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Fencer Vulns
medium 6.5

CVE-2026-36499 json

A missing upper-bound check in the udpif_set_threads() function of Open vSwitch v3.6.90 allows an attacker with OVSDB write access to reque…

published 2026-06-04 5 mo ago modified 2026-07-22 3 mo ago also EUVD-2026-34317

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

A missing upper-bound check in the udpif_set_threads() function of Open vSwitch v3.6.90 allows an attacker with OVSDB write access to request an excessive number of handler or revalidation threads. This can cause a denial of service (DoS) via resource exhaustion.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-36499 updated cvss 4.4

openvswitch: Open vSwitch: Denial of service via resource exhaustion due to missing upper-bound check

  • Red Hat Fast Datapath for RHEL 7 openvswitch, openvswitch2.10, openvswitch2.11, openvswitch2.12, openvswitch2.13, openvswitch-test, +19 more Red Hat Fast Datapath for RHEL 8 openvswitch3.1, openvswitch2.11, openvswitch2.12, openvswitch2.13, openvswitch2.15, openvswitch2.16, +27 more Red Hat Fast Datapath for RHEL 9 openvswitch3.0, openvswitch3.1, openvswitch3.2, openvswitch3.3, openvswitch3.4, openvswitch3.5, +26 more Red Hat Fast Datapath for RHEL 10 openvswitch3.5, openvswitch3.6, openvswitch3.5-test, openvswitch3.6-test, openvswitch3.5-ipsec, openvswitch3.6-ipsec, +2 more Red Hat OpenShift Container Platform 4 openvswitch3.0, openvswitch3.1, openvswitch2.17, openvswitch3.0-test, openvswitch3.1-test, openvswitch2.17-test, +7 more
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 7 openvswitch, openvswitch-test, python-openvswitch, openvswitch-controller
    under investigation

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/majdlatah/OVS-Other-Config-Bug referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.