CVE-2026-89966Public exploitHinoki check available

Kernel panic via NULL HugeTLB CMA nodemask

Published Sep 16, 2026 · Updated Sep 16, 2026

NULL pointer dereference in Linux 6.19 allows local users to crash the kernel through a crafted gigantic hugepage allocation. hugetlb_cma_alloc_frozen_folio dereferences a NULL nodemask propagated through the gigantic-page fallback in its node checks and iteration. Exploitation requires HugeTLB CMA on only some NUMA nodes, an unreserved gigantic page, and MPOL_PREFERRED_MANY; the resulting fault panics the host.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL pointer dereference in Linux 6.19 allows local users to crash the kernel through a crafted gigantic hugepage allocation. hugetlb_cma_alloc_frozen_folio dereferences a NULL nodemask propagated through the gigantic-page fallback in its node checks and iteration. Exploitation requires HugeTLB CMA on only some NUMA nodes, an unreserved gigantic page, and MPOL_PREFERRED_MANY; the resulting fault panics the host.

The record

CVE
CVE-2026-89966
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=6.19
  2. Affected versionversion=eb02f14c4a2bf4c242d91c4a5d7fb57c3c0ad1b1 <10f616ef06c5bd2d656a0eebaf73f9b09d150c24
  3. Affected versionversion=eb02f14c4a2bf4c242d91c4a5d7fb57c3c0ad1b1 <7b8a8ae4dd176a232e973017d2aa3c536a7275e2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.19; version=eb02f14c4a2bf4c242d91c4a5d7fb57c3c0ad1b1 <10f616ef06c5bd2d656a0eebaf73f9b09d150c24; version=eb02f14c4a2bf4c242d91c4a5d7fb57c3c0ad1b1 <7b8a8ae4dd176a232e973017d2aa3c536a7275e2

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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