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CVE-2025-37958 is a race-condition vulnerability in the Linux kernel's huge-memory management subsystem. During transparent huge page (THP) migration, concurrent access to a page middle directory (PMD) migration entry during a deferred split scan can cause split_huge_pmd_locked to dereference an invalid address, triggering a kernel page fault. The correction detects PMD migration entries and returns early because a locked migration entry cannot represent the target folio. The issue was discovered by syzkaller and confirmed in upstream Linux.
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A Linux kernel memory-management flaw involving an invalid PMD migration-entry dereference can cause a kernel page fault and local denial of service. The reported CVSS v3 score is 5.5, with low privileges required and high availability impact. The bug was found by syzkaller and confirmed on the upstream kernel. The advisory recommends updating Echo linux packages to version 6.1.147-1 or later.
A Linux kernel huge-memory management flaw caused by dereferencing an invalid PMD migration entry, affecting Rocky Linux 9 kernel packages covered by CIQ advisory crlsa-2025_11861.
A Linux kernel huge-memory management flaw caused by dereferencing an invalid PMD migration entry.
Linux kernel huge-memory management flaw caused by dereferencing an invalid PMD migration entry.
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Cross-references every affected SKU, including bundled OEM variants.
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