Improper Initialization in Linux kernel - CVE-2026-74742
Published: August 27, 2026
Vulnerability identifier: #VU145986
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74742
CWE-ID: CWE-665
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper initialization in veth_poll when handling packet processing on a multi-queue setup with GRO enabled and no XDP program attached. A remote attacker can trigger traffic that causes a peer transmit queue to remain stopped indefinitely to cause a denial of service.
The issue affects the plain GRO/NAPI path because the queue index used to wake the peer transmit queue remains incorrect unless an XDP program has been attached.
Affected software
Linux kernel
How to mitigate CVE-2026-74742
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3