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CVE-2024-35877 is an x86 Linux kernel memory-management flaw in VM_PAT handling for copy-on-write mappings. During write faults, PTEs in a COW mapping can be replaced with anonymous folios. The PAT tracking paths used follow_phys() to recover the mapped PFN and cache mode from those PTEs; this can return anonymous-folio information, fail for swap or non-swap entries, or otherwise yield an incorrect PFN range. Consequently, untrack_pfn() and track_pfn_copy() can fail to correctly release PAT memtype tracking through free_pfn_range(). The fix makes follow_phys() reject anonymous folios, uses the PFN retained in the VMA offset for applicable COW mappings, correctly handles untracking, and rejects fork-time PFN tracking when the cache mode cannot be safely recovered.
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A flaw in Linux kernel x86 memory-management handling of VM_PAT in copy-on-write mappings.
A Linux kernel x86 memory-management vulnerability involving incorrect VM_PAT handling in copy-on-write (COW) mappings. The issue was resolved upstream and fixed in multiple Linux kernel versions and Red Hat Enterprise Linux advisories.
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