CVE-2025-40218

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/0ccd91cf749536d41307a07e60ec14ab0dbf21f5
https://git.kernel.org/stable/c/677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf
https://git.kernel.org/stable/c/ac42320ec873bfe726141069cfdd90ee5bc4e885
https://git.kernel.org/stable/c/b93af2cc8e036754c0d9970d9ddc47f43cc94b9f

Configurations

No configuration.

History

No history.

Information

Published : 2025-12-04 15:15

Updated : 2026-06-17 09:21

NVD link : CVE-2025-40218

Mitre link : CVE-2025-40218

CVE.ORG link : CVE-2025-40218

JSON object : View

Products Affected

No product.

CWE

No CWE.

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