CVE-2026-23244

Page-allocator warning via oversized NVMe allocation

Published Mar 18, 2026 · Updated Mar 18, 2026

Improper memory allocation in affected Linux Kernel branches starting at 6.5 allows local users to trigger a page-allocator warning via an NVMe ioctl. In nvme_pr_read_keys(), a user-controlled num_keys value drives struct_size() and kzalloc() to request up to 4 MB of physically contiguous memory, exceeding MAX_PAGE_ORDER. Access to an NVMe block device and its persistent-reservation read-keys ioctl is required; published evidence demonstrates an allocator warning, not a crash or data compromise.

CVSS severity7.1
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper memory allocation in affected Linux Kernel branches starting at 6.5 allows local users to trigger a page-allocator warning via an NVMe ioctl. In nvme_pr_read_keys(), a user-controlled num_keys value drives struct_size() and kzalloc() to request up to 4 MB of physically contiguous memory, exceeding MAX_PAGE_ORDER. Access to an NVMe block device and its persistent-reservation read-keys ioctl is required; published evidence demonstrates an allocator warning, not a crash or data compromise.

The record

CVE
CVE-2026-23244
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5fd96a4e15de8442915a912233d800c56f49001d <15fb6d627484ee39ed73e202ef4720e1fa5c898e
  2. Affected versionversion=5fd96a4e15de8442915a912233d800c56f49001d <5a501379a010690ae9ae88bef62a1bae1aca32e6
  3. Affected versionversion=5fd96a4e15de8442915a912233d800c56f49001d <baef52d80093bd686e70b3cb7e0512a40ae76705
  4. Affected versionversion=5fd96a4e15de8442915a912233d800c56f49001d <c3320153769f05fd7fe9d840cb555dd3080ae424
  5. Affected versionversion=6.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5fd96a4e15de8442915a912233d800c56f49001d <15fb6d627484ee39ed73e202ef4720e1fa5c898e; version=5fd96a4e15de8442915a912233d800c56f49001d <5a501379a010690ae9ae88bef62a1bae1aca32e6; version=5fd96a4e15de8442915a912233d800c56f49001d <baef52d80093bd686e70b3cb7e0512a40ae76705; version=5fd96a4e15de8442915a912233d800c56f49001d <c3320153769f05fd7fe9d840cb555dd3080ae424; version=6.5

Published CVSS scores

7.1Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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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