VDB-368403 · CVE-2026-36499 · EUVD-2026-34317

Open vSwitch 3.6.90 udpif_set_threads denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Open vSwitch 3.6.90. It has been rated as problematic. This affects the function udpif_set_threads. Performing a manipulation results in denial of service. This vulnerability was named CVE-2026-36499. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Open vSwitch 3.6.90. It has been classified as critical. This affects the function udpif_set_threads. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

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.

This vulnerability is uniquely identified as CVE-2026-36499 since 04/06/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 318857 (Linux Distros Unpatched Vulnerability : CVE-2026-36499), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (318857) and EUVD (EUVD-2026-34317). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Open

Name

vSwitch

Version

3.6.90

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 6.5
VulDB Temp Score: 6.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 6.5
ADP CISA Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 318857
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-36499

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/06/2026 CVE reserved
06/04/2026 +59 days VulDB entry created
06/05/2026 +0 days Advisory disclosed
06/07/2026 +2 days VulDB entry last update

Sourcesinfo

Status: Not defined

CVE: CVE-2026-36499 (🔒)
GCVE (CVE): GCVE-0-2026-36499
GCVE (VulDB): GCVE-100-368403
EUVD: 🔒

Entryinfo

Created: 06/05/2026 00:45
Updated: 06/07/2026 01:53
Changes: 06/05/2026 00:45 (61), 06/06/2026 08:53 (2), 06/07/2026 01:53 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.