VSEC_V4_2026_05_0001: CopyFail (CVE-2026-31431) privilege escalation

Summary

The Linux version used by VaelsysOS is affected by the local privilege-escalation vulnerability known as CopyFail, which may allow an attacker with the ability to execute commands as a non-privileged user to obtain a root shell on the underlying operating system.

In the case of VaelsysOS, remote exploitation through the network is not expected to be possible, as the platform is designed to prevent direct operating system command execution from network-accessible services. Additionally, vulnerabilities that could have potentially enabled similar attack paths in previous versions have already been addressed and remediated. Nevertheless, additional hardening measures and patches have been implemented to ensure systems remain protected in the event that an undiscovered vulnerability could provide command execution capabilities in the future.

VaelsysOS does allow limited physical command execution when an attacker gains direct physical access to the video analytics device. In such scenarios, commands are executed under a heavily restricted desktop user environment intended to limit system interaction and exploitation capabilities. While these restrictions significantly increase the difficulty of successfully exploiting the vulnerability for low-skilled attackers, practical exploitation may remain possible for determined or experienced adversaries. For this reason, the security patch is considered necessary to protect devices against local attacks involving physical access.

Impacted products

• VaelsysV4 (VaelsysOS 8) – All versions
• VaelsysV4 (VaelsysOS 10) – System version <= 10.1.0.20230906
• VaelsysV4 (VaelsysOS 12) – System version <= 12.2.1.20250129

Vulnerability details

Identifier

This issue is tracked internally as VSEC_V4_2026_05_0001 and is related to the publicly disclosed Linux local privilege-escalation vulnerability known as CopyFail. Additional information is available from the official disclosure at copy.fail.

Severity

This vulnerability is considered High severity because successful exploitation may allow an attacker with access to execute commands as a non-privileged local user to escalate privileges and obtain root access on the affected operating system.

In VaelsysOS, exploitation is limited to scenarios where an attacker is able to gain local command execution capabilities, either through physical access to the device or through another undiscovered vulnerability that enables operating system command execution. Direct remote exploitation through standard network services is not expected under normal operating conditions.

Vulnerability verification

Vaelsys references the public proof-of-concept exploit published by the researchers behind the CopyFail disclosure to verify whether a target system is vulnerable to the local privilege-escalation issue tracked internally as VSEC_V4_2026_05_0001.

copy_fail_exp.py

Resolution

Mitigation status

At this time, the issue has been mitigated through additional hardening measures based on the recommendations published by the researchers behind the CopyFail disclosure. These changes are intended to prevent practical exploitation of the vulnerability on affected VaelsysOS systems.

The implemented protections reduce the risk of local privilege escalation by preventing the known exploitation techniques currently publicly available.

Because exploitation requires local command execution capabilities, Vaelsys additionally reviewed local access restrictions and reinforced protections around restricted desktop-user environments to further reduce the attack surface on deployed systems.

Published updates

Updated software versions have been released for supported VaelsysV4 platforms in order to mitigate this vulnerability. Customers are strongly advised to update affected systems to the latest available versions through the integrated update mechanism.

Workarounds and mitigations

• Restrict physical access to Vaelsys video analytics devices to authorized personnel only.
• Ensure devices are updated to the latest mitigated VaelsysOS version through the integrated update mechanism provided by Vaelsys.
• Continue restricting network exposure of management and administrative services to trusted networks only, reducing the likelihood of chained exploitation through other vulnerabilities.
• Monitor systems for unauthorized physical access attempts or unexpected local user activity that could indicate exploitation attempts targeting local privilege-escalation vulnerabilities.

Acknowledgments and source

Information about this vulnerability is based in part on the public research, technical analysis, and proof-of-concept material published by the researchers behind the CopyFail disclosure available at copy.fail.

Vaelsys also acknowledges the public security research community and the maintainers of the related Linux security advisories and vulnerability tracking entries that contributed to the analysis and remediation of this issue.