CVE-2026-53309

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-26. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

June 26, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 19, 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/01b61e8dda9b0fdb0d4cda43de25f4e390554d7b
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/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/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/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/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/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/760ab35040aca8399021fdb9ff1db1089feb7194

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.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-08-25ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-28.28) @ resolute2026-08-25ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-08-25ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-08-25ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-08-25ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-08-25ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-08-25ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-25ubuntu
ubuntulinux-tools-lowlatency-hwe-22.04-edge (6.8.0-136.136.2~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-08-25ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-08-25ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-08-25ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-25ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-08-25ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-08-25ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-25ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-08-25ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-08-25ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-08-25ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-08-25ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-08-25ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-25ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.257.241) @ bionic2026-08-25ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (137 versions)7.0.10-1—

Weakness Classification(1)

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

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 69× in last 7d / 366× 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 531 total refreshes for this CVE.

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

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 August 5, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 47.6% of all scored CVEs.
What is the CVSS score of CVE-2026-53309?
CVE-2026-53309 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
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

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