CVE-2026-93172

mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug

State: Published
Severity: Not scored
Published: Sep 17, 2026
Updated: Oct 30, 2026
Reserved: Sep 17, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug

We miss a failed allocation check for pgdat->per_cpu_nodestats, which results in a NULL deref when we offset into the per-cpu area.

Propagate -ENOMEM up the stack and leave per_cpu_nodestats pointing at boot_nodestats so a later online can retry the allocation.

hotadd_init_pgdat() returns NULL on failure, which __try_online_node() already maps to -ENOMEM.

On failure nothing needs to be unwound: - the node is never marked online - per_cpu_nodestats is left pointing at boot_nodestats - __add_memory_resource() cleans up pending memblock resources - later online attempts retry the per_cpu_nodestats allocation

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	75ef7184053989118d3814c558a9af62e7376a58 to before eb872b92e26c2576742d541e45f28b50af059b8bAffected 75ef7184053989118d3814c558a9af62e7376a58 to before 4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455cAffected 75ef7184053989118d3814c558a9af62e7376a58 to before 4cc5caef9a8d1894dfa31d84a0daa0ac1437dadcAffected 75ef7184053989118d3814c558a9af62e7376a58 to before bc3b5e6519b8df22d622a03eab6772784da97db4Affected 75ef7184053989118d3814c558a9af62e7376a58 to before 1017fe1c7f48e511c5a680e3057005daaff2f3a2Affected 75ef7184053989118d3814c558a9af62e7376a58 to before 2ebce860bdd7ae5e13002811bc9bbbf33fcfc221Affected
LinuxLinux	4.8Affected before 4.8Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

75ef7184053989118d3814c558a9af62e7376a58 to before eb872b92e26c2576742d541e45f28b50af059b8bAffected
75ef7184053989118d3814c558a9af62e7376a58 to before 4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455cAffected
75ef7184053989118d3814c558a9af62e7376a58 to before 4cc5caef9a8d1894dfa31d84a0daa0ac1437dadcAffected
75ef7184053989118d3814c558a9af62e7376a58 to before bc3b5e6519b8df22d622a03eab6772784da97db4Affected
75ef7184053989118d3814c558a9af62e7376a58 to before 1017fe1c7f48e511c5a680e3057005daaff2f3a2Affected
75ef7184053989118d3814c558a9af62e7376a58 to before 2ebce860bdd7ae5e13002811bc9bbbf33fcfc221Affected

LinuxLinux

4.8Affected
before 4.8Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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