CVE-2026-53309
ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison
Description
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.
INFO
Published Date :
June 26, 2026, 8:17 p.m.
Last Modified :
July 6, 2026, 8:14 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to the corrected version.
- Apply the patch for ocfs2/dlm.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53309.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53309 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53309
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53309 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53309 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Jul. 06, 2026
Action Type Old Value New Value Added CWE CWE-193 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.141 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.91 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.33 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.209 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.37 up to (excluding) 5.10.258 Added Reference Type kernel.org: https://git.kernel.org/stable/c/01b61e8dda9b0fdb0d4cda43de25f4e390554d7b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1fb7f356547d9688822315cd2b205ff0bd5429b4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/2a0673836f019e7c032acbf48d022d5ccf02a845 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/426cd8eedac89b86148d4478990eeef16e8a2520 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/760ab35040aca8399021fdb9ff1db1089feb7194 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/819d8ebad3200a53de99bd7e297bc428e41ced54 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c60a2710b73838d250cda57344c049b89abc5d52 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d5403ae28085761d58b555645bc7d5feadb10073 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 26, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'ea2034416b54700e30371f2ad6517cbb94674083', 'lessThan': '760ab35040aca8399021fdb9ff1db1089feb7194', 'versionType': 'git'}, {'status': 'affected', 'version': 'ea2034416b54700e30371f2ad6517cbb94674083', 'lessThan': 'c60a2710b73838d250cda57344c049b89abc5d52', 'versionType': 'git'}, {'status': 'affected', 'version': 'ea2034416b54700e30371f2ad6517cbb94674083', 'lessThan': '2a0673836f019e7c032acbf48d022d5ccf02a845', 'versionType': 'git'}, {'status': 'affected', 'version': 'ea2034416b54700e30371f2ad6517cbb94674083', 'lessThan': '819d8ebad3200a53de99bd7e297bc428e41ced54', 'versionType': 'git'}, {'status': 'affected', 'version': 'ea2034416b54700e30371f2ad6517cbb94674083', 'lessThan': 'd5403ae28085761d58b555645bc7d5feadb10073', 'versionType': 'git'}, {'status': 'affected', 'version': 'ea2034416b54700e30371f2ad6517cbb94674083', 'lessThan': '1fb7f356547d9688822315cd2b205ff0bd5429b4', 'versionType': 'git'}, {'status': 'affected', 'version': 'ea2034416b54700e30371f2ad6517cbb94674083', 'lessThan': '426cd8eedac89b86148d4478990eeef16e8a2520', 'versionType': 'git'}, {'status': 'affected', 'version': 'ea2034416b54700e30371f2ad6517cbb94674083', 'lessThan': '01b61e8dda9b0fdb0d4cda43de25f4e390554d7b', 'versionType': 'git'}], 'programFiles': ['fs/ocfs2/dlm/dlmdomain.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.37'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.37', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.258', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.141', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/ocfs2/dlm/dlmdomain.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/01b61e8dda9b0fdb0d4cda43de25f4e390554d7b Added Reference https://git.kernel.org/stable/c/1fb7f356547d9688822315cd2b205ff0bd5429b4 Added Reference https://git.kernel.org/stable/c/2a0673836f019e7c032acbf48d022d5ccf02a845 Added Reference https://git.kernel.org/stable/c/426cd8eedac89b86148d4478990eeef16e8a2520 Added Reference https://git.kernel.org/stable/c/760ab35040aca8399021fdb9ff1db1089feb7194 Added Reference https://git.kernel.org/stable/c/819d8ebad3200a53de99bd7e297bc428e41ced54 Added Reference https://git.kernel.org/stable/c/c60a2710b73838d250cda57344c049b89abc5d52 Added Reference https://git.kernel.org/stable/c/d5403ae28085761d58b555645bc7d5feadb10073