CVE-2025-52565 is a high-severity vulnerability found in the Linux Foundation's runc, a CLI tool designed for spawning and running containers according to the OCI specification. The vulnerability affects multiple versions of runc, specifically from versions 1.0.0-rc3 to 1.2.7, 1.3.0-rc.1 to 1.3.2, and 1.4.0-rc.1 to 1.4.0-rc.2. The issue arises from insufficient checks when bind-mounting `/dev/pts/$n` to `/dev/console` within containers, enabling attackers to manipulate the bind-mounting paths, which are usually read-only or masked.
This vulnerability has similarities to CVE-2025-31133, targeting a comparable flaw in a different context, specifically in the bind-mount of `/dev/pts/$n` to `/dev/console` for all containers allocating a console. Although this vulnerability cannot directly modify host files due to its timing after `pivot_root(2)`, it could still lead to denial of service on the host or facilitate a container breakout by providing writable access to critical system files like `/proc/sysrq-trigger` or `/proc/sys/kernel/core_pattern`.
The vulnerability was published on November 6, 2025, and has been analyzed for its potential impact. Organizations utilizing affected versions of runc should prioritize patching to mitigate risks. The issue has been resolved in subsequent releases, specifically versions 1.2.8, 1.3.3, and 1.4.0-rc.3.
Given the severity of this vulnerability, organizations should prioritize patching immediately. The risk includes potential denial of service and unauthorized access to sensitive system configurations.
Vulnerability Details
The official description of CVE-2025-52565 outlines that it is a privilege escalation vulnerability arising from insufficient validation during the bind-mounting process. The CVSS score for this vulnerability is 8.4, categorizing it as high severity due to its potential impact on system integrity and security.
The affected product is the runc component developed by the Linux Foundation, with the vulnerability disclosed on November 6, 2025. The classification under CWE-61 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-363 (Race Condition in a Security Feature) further emphasizes the technical weaknesses that allow exploitation.
Technical Analysis
The root cause of this vulnerability is attributed to the lack of robust checks during the bind-mounting process in runc. Specifically, it occurs when `/dev/pts/$n` is bind-mounted to `/dev/console`, which can be exploited by attackers to gain unauthorized write access to normally protected paths.
The attack vector is categorized as local, meaning that the attack must originate from within the same local environment as the targeted container. The attack complexity is considered low, requiring no special privileges or user interaction, which enhances the risk profile of this vulnerability.
In terms of impact, the confidentiality, integrity, and availability of the affected systems could be significantly compromised. The potential for attackers to gain writable access to critical system files increases the risk of service disruption and data integrity violations.
Risk & Impact Analysis
Organizations deploying runc should be aware of the real-world risks associated with CVE-2025-52565. The flaw presents a potential blast radius that could affect not only individual containers but also the host system, leading to widespread service disruptions and unauthorized access to sensitive configurations.
Given the high CVSS score and the lack of known exploits, organizations are urged to address this vulnerability in their priority patch cycle. The urgency is heightened by the potential for a denial of service or container breakout, which could have significant operational impacts.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of runc are: 1.0.0-rc3 through 1.2.7, 1.3.0-rc.1 through 1.3.2, and 1.4.0-rc.1 through 1.4.0-rc.2. Organizations not on these versions should prioritize upgrading to 1.2.8, 1.3.3, or 1.4.0-rc.3 to mitigate the risks associated with this vulnerability.
Mitigation & Remediation
Organizations should upgrade to the fixed versions of runc: 1.2.8, 1.3.3, or 1.4.0-rc.3. If immediate patching is not possible, consider implementing workarounds such as restricting container configurations to disallow writable mounts where feasible.
Additionally, organizations should enforce network controls to limit exposure and monitor system logs for any unusual activity related to the runc component. Regular audits and security assessments can help identify potential vulnerabilities before they can be exploited.
To enhance security, organizations may also benefit from engaging in penetration testing to validate their configurations against known vulnerabilities.
Detection Guidance
Organizations should monitor logs for indicators of exploitation related to runc. Behavioral anomalies such as unexpected changes in container permissions or configurations should be flagged for further investigation.
Network signatures indicating unauthorized access attempts to `/proc/sysrq-trigger` or `/proc/sys/kernel/core_pattern` can also serve as critical detection points. Additionally, any unexpected container behavior should be thoroughly investigated to prevent potential breaches.
AppSecure Threat Intelligence Insight
CVE-2025-52565 highlights a significant risk in container management systems, emphasizing the need for robust security practices when deploying containerized applications. This vulnerability reflects a broader trend of increasing sophistication in container-based attacks, urging organizations to enhance their security posture.
Security teams should prioritize continuous monitoring and periodic assessments to identify vulnerabilities in their container environments. Engaging in proactive security measures, such as implementing strict access controls and conducting regular security audits, can significantly reduce the risk of similar vulnerabilities impacting organizational security.
For further insights, organizations can explore cloud penetration testing strategies to strengthen their defenses against emerging threats.
Additionally, organizations should consider investing in penetration testing methodology to enhance their understanding of potential attack vectors and improve their incident response strategies.
Overall, CVE-2025-52565 serves as a vital reminder for organizations to remain vigilant and proactive in their security practices, especially in the ever-evolving landscape of container security.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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