In the Linux kernel, the following vulnerability has been resolved: interconnect: Fix locking for runpm vs reclaim. This vulnerability allows icc_bw_set() to be called in call paths that could deadlock against shrinker/reclaim, such as runpm resume. To mitigate this, a new icc_bw_lock has been introduced for cases where it is necessary to serialize bandwidth aggregation and update. This decouples the locking mechanism from paths requiring memory allocation, such as node or link creation and destruction.
The fix addresses a potential circular locking dependency, which can be seen in the lockdep splat warnings. The detailed warning indicates that a task is trying to acquire a lock while already holding another lock that depends on it, leading to a potential deadlock situation.
Given the nature of this vulnerability and its resolution, organizations using the Linux kernel should remain vigilant. The vulnerability's severity is currently classified as unknown, and there are no known exploits or public proofs of concept available. However, organizations are advised to monitor their systems for any unusual behavior that might suggest exploitation attempts.
Although the urgency for remediation is low, organizations should still consider assessing their systems in light of this information. Keeping the Linux kernel up to date is essential for maintaining security posture and mitigating any potential risks.
Vulnerability Details
The vulnerability in question is related to the interconnect locking mechanism within the Linux kernel. The specific issue arises in scenarios where the function icc_bw_set() could lead to a deadlock. The introduction of a new locking mechanism aims to resolve this issue by decoupling the locking for bandwidth aggregation from memory allocation paths.
Published on December 24, 2025, this vulnerability has been classified as deferred. The official description indicates that it resolves potential circular locking dependencies that could occur under specific circumstances.
Technical Analysis
The root cause of this vulnerability stems from the way locking dependencies are handled within the Linux kernel's interconnect subsystem. When icc_bw_set() is called, the existing locking mechanism can lead to a scenario where both the icc_lock and other locks are held simultaneously, resulting in a potential deadlock.
The attack vector for this vulnerability is classified as unknown, indicating that the specific method of exploitation has not been identified. The complexity of exploiting this vulnerability is likely low, given the nature of the locking mechanism.
No user interaction is required for exploitation, but the vulnerability does involve potential impacts on confidentiality, integrity, and availability due to the locking mechanism affecting resource access.
Risk & Impact Analysis
Risk to organizations includes potential service interruptions if the deadlock were to occur, particularly in systems relying heavily on the Linux kernel. The blast radius for this vulnerability is broad, affecting all instances where the Linux kernel is deployed.
Given the low EPSS score of 0.000270000, this vulnerability is not currently assessed as a high-risk factor for exploitation. Organizations should nonetheless ensure that their systems are updated with the latest kernel patches to mitigate potential issues.
Organizations should assess their vulnerability management processes to ensure they are capable of identifying and remediating similar issues effectively in the future.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Currently, the specific versions affected by CVE-2023-54013 are not provided. Organizations should consider that all versions of the Linux kernel prior to the resolution may be at risk.
Mitigation & Remediation
To mitigate the risks associated with this vulnerability, organizations should ensure their Linux kernel is updated to the latest version where this vulnerability is resolved. It is essential to regularly monitor the kernel updates and apply them promptly.
In cases where immediate patching is not feasible, organizations may consider implementing configuration hardening practices to limit exposure. This includes restricting access to critical kernel functionalities and monitoring for unusual behaviors that may indicate exploitation attempts.
For effective remediation, organizations should engage in continuous penetration testing and security assessments to evaluate their security posture and identify similar weaknesses proactively. For more information, organizations should explore penetration testing services that help validate the effectiveness of security measures.
Detection Guidance
Organizations should monitor system logs for indicators related to interconnect locking mechanisms and unusual resource access patterns. Behavioral anomalies that suggest deadlock conditions should also be investigated promptly.
Additionally, network signatures related to the Linux kernel's locking mechanisms might be useful for detecting potential exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-54013 lies in the potential for circular dependencies in kernel locking mechanisms. This vulnerability highlights the need for robust locking strategies in kernel development to prevent similar issues in the future.
Security teams should take this opportunity to review their kernel configurations and ensure that they are following best practices for kernel security. Additionally, this incident serves as a reminder of the importance of maintaining an up-to-date kernel to avoid similar vulnerabilities.
Organizations can learn from this vulnerability by investing in training for developers regarding secure coding practices and kernel development. Enhancing awareness around locking mechanisms and their implications can significantly reduce the risk of future vulnerabilities.
For further insights into application security, organizations are encouraged to explore additional resources like penetration testing methodology and vulnerability management best practices to strengthen their defenses.
In conclusion, although CVE-2023-54013 does not currently present a high risk, organizations should remain proactive in their security efforts to address potential vulnerabilities within their systems.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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