SB20260912126 - Out-of-bounds read in Linux kernel ceph
Published: September 12, 2026
Security Bulletin ID
SB20260912126
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) Out-of-bounds read (CVE-ID: CVE-2026-89651)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the Ceph MDS client handle_session() function when processing MDSCapAuth records in a CEPH_SESSION_OPEN message. A remote attacker can send a specially crafted session-open message to cause a denial of service.
Only CEPH_SESSION_OPEN messages with a message version of 6 or later are affected.
Remediation
Install update from vendor's website.