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CVE-2024-27022 is a race condition in the Linux kernel's initialization of file-backed virtual memory areas during fork. The dup_mmap path exposes a child VMA through the mapping's i_mmap interval tree before initialization completes. Meanwhile, hugetlb_dup_vma_private() and hugetlb_vm_op_open() clear or allocate the VMA lock outside i_mmap_rwsem protection. Concurrent hugetlbfs hole-punching can therefore encounter a VMA whose lock changes between lock acquisition and release. The issue was observed as a kernel warning and is fixed by delaying publication of file-backed VMAs until they are fully initialized.
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A Linux kernel race condition exposes a child virtual memory area (VMA) before initialization is complete during fork, allowing concurrent hugetlbfs operations to encounter inconsistent VMA locking state. The fix delays linking the file VMA until it is fully initialized. The reference assigns CVSS v3 severity High (7.8), with local access and low privileges required and potential high confidentiality, integrity, and availability impacts.
Linux kernel fork-path flaw involving linking a file VMA before it is fully initialized.
Linux kernel fork/VMA initialization flaw addressed by deferring file-VMA linking.
A resolved Linux kernel vulnerability in fork-related virtual memory area (VMA) handling, addressed by deferring linkage of a file VMA until initialization is complete.
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Cross-references every affected SKU, including bundled OEM variants.
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