In the Linux kernel, a vulnerability has been identified concerning the nfc: nci functionality, which impacts the proper completion of data exchanges during device closure. This issue arises within the nci_close_device() method, where pending data exchanges are not completed before the device is closed. As a result, socket references may leak, leading to potential resource exhaustion and instability in the system.
The severity level of this vulnerability is classified as medium, with a CVSS score of 5.5. This rating indicates that while the vulnerability poses a risk, the potential for widespread exploitation is limited. However, the impact on system availability is high, making it crucial for organizations to address this issue promptly.
Risk to organizations includes system instability and potential service disruptions due to resource leaks. Given the nature of the Linux kernel and its widespread use in various environments, the importance of mitigating such vulnerabilities cannot be overstated. Organizations should prioritize patching immediately to prevent potential disruptions.
As of now, no public exploit has been confirmed, and the vulnerability is not included in the Known Exploited Vulnerabilities (KEV) catalog. However, as with all vulnerabilities, organizations should remain vigilant and prepare for potential future exploits.
Vulnerability Details
The official description of this vulnerability states that it allows for incomplete data exchange handling in the Linux kernel's nfc: nci subsystem. Specifically, in the nci_close_device() function, pending data exchanges may not be finalized, leading to socket reference leaks. This vulnerability has been assigned a CVSS score of 5.5, indicating its medium severity level.
The affected product is the Linux kernel, specifically versions from 3.2.1 up to but not including 6.12.82, along with versions 6.13 to 6.18.17, and 6.19 to 6.19.7. The description of the vulnerability highlights that the incomplete exchange can lead to resource exhaustion, affecting system availability.
Technical Analysis
The root cause of this vulnerability is the failure to complete pending data exchanges in the nci_close_device() function. When closing a device, the method does not ensure that outstanding data exchanges are finalized, leading to potential resource leaks. This issue is characterized by low attack complexity and requires low privileges for exploitation.
The attack vector is local, meaning that an attacker must have local access to the device to exploit this vulnerability. User interaction is not required, making it easier to exploit. The implications include a high impact on availability due to the potential for resource exhaustion.
Risk & Impact Analysis
The real-world deployment risk associated with this vulnerability is notable, especially for systems relying on the Linux kernel for critical operations. Organizations utilizing vulnerable versions may face service disruptions and instability, impacting their operations and user trust.
The potential blast radius of this vulnerability is significant, given the widespread use of the Linux kernel across various platforms and environments. Organizations should assess their exposure and prioritize remediation efforts based on the impact this vulnerability could have on their infrastructure.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of the Linux kernel include:
All versions from 3.2.1 through 6.12.82, 6.13 through 6.18.17, and 6.19 through 6.19.7 are affected, specifically including the release candidates for version 7.0.
Mitigation & Remediation
To mitigate the risks associated with this vulnerability, organizations should apply the necessary patches released by the Linux community. It is essential to upgrade to the latest stable version of the Linux kernel that addresses this issue.
If a patch is unavailable, organizations should consider implementing configuration hardening practices and monitoring to detect unreferenced objects or socket leaks. Implementing stringent network controls to limit access to the kernel can also help in mitigating risks.
For further insights on securing systems, organizations can reference our penetration testing services that help identify similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for signs of abnormal behavior related to socket creation and closure. Identifying patterns that deviate from normal operations can help detect potential exploitation attempts.
System changes should also be tracked, especially those involving the nfc: nci subsystem, to ensure that any unauthorized modifications are detected promptly.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of diligent patch management and proactive security practices within organizations. The potential for resource leaks in widely-used components like the Linux kernel underscores the need for continuous monitoring and improvement of security postures.
As organizations adapt to evolving threats, maintaining a robust vulnerability management program becomes essential. For insights on building effective programs, refer to our guide on vulnerability management best practices.
Additionally, organizations should keep abreast of trends in vulnerability exposure and mitigation strategies, as discussed in our article on vulnerability exposure trends to enhance their defensive strategies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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