In the Linux kernel, a vulnerability has been identified regarding the improper use of locking mechanisms. The function adjust_inuse_and_calc_cost() utilizes spin_lock_irq(), allowing interrupts to be enabled upon unlocking. This can lead to a potential deadlock if other locks are held and interrupts are disabled prior to its invocation. The fix involves using spin_lock_irqsave(), which maintains the interrupt request (IRQ) state correctly.
The vulnerability has been classified as having an unknown severity level, but it is critical for organizations to understand that it may lead to operational disruptions. The potential risk includes deadlocks that can arise from improper lock handling, which could affect system performance and reliability.
As of now, this vulnerability is marked as deferred, indicating that it might not be actively exploited in the wild. However, organizations should still remain vigilant and ensure they have monitoring in place to detect any anomalies that may arise from this issue.
Organizations should prioritize patching immediately to mitigate any risks associated with the exploitation of this vulnerability.
Vulnerability Details
The vulnerability description indicates that the issue arises from the use of spin_lock_irq() instead of spin_lock_irqsave(), which can lead to inconsistent lock states. This inconsistency can result in deadlocks if certain conditions are met, particularly when other locks are held.
The official CVE description notes that this vulnerability has been resolved in the Linux kernel, but it is important to understand the underlying technical implications. The locking mechanism is crucial in preventing concurrent access to shared data, and any inconsistencies can lead to significant system issues.
The publication date for this vulnerability was on October 22, 2025, and it is classified under the Linux kernel. Organizations utilizing affected versions should remain alert for updates and ensure they apply patches as they become available.
Technical Analysis
The root cause of the vulnerability is tied to the improper locking mechanism used within the Linux kernel. The adjust_inuse_and_calc_cost() function employs spin_lock_irq(), which can create a scenario where interrupts are re-enabled improperly when unlocking. This leads to a potential deadlock if other locks are held and interrupts are disabled.
The attack vector for this vulnerability is categorized as unknown, which means the specific circumstances under which an attacker could exploit this vulnerability remain unclear. The complexity of the attack is also classified as unknown, implying that the conditions required for exploitation are not fully determined.
In terms of privileges required for exploitation, the specifics are not defined, indicating that further analysis is necessary to understand the potential impact fully. User interaction is not required for this vulnerability, as it involves internal kernel operations.
The impacts on confidentiality, integrity, and availability are not explicitly detailed, but the potential for deadlocks suggests that availability may be the most affected area.
Risk & Impact Analysis
The real-world deployment risk associated with this vulnerability may be relatively low at present, as it is currently marked as deferred and not actively exploited. However, organizations should recognize that any vulnerability that can lead to deadlocks poses a risk to operational stability.
The urgency for organizations to address this issue is moderate. While active exploitation is not confirmed, the potential for operational disruption necessitates monitoring and readiness to patch once updates are released.
The blast radius for this vulnerability may be significant in environments with critical workloads, where a deadlock could halt essential processes. Therefore, organizations should consider the potential impacts on their systems.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Currently, specific versions affected by this vulnerability have not been detailed. Organizations using the Linux kernel are advised to stay updated with vendor patches and monitor for any announcements regarding this issue.
Mitigation & Remediation
Organizations should monitor the Linux kernel for any patches related to this vulnerability. In the absence of immediate patches, it is advisable to implement workarounds that may include adjusting lock usage patterns in critical systems.
Detection Guidance
Monitoring log indicators for unusual deadlock behavior can assist in identifying potential impacts from this vulnerability. Behavioral anomalies in system performance may also serve as indicators.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential impact on system stability. Although it is currently marked as deferred, the underlying issues with lock management in the Linux kernel may reveal trends in vulnerability development that require attention.
Security teams should learn from this vulnerability to reinforce their understanding of locking mechanisms and develop strategies to prevent similar issues in their systems.
For organizations utilizing the Linux kernel, ongoing vigilance and proactive measures will be essential to mitigate the risks associated with such vulnerabilities. Engage in continuous security assessments and consider implementing continuous security testing to identify and address similar weaknesses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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