Use-after-free in Linux kernel - CVE-2026-74533
Published: August 16, 2026
Vulnerability identifier: #VU143250
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74533
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 or execute arbitrary code.
The vulnerability exists due to a use-after-free race condition in the Bluetooth ISO connection handling in net/bluetooth/iso.c when processing Bluetooth ISO data and connection teardown. A local user can trigger concurrent access to hci_conn->iso_data to cause a denial of service or execute arbitrary code.
The issue involves unsynchronized access to hci_conn->iso_data during iso_recv(), iso_conn_put(), iso_conn_add(), and iso_conn_free().
Affected software
Linux kernel
How to mitigate CVE-2026-74533
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3