B&R Automation X20EDS410 Write-what-where Condition (CVE-2026-43284)

high Tenable OT Security Plugin ID 505890

Synopsis

The remote OT asset is affected by a vulnerability.

Description

The Linux kernel version shipped with the affected B&R product (X20EDS410) is affected by a vulnerability. A flaw in the kernel's xfrm ESP input path that decrypts in place over shared skb frags.

Successful local exploitation of this vulnerability could allow an authenticated attacker with low privileges to escalate privileges to root on the affected system.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

B&R recommends that users update affected products to the latest available version and apply their defense in depth for B&R products strategy. For details on this issue, please refer to the corresponding ABB PSIRT security advisory (SA26P010).

Plugin Details

Severity: High

ID: 505890

File Name: tenable_ot_brautomation_CVE-2026-43284.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 7/30/2026

Updated: 7/30/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

Percentile: 99.86

CVSS v3

Risk Factor: High

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/h:br-automation:x20eds410

Required KB Items: Tenable.ot/BRAutomation

Exploit Ease: No known exploits are available

Patch Publication Date: 6/11/2026

Vulnerability Publication Date: 6/11/2026

Reference Information

CVE: CVE-2026-43284

CWE: 123

ICSA: 26-174-06

Detections

Analytics