In the Linux kernel, a medium-severity vulnerability has been identified that allows for improper locking mechanisms in GPIO functions. This vulnerability could lead to significant impacts if not addressed promptly. Organizations relying on affected versions of the Linux kernel should be aware of the potential risks associated with this vulnerability.
The CVSS score for this vulnerability is 5.5, categorized as medium severity. It is crucial to understand that although the base score is moderate, the implications of a successful exploit could lead to high availability impacts, which necessitates immediate attention from security teams.
Risk to organizations includes potential disruptions in service due to improper locking mechanisms. Attackers may leverage this vulnerability to create instability in services relying on kernel-level operations, thereby affecting overall system performance.
Organizations should prioritize patching immediately. The vulnerability has been documented, and patches are available. Security teams should assess their environments for affected systems and apply the necessary updates to mitigate risks.
Vulnerability Details
The vulnerability allows for improper locking in GPIO functions within the Linux kernel. The issue arises when irq_chip functions are called in raw spinlock context, necessitating a transition to raw spinlock for internal locking. This change addresses a bug noted in previous versions of the kernel, specifically related to invalid wait contexts.
The CVSS 3.1 vector string for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating an attack vector of local, low attack complexity, low privileges required, no user interaction, unchanged scope, and a high availability impact.
Affected systems include the Linux kernel versions starting from 5.12 up to but not including 6.6.74, as well as several release candidates of version 6.13. The vulnerability has been classified under CWE-667, indicating a potential issue with improper locking.
Technical Analysis
This vulnerability stems from inadequate locking mechanisms when handling GPIO functions, particularly in the context of raw spinlocks. The kernel's irq_chip functions require a specific locking context to operate safely, and failing to implement raw spinlocks can lead to race conditions and potential system crashes.
The attack vector is local, meaning that an attacker would need access to the system to exploit this vulnerability. The attack complexity is low, as it does not require extensive knowledge or resources to exploit. The attacker needs low privileges to initiate the exploitation, and no user interaction is required.
From a confidentiality and integrity perspective, there is no impact; however, the availability impact is rated high. This means that while sensitive data is not at risk, the reliability of services could be significantly affected.
Risk & Impact Analysis
Organizations utilizing vulnerable versions of the Linux kernel face potential service disruptions, particularly in environments relying heavily on GPIO functionality. The real-world deployment risk is moderate, considering the necessary access for exploitation and the specificity of the attack vector.
The blast radius of this vulnerability is notable. Systems that rely on GPIO functionalities, such as embedded systems or devices interfacing with hardware components, could experience high availability impact, leading to operational downtimes.
Given the CVSS score of 5.5 and absence from the KEV catalog, organizations should treat this vulnerability with medium urgency. It is essential to schedule remediation within the priority patch cycle to prevent potential impacts.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of the Linux kernel include all versions starting from 5.12 up to but not including 6.6.74, and also the release candidates for version 6.13 (rc1 to rc7).
Mitigation & Remediation
Patching is the primary method of remediation. Organizations should update to the latest stable release of the Linux kernel that addresses this vulnerability. In case a patch is not immediately available, temporary workarounds may include limiting access to GPIO functionalities or applying configuration hardening measures.
For those looking to validate the effectiveness of their patching efforts, organizations should consider utilizing continuous penetration testing to ensure that all vulnerabilities have been addressed.
Detection Guidance
Monitoring logs for anomalies related to GPIO operations can provide insights into any issues stemming from this vulnerability. Organizations should also be on the lookout for any irregularities in system performance or behavior, which may indicate exploitation attempts.
AppSecure Threat Intelligence Insight
This vulnerability highlights the ongoing need for robust locking mechanisms in kernel-level programming. It serves as a reminder for organizations to regularly assess their systems for vulnerabilities and implement timely patch management practices.
Security teams are encouraged to stay updated on trends in vulnerability management. For more information on establishing an effective vulnerability management program, organizations can refer to best practices and strategic insights.
Furthermore, understanding the implications of kernel vulnerabilities and their exploitation can be crucial for developing effective defenses against potential threats. For detailed insights, consider reviewing our article on penetration testing methodologies that can aid in identifying and mitigating vulnerabilities.
In conclusion, vigilance is key in managing vulnerabilities such as CVE-2025-21684, and organizations should take proactive steps to safeguard 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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