Use-after-free in Linux kernel - CVE-2026-74530
Published: August 16, 2026
Vulnerability identifier: #VU143247
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74530
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in hci_connect_big_sync() callback handling in net/bluetooth/hci_sync.c when processing Bluetooth BIG sync connection operations. A local user can trigger a race condition leading to use of a freed connection object to cause a denial of service.
The issue is described as theoretical and occurs if the connection object is freed while the hci_sync task is running.
Affected software
Linux kernel
How to mitigate CVE-2026-74530
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3