SB20260912138 - Resource exhaustion in Linux kernel ceph
Published: September 12, 2026 Updated: October 1, 2026
Security Bulletin ID
SB20260912138
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2026-89648)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in ceph_parse_deleg_inos() when processing MDS create-with-delegation replies. A remote privileged user can send a reply containing excessively large or numerous delegated-inode intervals to cause a denial of service.
Exploitation requires control of a Ceph MDS.
Remediation
Install update from vendor's website.