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CVE-2026-72212: Linux

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    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: mm/memory_hotplug: fix incorrect altmap passing in error path In create_altmaps_and_memory_blocks(), when arch_add_memory() succeeds with memmap_on_memory enabled, the vmemmap pages are allocated from params.altmap. If create_memory_block_devices() subsequently fails, the error path calls arch_remove_memory() with a NULL altmap instead of params.altmap. This is a bug that could lead to memory corruption. Since altmap is NULL, vmemmap_free() falls back to freeing the vmemmap pages into the system buddy allocator via free_pages() instead of the altmap. arch_remove_memory() then immediately destroys the physical linear mapping for this memory. This injects unowned pages into the buddy allocator, causing machine checks or memory corruption if the system later attempts to allocate and use those freed pages. Fix this by passing params.altmap to arch_remove_memory() in the error path.

    Засегнати продукти

    • Linux Linux: 6b8f0798b85aa529011570369db985a788f3003f преди 3833e6abdbbfb59ec8203a84a84206cb7ffb41ac; 6b8f0798b85aa529011570369db985a788f3003f преди 722e6c54bde6391fb95f0357f555aca887c7b18c; 6b8f0798b85aa529011570369db985a788f3003f преди 2f9e3ec17c3d2093c664c00a027588a446c39894; 6b8f0798b85aa529011570369db985a788f3003f преди 2fac4afa0e2e68841334c78c1821e49f74fbc66a
    • Linux Linux: 6.8; преди 6.8; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

    История

    • 15 август 2026 Публикувано

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    Първоизточници

    CVE-2026-72212: Linux | freedomonline.bg