VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

CVE-2026-93172: Linux kernel · mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in bc3b5e6519b8df22d622a03eab6772784da97db4 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in bc3b5e6519b8df22d622a03eab6772784da97db4, 1017fe1c7f48e511c5a680e3057005daaff2f3a2, 4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c +2

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 75ef7184053989118d3814c558a9af62e7376a58, < bc3b5e6519b8df22d622a03eab6772784da97db4	Fixed in bc3b5e6519b8df22d622a03eab6772784da97db4
LinuxLinux	Affected ≥ 75ef7184053989118d3814c558a9af62e7376a58, < 1017fe1c7f48e511c5a680e3057005daaff2f3a2	Fixed in 1017fe1c7f48e511c5a680e3057005daaff2f3a2
LinuxLinux	Affected ≥ 75ef7184053989118d3814c558a9af62e7376a58, < 4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c	Fixed in 4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c
LinuxLinux	Affected ≥ 75ef7184053989118d3814c558a9af62e7376a58, < 4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc	Fixed in 4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc
LinuxLinux	Affected ≥ 75ef7184053989118d3814c558a9af62e7376a58, < 2ebce860bdd7ae5e13002811bc9bbbf33fcfc221	Fixed in 2ebce860bdd7ae5e13002811bc9bbbf33fcfc221
LinuxLinux	Affected =4.8	Fixed in–

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

References

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