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CVE-2024-42243 affects Linux kernel file page-cache handling. MAX_PAGECACHE_ORDER can permit page-cache sizes that xarray cannot support, causing a WARN_ON() condition in xas_split_alloc() when an oversized entry is split. A reproducer demonstrated the warning on ARM64 with 64 KB base pages and 512 MB huge pages by populating a huge-page-backed shared-memory mapping and punching a hole in its backing file. The correction constrains MAX_PAGECACHE_ORDER to sizes supported by xarray; related patches avoid unsupported PMD-sized page caches in synchronous readahead and shared-memory handling.
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A Linux kernel page-cache sizing flaw allows page-cache orders unsupported by xarray, triggering a kernel warning during page-cache splitting. The reference rates it Medium, with CVSS v3 5.5 and a local, low-privilege attack vector affecting availability. It includes a reproducer but explicitly states that no known exploits are available. Google COS remediation is to update the affected lakitu-kernel packages to version 18613.0.3 or later.
A Linux kernel page-cache sizing flaw allows page-cache orders unsupported by xarray, triggering a kernel warning during page-cache splitting. The supplied reproducer demonstrates the issue on ARM64 using large pages. The advisory rates it CVSS v3 5.5, with local access, low privileges, and high availability impact; no confidentiality or integrity impact is indicated. Echo recommends updating the linux package and related packages to version 6.9.10-1 or later.
Linux kernel vulnerability covered by the security update.
Linux kernel filemap/XArray page-cache order handling issue.
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Cross-references every affected SKU, including bundled OEM variants.
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