CVE-2026-93172
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
How to fix
- Linux Linuxeb872b92e26c2576742d541e45f28b50af059b8b, 4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c, 4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc, bc3b5e6519b8df22d622a03eab6772784da97db4, 1017fe1c7f48e511c5a680e3057005daaff2f3a2, 2ebce860bdd7ae5e13002811bc9bbbf33fcfc221 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 75ef7184053989118d3814c558a9af62e7376a58 ≤ v < eb872b92e26c2576742d541e45f28b50af059b8b, 75ef7184053989118d3814c558a9af62e7376a58 ≤ v < 4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c, 75ef7184053989118d3814c558a9af62e7376a58 ≤ v < 4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc, 75ef7184053989118d3814c558a9af62e7376a58 ≤ v < bc3b5e6519b8df22d622a03eab6772784da97db4, 75ef7184053989118d3814c558a9af62e7376a58 ≤ v < 1017fe1c7f48e511c5a680e3057005daaff2f3a2, 75ef7184053989118d3814c558a9af62e7376a58 ≤ v < 2ebce860bdd7ae5e13002811bc9bbbf33fcfc221, 4.8 | eb872b92e26c2576742d541e45f28b50af059b8b, 4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c, 4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc, bc3b5e6519b8df22d622a03eab6772784da97db4, 1017fe1c7f48e511c5a680e3057005daaff2f3a2, 2ebce860bdd7ae5e13002811bc9bbbf33fcfc221 |
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