 p.m. | 21 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: mm/damon/vaddr: do not repeat pte_offset_map_lock() until success DAMON's virtual address space operation set implementation (vaddr) calls pte_offset_map_lock() inside the page table walk callback function. This is for reading and writing page table accessed bits. If pte_offset_map_lock() fails, it retries by returning the page table walk callback function with ACTION_AGAIN. pte_offset_map_lock() can continuously fail if the target is a pmd migration entry, though. Hence it could cause an infinite page table walk if the migration cannot be done until the page table walk is finished. This indeed caused a soft lockup when CPU hotplugging and DAMON were running in parallel. Avoid the infinite loop by simply not retrying the page table walk. DAMON is promising only a best-effort accuracy, so missing access to such pages is no problem.
Severity: 0.0 | NA
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