SB20260912137 - Infinite loop in Linux kernel ceph
Published: September 12, 2026 Updated: October 1, 2026
Security Bulletin ID
SB20260912137
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Infinite loop (CVE-ID: CVE-2026-89647)
CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an infinite loop in the Ceph dentry lease reclamation logic when processing valid leases with no cap pressure. A local user can cause ceph_cap_reclaim_work() to repeatedly requeue dentry trimming to cause a denial of service.
Remediation
Install update from vendor's website.