CVE Catalog

CVE-2026-72212

Low risk· EPSS 10%
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.20%

10th percentile - higher than 10% of all known CVEs

Summary

In the Linux kernel's memory_hotplug module, there is a bug where NULL is passed instead of altmap in the error path. When arch_add_memory() succeeds and create_memory_block_devices() fails, arch_remove_memory() is called with NULL altmap, leading to memory corruption.

Risk Assessment

Memory corruption can lead to machine checks, system crashes, or potential data integrity compromise.

Recommendation

Install a kernel patch that passes params.altmap to arch_remove_memory() in the error path.

Other vulnerabilities in Linux kernel

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Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS