CVE-2026-36499

A flaw was found in Open vSwitch. A missing upper-bound check in udpif_set_threads() allows an attacker with OVSDB write access to request an excessive number of handler or revalidation threads, causing resource exhaustion and denial of service. Reported against Open vSwitch v3.6.90; affects deployments where OVSDB is writable by untrusted parties.

Open vSwitch is vulnerable to denial of service via resource exhaustion in udpif_set_threads() due to a missing upper-bound check on thread counts. An attacker with high privileges (OVSDB write access) can configure excessive handler or revalidation threads to exhaust system resources. CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H (4.4). Affects FDP, OpenShift OVS RPMs, RHEL-7 ELS, and Fedora openvswitch packages.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.