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CVE-2026-53309

ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison

No known exploitation. EPSS puts it in the 33rd percentile. Fixed versions are out.

CVSS 3.19.8CriticalEPSS percentile33rd0.4% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix1 product4 fixed builds listed below

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • LinuxAffected: ≥ ea2034416b54700e30371f2ad6517cbb94674083, < 760ab35040aca8399021fdb9ff1db1089feb7194Upgrade to: 760ab35040aca8399021fdb9ff1db1089feb7194Affected: ≥ ea2034416b54700e30371f2ad6517cbb94674083, < c60a2710b73838d250cda57344c049b89abc5d52Upgrade to: c60a2710b73838d250cda57344c049b89abc5d52Affected: ≥ ea2034416b54700e30371f2ad6517cbb94674083, < 2a0673836f019e7c032acbf48d022d5ccf02a845Upgrade to: 2a0673836f019e7c032acbf48d022d5ccf02a845Affected: ≥ ea2034416b54700e30371f2ad6517cbb94674083, < 819d8ebad3200a53de99bd7e297bc428e41ced54Upgrade to: 819d8ebad3200a53de99bd7e297bc428e41ced54 + 4 more branchesStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison The local-vs-remote region comparison loop uses '<=' instead of '<', causing it to read one entry past the valid range of qr_regions. The other loops in the same function correctly use '<'. Fix the loop condition to use '<' for consistency and correctness.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS33rd
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.4% chance of exploitation activity in the next 30 days, which ranks it in the 33rd percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

6 events over 19 days, from the signal feeds we watch.

  1. OpenVAS check added
  2. Patch availablerecord updated
  3. Record updated
  4. Publishedweakness classified

Affected products

And 1 more affected product. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Scored 9.8 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

Sources

References in the record

And 5 more references. See all after sign-in

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