mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93172
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:12 UTC
Updated2026-09-17 17:18:12 UTC
DescriptionIn 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

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.101550000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 75ef7184053989118d3814c558a9af62e7376a58 4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc git Not specified
CNA Linux Linux affected 75ef7184053989118d3814c558a9af62e7376a58 bc3b5e6519b8df22d622a03eab6772784da97db4 git Not specified
CNA Linux Linux affected 75ef7184053989118d3814c558a9af62e7376a58 1017fe1c7f48e511c5a680e3057005daaff2f3a2 git Not specified
CNA Linux Linux affected 75ef7184053989118d3814c558a9af62e7376a58 2ebce860bdd7ae5e13002811bc9bbbf33fcfc221 git Not specified
CNA Linux Linux affected 4.8 Not specified
CNA Linux Linux unaffected 4.8 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2ebce860bdd7ae5e13002811bc9bbbf33fcfc221 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1017fe1c7f48e511c5a680e3057005daaff2f3a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bc3b5e6519b8df22d622a03eab6772784da97db4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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