How CVE-2026-64531 Enables Linux Root Privilege Escalation via Open vSwitch | The CyberSec Guru

OVSwrap (CVE-2026-64531): How a 13-Year-Old Open vSwitch Bug Became a Reliable Linux Root Exploit

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CVE-2026-64531 (OVSwrap) is a recently

disclosed Linux kernel privilege escalation vulnerability affecting the Open vSwitch datapath. The flaw is particularly notable because the vulnerable code had existed for roughly 13 years but remained practically unreachable until a 2025 change removed a long-standing size limit, exposing an integer wraparound that can lead to kernel memory corruption. The published proof of concept also demonstrates an unusually reliable exploitation path compared to many traditional kernel exploits

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To get rid of the vulnerability, just blacklist the Open vSwitch kernel module if, for whatever reason, you have it installed. As far as I can tell, you probably don’t need it unless the machine in question is acting as a switch or router.

No need for an urgent kernel update this time.

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Or some specific OSes like Proxmox…which is heavily geared towards VMs. Other than that, mitigation steps mentioned works

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