SB2026082851 - Use-after-free in Linux kernel bluetooth
Published: August 28, 2026
Security Bulletin ID
SB2026082851
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) Use-after-free (CVE-ID: CVE-2026-80721)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the Bluetooth ISO socket handling in net/bluetooth/iso.c when deleting an ISO connection. A local user can trigger connection deletion while ISO sockets still access a dangling hcon reference to cause a denial of service.
The issue is related to races involving ISO connection teardown and stale hcon references.
Remediation
Install update from vendor's website.