NULL pointer dereference in Linux kernel - CVE-2026-74734
Published: August 27, 2026
Vulnerability identifier: #VU145994
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-74734
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in ar_context_release() in the firewire ohci driver when handling device probe error cleanup. A local attacker can trigger an early pci_probe() failure to cause a denial of service.
The issue occurs on the driver's error handling path before the asynchronous receive context has been successfully initialized.
Affected software
Linux kernel
How to mitigate CVE-2026-74734
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3