Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-45859
Published: May 28, 2026
Vulnerability identifier: #VU132623
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-45859
CWE-ID: CWE-670
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper state handling in nfnetlink_queue when processing UDP GSO packets with an unconfirmed nf_conn entry. A remote attacker can send specially crafted network traffic to cause a denial of service.
The issue occurs when an application has not enabled the F_GSO capability flag.
How to mitigate CVE-2026-45859
Install security update from vendor's repository.