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CVE-2024-42241 is a Linux kernel memory-management vulnerability in the shared-memory (shmem) page cache. PMD-sized page-cache entries can exceed the size supported by xarray's multi-index representation. For example, ARM64 systems with 64 KB base pages can produce unsupported 512 MB entries. Splitting such an entry triggers errors and a kernel warning in xas_split_alloc. The observed execution path includes shared-memory range removal and fallocate handling. The limitation arose with the introduction of multi-index page-cache entries. The fix disables PMD-sized shmem page caching when HPAGE_PMD_ORDER exceeds MAX_PAGECACHE_ORDER.
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A Linux kernel shared-memory page-cache flaw causes errors when unsupported PMD-sized xarray entries are split, such as with a 512 MB page cache on ARM64 using 64 KB base pages. The fix disables PMD-sized page cache when HPAGE_PMD_ORDER exceeds MAX_PAGECACHE_ORDER. The advisory rates the vulnerability Medium, with CVSS v3 5.5, indicating local exploitation requiring low privileges and potentially high availability impact, without confidentiality or integrity impact.
Linux kernel shared-memory PMD-sized page-cache handling issue.
A Linux kernel shared-memory (mm/shmem) issue addressed by disabling PMD-sized page cache when necessary.
Linux kernel shared-memory page-cache handling issue involving PMD-sized page cache.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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