Inconsistency in zswap Management in Linux Kernel Affects System Performance

CVE-2025-21860

Summary

A vulnerability has been identified in the zswap management of the Linux kernel, where failure in zswap_store_page() can lead to inconsistencies within the zswap entries. Under certain conditions, such as system stress testing, this inconsistency may trigger warnings related to memory management. Specifically, when an attempt to zswap an entire folio fails, the operation is rolled back, which may lead to scenarios where zswap entries are uncharged inaccurately. This can compromise the integrity of memory management, affecting overall system performance. The issue has been addressed by modifying the handling of zswap entries to ensure consistency, thus eliminating the corresponding warnings during operation.

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