CVE-2026-89559

Kernel memory corruption via wrapped namespace index

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds write in affected Linux kernels allows attackers to corrupt kernel memory via a crafted libnvdimm namespace index. __nd_label_validate() multiplies the untrusted 32-bit nslot value by an unsigned runtime label size in 32-bit arithmetic, so the bound wraps and accepts an oversized slot count. The field must arrive from DIMM label media or ND_CMD_SET_CONFIG_DATA; nd_label_data_init() then uses it as a memset loop count beyond the config_size buffer.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in affected Linux kernels allows attackers to corrupt kernel memory via a crafted libnvdimm namespace index. __nd_label_validate() multiplies the untrusted 32-bit nslot value by an unsigned runtime label size in 32-bit arithmetic, so the bound wraps and accepts an oversized slot count. The field must arrive from DIMM label media or ND_CMD_SET_CONFIG_DATA; nd_label_data_init() then uses it as a memset loop count beyond the config_size buffer.

The record

CVE
CVE-2026-89559
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=4.13
  2. Affected versionversion=564e871aa66f548a947b23808d3140f326381f0c <037770686126155eafc44501312989e2837b9659
  3. Affected versionversion=564e871aa66f548a947b23808d3140f326381f0c <09e649117c54b7e1c004f22eaa19efbadd9ac856
  4. Affected versionversion=564e871aa66f548a947b23808d3140f326381f0c <69a734359639fca16a0dd73ab17a34943e76c68b
  5. Affected versionversion=564e871aa66f548a947b23808d3140f326381f0c <e057efcc9c71d90099d9ee00bed0748d0e9fd586

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=564e871aa66f548a947b23808d3140f326381f0c <037770686126155eafc44501312989e2837b9659; version=564e871aa66f548a947b23808d3140f326381f0c <09e649117c54b7e1c004f22eaa19efbadd9ac856; version=564e871aa66f548a947b23808d3140f326381f0c <69a734359639fca16a0dd73ab17a34943e76c68b; version=564e871aa66f548a947b23808d3140f326381f0c <e057efcc9c71d90099d9ee00bed0748d0e9fd586

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

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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)
VectorUnavailable
PrivilegesUnavailable
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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