NULL pointer dereference in Linux kernel - CVE-2026-64404
Published: July 27, 2026
Vulnerability identifier: #VU139556
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-2026-64404
CWE-ID: CWE-476
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 a NULL pointer dereference in iso_conn_big_sync() when handling recvmsg on a PA-sync broadcast sink socket during connection teardown. A local user can trigger a race condition to cause a denial of service.
The issue is reachable from iso_sock_recvmsg() for a PA-sync broadcast sink socket with BT_SK_DEFER_SETUP and BT_SK_PA_SYNC set.
Affected software
Linux kernel
How to mitigate CVE-2026-64404
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3