SB2026062657 - Improper update of reference count in Linux kernel bluetooth
Published: June 26, 2026
Security Bulletin ID
SB2026062657
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper update of reference count (CVE-ID: CVE-2026-53251)
CWE-ID: CWE-911 - Improper Update of Reference Count
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper reference count management in iso_conn_big_sync when handling Bluetooth ISO BIG sync operations. A local user can trigger the vulnerable code path to cause a denial of service.
Remediation
Install update from vendor's website.