Critical severity · published Jun 26, 2026
CVE-2026-53309
ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison
9.8
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
2.6.37 before 5.10.258; 5.11 before 5.15.209; 5.16 before 6.1.175; 6.2 before 6.6.141; 6.7 before 6.12.91; 6.13 before 6.18.33; +1 more · source: NVD
LI
Linux · Linux
ea2034416b54700e30371f2ad6517cbb94674083 before 760ab35040aca8399021fdb9ff1db1089feb7194; ea2034416b54700e30371f2ad6517cbb94674083 before c60a2710b73838d250cda57344c049b89abc5d52; ea2034416b54700e30371f2ad6517cbb94674083 before 2a0673836f019e7c032acbf48d022d5ccf02a845; ea2034416b54700e30371f2ad6517cbb94674083 before 819d8ebad3200a53de99bd7e297bc428e41ced54; ea2034416b54700e30371f2ad6517cbb94674083 before d5403ae28085761d58b555645bc7d5feadb10073; ea2034416b54700e30371f2ad6517cbb94674083 before 1fb7f356547d9688822315cd2b205ff0bd5429b4; +3 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53309
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53309
Patch
https://git.kernel.org/stable/c/01b61e8dda9b0fdb0d4cda43de25f4e390554d7b
Patch
https://git.kernel.org/stable/c/1fb7f356547d9688822315cd2b205ff0bd5429b4
Patch
https://git.kernel.org/stable/c/2a0673836f019e7c032acbf48d022d5ccf02a845
Patch
https://git.kernel.org/stable/c/426cd8eedac89b86148d4478990eeef16e8a2520
Patch
https://git.kernel.org/stable/c/760ab35040aca8399021fdb9ff1db1089feb7194
Patch
https://git.kernel.org/stable/c/819d8ebad3200a53de99bd7e297bc428e41ced54
More from Kernel
9.8
CVE-2025-39682
tls: fix handling of zero-length records on the rx_list
8.8
CVE-2026-53266
netfilter: bridge: make ebt_snat ARP rewrite writable
8.8
CVE-2013-6282
Linux Kernel Improper Input Validation Vulnerability
8.4
CVE-2022-0185
Linux Kernel Heap-Based Buffer Overflow Vulnerability
8.4
CVE-2013-2094
Linux Kernel Privilege Escalation Vulnerability