CVE-2026-53309

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-26. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
—
EPSS
33.0%
KEV
Not listed

Published

June 26, 2026

Last Modified

July 6, 2026

Advisory Details (8)

Auto-updated Jul 20, 2026
No patch confirmed yet.
generic

ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d5403ae28085761d58b555645bc7d5feadb10073
generic

ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c60a2710b73838d250cda57344c049b89abc5d52
generic

ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/819d8ebad3200a53de99bd7e297bc428e41ced54
generic

ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/760ab35040aca8399021fdb9ff1db1089feb7194
generic

ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/426cd8eedac89b86148d4478990eeef16e8a2520
generic

ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2a0673836f019e7c032acbf48d022d5ccf02a845
generic

ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1fb7f356547d9688822315cd2b205ff0bd5429b4
generic

ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/01b61e8dda9b0fdb0d4cda43de25f4e390554d7b

Vendor Advisories for CVE-2026-53309(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 149× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 149 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:25 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 02:29 UTCEPSS rescore
  7. 2026-07-18 10:04 UTCEPSS rescore
  8. 2026-07-17 05:19 UTCGHSA enrichment
  9. 2026-07-17 01:25 UTCGHSA enrichment
  10. 2026-07-16 21:30 UTCGHSA enrichment
  11. 2026-07-16 17:36 UTCGHSA enrichment
  12. 2026-07-16 17:03 UTCEPSS rescore
  13. 2026-07-16 12:39 UTCGHSA enrichment
  14. 2026-07-16 08:45 UTCGHSA enrichment
  15. 2026-07-16 04:51 UTCGHSA enrichment
  16. 2026-07-16 00:57 UTCGHSA enrichment
  17. 2026-07-15 21:02 UTCGHSA enrichment
  18. 2026-07-15 17:06 UTCGHSA enrichment
  19. 2026-07-15 16:57 UTCEPSS rescore
  20. 2026-07-15 16:57 UTCEPSS rescore
  21. 2026-07-15 13:06 UTCGHSA enrichment
  22. 2026-07-15 09:11 UTCGHSA enrichment
  23. 2026-07-15 05:10 UTCGHSA enrichment
  24. 2026-07-15 02:00 UTCEPSS rescore
  25. 2026-07-15 02:00 UTCEPSS rescore
Show 75 more
  1. 2026-07-15 00:53 UTCGHSA enrichment
  2. 2026-07-14 20:59 UTCGHSA enrichment
  3. 2026-07-14 17:05 UTCGHSA enrichment
  4. 2026-07-14 13:10 UTCGHSA enrichment
  5. 2026-07-14 09:14 UTCGHSA enrichment
  6. 2026-07-14 05:19 UTCGHSA enrichment
  7. 2026-07-14 01:24 UTCGHSA enrichment
  8. 2026-07-13 22:31 UTCEPSS rescore
  9. 2026-07-13 21:30 UTCGHSA enrichment
  10. 2026-07-13 17:35 UTCGHSA enrichment
  11. 2026-07-13 13:41 UTCGHSA enrichment
  12. 2026-07-13 09:47 UTCGHSA enrichment
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-13 06:13 UTCEPSS rescore
  15. 2026-07-13 05:52 UTCGHSA enrichment
  16. 2026-07-13 01:58 UTCGHSA enrichment
  17. 2026-07-12 22:03 UTCGHSA enrichment
  18. 2026-07-12 18:08 UTCGHSA enrichment
  19. 2026-07-12 14:13 UTCGHSA enrichment
  20. 2026-07-12 10:17 UTCGHSA enrichment
  21. 2026-07-12 06:22 UTCGHSA enrichment
  22. 2026-07-12 05:46 UTCEPSS rescore
  23. 2026-07-12 02:18 UTCGHSA enrichment
  24. 2026-07-11 22:24 UTCGHSA enrichment
  25. 2026-07-11 18:30 UTCGHSA enrichment
  26. 2026-07-11 14:35 UTCGHSA enrichment
  27. 2026-07-11 10:41 UTCGHSA enrichment
  28. 2026-07-11 08:27 UTCEPSS rescore
  29. 2026-07-11 08:27 UTCEPSS rescore
  30. 2026-07-11 06:47 UTCGHSA enrichment
  31. 2026-07-11 02:53 UTCGHSA enrichment
  32. 2026-07-10 22:58 UTCGHSA enrichment
  33. 2026-07-10 19:03 UTCGHSA enrichment
  34. 2026-07-10 15:09 UTCGHSA enrichment
  35. 2026-07-10 11:11 UTCGHSA enrichment
  36. 2026-07-10 07:16 UTCGHSA enrichment
  37. 2026-07-10 03:19 UTCGHSA enrichment
  38. 2026-07-09 23:24 UTCGHSA enrichment
  39. 2026-07-09 19:29 UTCGHSA enrichment
  40. 2026-07-09 19:10 UTCEPSS rescore
  41. 2026-07-09 19:10 UTCEPSS rescore
  42. 2026-07-09 15:33 UTCGHSA enrichment
  43. 2026-07-09 11:36 UTCGHSA enrichment
  44. 2026-07-09 07:37 UTCGHSA enrichment
  45. 2026-07-09 03:42 UTCGHSA enrichment
  46. 2026-07-08 23:48 UTCGHSA enrichment
  47. 2026-07-08 19:54 UTCGHSA enrichment
  48. 2026-07-08 15:53 UTCGHSA enrichment
  49. 2026-07-08 15:16 UTCEPSS rescore
  50. 2026-07-08 15:16 UTCEPSS rescore
  51. 2026-07-08 11:58 UTCGHSA enrichment
  52. 2026-07-08 07:47 UTCGHSA enrichment
  53. 2026-07-08 03:53 UTCGHSA enrichment
  54. 2026-07-07 23:58 UTCGHSA enrichment
  55. 2026-07-07 20:05 UTCGHSA enrichment
  56. 2026-07-07 16:08 UTCGHSA enrichment
  57. 2026-07-07 13:46 UTCEPSS rescore
  58. 2026-07-07 13:46 UTCEPSS rescore
  59. 2026-07-07 11:22 UTCGHSA enrichment
  60. 2026-07-07 07:27 UTCGHSA enrichment
  61. 2026-07-07 03:18 UTCGHSA enrichment
  62. 2026-07-06 23:24 UTCGHSA enrichment
  63. 2026-07-06 19:29 UTCGHSA enrichment
  64. 2026-07-06 16:27 UTCEPSS rescore
  65. 2026-07-06 16:27 UTCEPSS rescore
  66. 2026-07-06 15:32 UTCGHSA enrichment
  67. 2026-07-06 11:36 UTCGHSA enrichment
  68. 2026-07-06 07:41 UTCGHSA enrichment
  69. 2026-07-06 03:44 UTCGHSA enrichment
  70. 2026-07-06 02:23 UTCEPSS rescore
  71. 2026-07-06 02:23 UTCEPSS rescore
  72. 2026-07-05 23:49 UTCGHSA enrichment
  73. 2026-07-05 19:55 UTCGHSA enrichment
  74. 2026-07-05 16:00 UTCGHSA enrichment
  75. 2026-07-05 12:06 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53309?
CVE-2026-53309 is a critical vulnerability published on June 26, 2026. In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: fix off-by-one in dlmmatchregions() 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…
When was CVE-2026-53309 disclosed?
CVE-2026-53309 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53309 actively exploited?
CVE-2026-53309 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53309?
CVE-2026-53309 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-53309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53309, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-53309

Explore →

Is Your Infrastructure Affected by CVE-2026-53309?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs