CVE-2026-64531

CVE-2026-64531 — OVSwrap Linux kernel Open vSwitch module local privilege escalation normal user → root PoC. Exploits the integer wraparound of the 16-bit nlalen field to escalate from a normal user all the way to root. Vulnerability Summary When the nested action stream generated by OVS exceeds...

OVSwrap

OVSwrap CVE-2026-64531 Writeup !WARNING The PoC is provided solely to help defenders, maintainers, and authorized security teams validate patches, mitigations, detections, and exposure on systems they own or are explicitly authorized to test. You are solely responsible for ensuring that your use ...

K000162959: Linux kernel vulnerability CVE-2026-64531

Security Advisory Description In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: reject oversized nested action attrs Open vSwitch stores generated flow actions as nlattrs, whose nlalen field is u16. Commit a1e64addf3ff "net: openvswitch: remove misbehaving...

CVE-2025-37789 net: openvswitch: fix nested key length validation in the set() action

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix nested key length validation in the set action It's not safe to access nlalenovskey if the data is smaller than the netlink header. Check that the attribute is OK first...