CVE-2026-89574Public exploit

Kernel crash via unchecked dm-array entry count

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds read in Linux kernel dm-array handling allows local users with CAP_SYS_ADMIN to crash the kernel during cache activation. array_block_check() accepts unchecked nr_entries, max_entries, and value_size fields, so dm_array_cursor_next() drives element_at() beyond the dm-bufio block. Loading crafted device-mapper metadata and activating the cache requires CAP_SYS_ADMIN; the resulting out-of-bounds read can fault or crash the kernel.

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 read in Linux kernel dm-array handling allows local users with CAP_SYS_ADMIN to crash the kernel during cache activation. array_block_check() accepts unchecked nr_entries, max_entries, and value_size fields, so dm_array_cursor_next() drives element_at() beyond the dm-bufio block. Loading crafted device-mapper metadata and activating the cache requires CAP_SYS_ADMIN; the resulting out-of-bounds read can fault or crash the kernel.

The record

CVE
CVE-2026-89574
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

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=3.9
  2. Affected versionversion=6513c29f44f2cc970c0e9fecfe5a6526c3e73025 <2965787723084835b18dfe993cd450ebf5bd4540
  3. Affected versionversion=6513c29f44f2cc970c0e9fecfe5a6526c3e73025 <67adda7ed5da3e3b64f5b9021a02c21fb374fd9c
  4. Affected versionversion=6513c29f44f2cc970c0e9fecfe5a6526c3e73025 <9808ddffb4bc659352df3020cd84d9d864820ee5
  5. Affected versionversion=6513c29f44f2cc970c0e9fecfe5a6526c3e73025 <b33f76d33aaeacf3baf3370d8d64985169b36600

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3.9; version=6513c29f44f2cc970c0e9fecfe5a6526c3e73025 <2965787723084835b18dfe993cd450ebf5bd4540; version=6513c29f44f2cc970c0e9fecfe5a6526c3e73025 <67adda7ed5da3e3b64f5b9021a02c21fb374fd9c; version=6513c29f44f2cc970c0e9fecfe5a6526c3e73025 <9808ddffb4bc659352df3020cd84d9d864820ee5; version=6513c29f44f2cc970c0e9fecfe5a6526c3e73025 <b33f76d33aaeacf3baf3370d8d64985169b36600

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

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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