CVE-2014-0181 in Linux
Summary
by MITRE
The Netlink implementation in the Linux kernel through 3.14.1 does not provide a mechanism for authorizing socket operations based on the opener of a socket, which allows local users to bypass intended access restrictions and modify network configurations by using a Netlink socket for the (1) stdout or (2) stderr of a setuid program.
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Analysis
by VulDB Data Team • 05/12/2026
The vulnerability identified as CVE-2014-0181 represents a critical authorization flaw within the Linux kernel's Netlink implementation that affects versions through 3.14.1. This issue stems from the absence of proper socket operation authorization mechanisms, creating a significant security gap that allows local attackers to circumvent intended access controls. The flaw specifically manifests when setuid programs utilize Netlink sockets for their standard output or error streams, enabling unauthorized modification of network configurations. The vulnerability operates at the kernel level, making it particularly dangerous as it can be exploited by any local user with minimal privileges to gain elevated capabilities.
The technical root cause of this vulnerability lies in the kernel's failure to implement proper authorization checks for Netlink socket operations. When a setuid program executes, it typically runs with elevated privileges to perform system-level operations. However, the Netlink implementation does not verify whether the socket operations originate from the legitimate process owner or have been manipulated by a local attacker. This authorization bypass occurs because the kernel's Netlink subsystem lacks mechanisms to authenticate socket operations based on the actual opener of the socket. The flaw is particularly insidious because it leverages the legitimate use of Netlink sockets by privileged processes, making the attack vector appear benign to the system's security monitoring mechanisms. The vulnerability falls under CWE-284, which addresses improper access control, and specifically relates to inadequate authorization checks in kernel-level network operations.
The operational impact of CVE-2014-0181 extends far beyond simple privilege escalation, as it provides attackers with the capability to modify critical network configurations without proper authorization. Local users can exploit this vulnerability to alter routing tables, network interface settings, and other essential network parameters that control system connectivity and security posture. The implications are particularly severe in multi-user environments where a compromised low-privilege account could potentially disrupt network services, redirect traffic, or create backdoors for further attacks. This vulnerability directly enables techniques categorized under ATT&CK tactic T1068, which involves exploiting legitimate credentials and privileges to gain system access. The ability to manipulate network configurations through a simple local exploit creates opportunities for attackers to establish persistent access, conduct man-in-the-middle attacks, or disable network security controls.
Mitigation strategies for CVE-2014-0181 primarily involve applying the official kernel patches released by the Linux kernel community, which address the authorization gap in the Netlink implementation. System administrators should prioritize updating to kernel versions 3.14.2 or later, where the vulnerability has been properly resolved through enhanced socket operation authorization checks. Additionally, implementing network monitoring solutions that can detect anomalous Netlink socket usage patterns provides an additional layer of defense. Organizations should also consider restricting the use of setuid programs where possible and implementing proper access controls for network configuration interfaces. The vulnerability serves as a reminder of the critical importance of kernel-level security controls and demonstrates how seemingly minor authorization flaws can lead to significant system compromise. Regular security audits of kernel components and network configurations should be conducted to identify similar authorization gaps that could be exploited by malicious actors.