Use-after-free in Linux kernel - CVE-2026-89569
Published: September 12, 2026
Vulnerability identifier: #VU149243
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89569
CWE-ID: CWE-416
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to access freed RFCOMM session and data link connection objects.
The vulnerability exists due to use-after-free in the RFCOMM security confirmation handler rfcomm_security_cfm() when processing Bluetooth security confirmations concurrently with RFCOMM session teardown. A remote attacker can trigger the concurrent processing to access freed RFCOMM session and data link connection objects.
Affected software
Linux kernel
How to mitigate CVE-2026-89569
Install security update from vendor's repository.