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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100

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%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

Published

June 26, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Oct 8, 2026
Patch available.
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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-09-23ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-28.28) @ resolute2026-09-23ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-09-23ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-09-23ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-09-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-23ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-09-23ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-09-23ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1059.62~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-09-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-09-23ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-23ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-09-23ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-09-23ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-09-23ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1061.64~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-09-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-09-23ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-09-23ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-09-23ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.257.269~16.04.1) @ xenial2026-09-23ubuntu
ubuntulinux-tools-oracle (4.15.0.1158.169~16.04.1) @ xenial2026-09-23ubuntu

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 rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)
  • every version up to 5.10.259-1: fixed in 5.10.259-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)
  • every version up to 6.1.176-1~deb11u1: fixed in 6.1.176-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)
  • every version up to 6.1.176-1: fixed in 6.1.176-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (141 versions)
  • every version up to 7.0.10-1: fixed in 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 7× in last 7d / 47× 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 604 total refreshes for this CVE.

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

Related CVEs(same vendor + 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 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 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53309?
CVE-2026-53309 has a CVSS base score of 9.8 (the CNA's own assessment, by linux; NVD's own analysis pending).
How do I remediate CVE-2026-53309?
A fix for CVE-2026-53309 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53309 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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