CVE-2026-53043Network attack vector

Kernel-memory disclosure or crash via unchecked region count

Published Jun 24, 2026 · Updated Jun 24, 2026

Out-of-bounds read in Linux Kernel OCFS2 DLM allows remote attackers to disclose kernel memory or crash a cluster node. The dlm_match_regions() loops trust qr_numregions from a DLM_QUERY_REGION message as the bound for the fixed 32-entry qr_regions buffer. Reachability requires active OCFS2 cluster infrastructure and delivery of a crafted cluster message; the bounded effects are kernel-memory disclosure or node interruption.

CVSS severity9.1
Critical
EPSS probability0.51%
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 OCFS2 DLM allows remote attackers to disclose kernel memory or crash a cluster node. The dlm_match_regions() loops trust qr_numregions from a DLM_QUERY_REGION message as the bound for the fixed 32-entry qr_regions buffer. Reachability requires active OCFS2 cluster infrastructure and delivery of a crafted cluster message; the bounded effects are kernel-memory disclosure or node interruption.

The record

CVE
CVE-2026-53043
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.6.37
  2. Affected versionversion=ea2034416b54700e30371f2ad6517cbb94674083 <1f8b91275912cd428289c1fb424bebd7ff5302bd
  3. Affected versionversion=ea2034416b54700e30371f2ad6517cbb94674083 <3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21
  4. Affected versionversion=ea2034416b54700e30371f2ad6517cbb94674083 <3f474c33ebc2e2ca3fcb587d7de4375348f13373
  5. Affected versionversion=ea2034416b54700e30371f2ad6517cbb94674083 <6c6e8fc3c007319981647b410c29bb5775048551
  6. Affected versionversion=ea2034416b54700e30371f2ad6517cbb94674083 <7ab3fbb01bc6d79091bc375e5235d360cd9b78be
  7. Affected versionversion=ea2034416b54700e30371f2ad6517cbb94674083 <d3d5efade0c79dac1cac98c0cb1115432f804439
  8. Affected versionversion=ea2034416b54700e30371f2ad6517cbb94674083 <f37de46149db49abd2b24f4f0c5a88cf4dfb5f47
  9. Affected versionversion=ea2034416b54700e30371f2ad6517cbb94674083 <f69551139caf6d24242a0ad049ee46b264e3aee0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.37; version=ea2034416b54700e30371f2ad6517cbb94674083 <1f8b91275912cd428289c1fb424bebd7ff5302bd; version=ea2034416b54700e30371f2ad6517cbb94674083 <3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21; version=ea2034416b54700e30371f2ad6517cbb94674083 <3f474c33ebc2e2ca3fcb587d7de4375348f13373; version=ea2034416b54700e30371f2ad6517cbb94674083 <6c6e8fc3c007319981647b410c29bb5775048551; version=ea2034416b54700e30371f2ad6517cbb94674083 <7ab3fbb01bc6d79091bc375e5235d360cd9b78be; version=ea2034416b54700e30371f2ad6517cbb94674083 <d3d5efade0c79dac1cac98c0cb1115432f804439; version=ea2034416b54700e30371f2ad6517cbb94674083 <f37de46149db49abd2b24f4f0c5a88cf4dfb5f47; version=ea2034416b54700e30371f2ad6517cbb94674083 <f69551139caf6d24242a0ad049ee46b264e3aee0

Published CVSS scores

9.1kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

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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