CVE-2026-6424 in Endpoint Antivirus for Linux
Summary
by MITRE • 07/16/2026
Use-after-free vulnerability in ESET Linux products potentially allowed an attacker to trigger kernel panic on the system
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Analysis
by VulDB Data Team • 07/16/2026
This use-after-free vulnerability within ESET Linux products represents a critical memory safety issue that could potentially lead to system instability and denial of service conditions. The flaw occurs when the software improperly handles memory deallocation, allowing an attacker to manipulate freed memory regions and execute arbitrary code at kernel level. Such vulnerabilities fall under the common weakness enumeration CWE-416 which specifically addresses use-after-free conditions where program memory is accessed after it has been freed by the system. The vulnerability manifests in ESET's Linux security solutions when processing certain input data structures, creating opportunities for attackers to exploit the memory management errors and trigger unexpected behavior.
The technical exploitation of this vulnerability requires an attacker to craft specific inputs that cause the affected ESET components to free memory regions while still maintaining references to them. Once freed, these memory locations can be reallocated and manipulated by malicious code, leading to potential privilege escalation or system compromise. The kernel panic condition occurs when the operating system detects the corrupted memory state and initiates a protective shutdown sequence to prevent further damage to system integrity. This type of exploitation aligns with attack patterns documented in the mitre ATT&CK framework under the system service manipulation and privilege escalation techniques that target kernel-level vulnerabilities.
The operational impact extends beyond simple denial of service as this vulnerability could enable attackers to gain unauthorized access to protected systems, potentially compromising sensitive data and disrupting critical operations. Organizations running ESET Linux security solutions face significant risks when this vulnerability remains unpatched, particularly in environments where system stability and continuous operation are paramount. The vulnerability affects various ESET products including endpoint protection, antivirus engines, and system monitoring components that operate at kernel level. Security teams must consider the potential for persistent threats that could leverage this weakness to establish footholds within network infrastructure.
Mitigation strategies should prioritize immediate patch deployment from ESET as the primary defense mechanism against exploitation attempts. System administrators should also implement additional monitoring controls to detect anomalous behavior patterns that might indicate exploitation activity, particularly focusing on kernel-level memory operations and system crash events. Network segmentation and access controls can help limit the potential impact of successful exploitation attempts by restricting lateral movement within compromised environments. Organizations should conduct thorough vulnerability assessments to identify all instances of affected ESET products and establish monitoring procedures for detecting potential exploitation signatures in their network traffic. Compliance with industry standards including iso 27001 and nist cyber security framework becomes critical when managing such vulnerabilities, as they require systematic approaches to identifying, assessing, and remediating security weaknesses across enterprise environments.