CVE-2023-54322: Unknown Severity Vulnerability in Linux Kernel

In the Linux kernel, a vulnerability has been resolved regarding the handling of IRQ entries. This vulnerability allows for unintentional deep call stack entries, especially in KASAN-enabled scenarios, potentially leading to system instability or crashes. As of now, the vulnerability is classified as deferred, which indicates that it may not be actively exploited, but vigilance is still required.

This vulnerability impacts the arm64 architecture, specifically related to the functions that manage IRQ entries in the kernel's call stack. The current implementation of the filter_irq_stacks() function does not accurately handle IRQ entries, causing potential issues in certain configurations. The urgency for organizations depends on their kernel usage and the likelihood of encountering the unresolved issues.

Risk to organizations includes potential system crashes and instability due to the improper handling of IRQ entries in the kernel. Although there is currently no public exploit confirmed, the situation warrants careful monitoring, especially in production environments.

Organizations should prioritize patching immediately if they are utilizing affected versions of the Linux kernel in their infrastructure.

Vulnerability Details

The vulnerability, identified as CVE-2023-54322, is related to the handling of IRQ entries within the Linux kernel. The specific issue arises from the filter_irq_stacks() function, which fails to correctly cut entries associated with IRQ from its call stack. Without the "CONFIG_FUNCTION_GRAPH_TRACER" configuration, the arm64 kernel does not include the entry point of arm64 IRQ within the expected symbols, leading to potential deep call stack entries.

This vulnerability may not have a CVSS score assigned yet, but the implications can lead to severe operational issues if not addressed. The vulnerability was published on December 30, 2025, and is currently classified as deferred.

Technical Analysis

The root cause of this vulnerability is the improper handling of IRQ entries in the call stack due to missing configuration. The attack vector is local, as it requires access to the kernel environment. The attack complexity is low, given the nature of the vulnerability, and it does not require user interaction. The confidentiality, integrity, and availability impacts are significant, as this could lead to system crashes and instability.

Risk & Impact Analysis

Organizations utilizing the Linux kernel should be aware of the potential risks associated with this vulnerability. The improper handling of IRQ entries can lead to unintentional deep call stack entries, which may manifest as system crashes or performance degradation. The urgency for addressing this vulnerability is categorized as low, given the deferred status, but organizations should still prioritize monitoring their systems for any related issues.

Exploitation Status

Affected Versions

Currently, there are no specific versions listed as affected. Organizations should assume all versions prior to any vendor patch might be susceptible.

Mitigation & Remediation

Organizations should monitor for patches regarding this vulnerability once they are available. As of now, no immediate patches have been released. Regular updates and security reviews should be conducted to ensure systems are secure.

Detection Guidance

Organizations should monitor logs for anomalies related to IRQ handling and deep call stack entries. Behavioral anomalies within the kernel could indicate issues related to this vulnerability.

AppSecure Threat Intelligence Insight

This vulnerability underscores the importance of robust security practices within kernel management. Security teams should remain aware of emerging vulnerabilities and the impact they may have on system stability. Continuous education and assessment of kernel configurations can help mitigate risks associated with such vulnerabilities.