In the Linux kernel, a medium-severity vulnerability identified as CVE-2026-23360 has been reported, which impacts the management of admin queues during controller resets. Specifically, the issue arises when nvme_alloc_admin_tag_set() is called, potentially leading to the orphaning of an old queue if it is not properly released. This flaw is a regression introduced by a previous commit, which has been rectified to ensure robust memory management.
The CVSS score for this vulnerability is 5.5, categorized as medium severity. This classification indicates a risk to organizations that may face availability impacts due to this vulnerability being exploited. As such, organizations are urged to prioritize patching efforts.
The urgency for remediation is heightened given that this issue could lead to significant operational disruptions. Organizations running affected versions of the Linux kernel should implement the necessary patches immediately to mitigate this risk.
Currently, no public exploits or proof-of-concept (PoC) code have been reported, which offers a temporary window for organizations to address this vulnerability before it can be actively exploited.
Risk to organizations includes potential availability issues due to the improper management of admin queues, which could lead to system instability.
Vulnerability Details
The vulnerability allows for an admin queue leak during a controller reset in the Linux kernel. The specific fix addresses the proper release of the previous admin queue before allocating a new one to prevent the orphaning of the old queue.
The vulnerability has been assigned a CVSS score of 5.5, which indicates a medium severity level. The attack vector is local, with low complexity and low privileges required. Importantly, there is no user interaction needed for this vulnerability to be exploited, and it has a high availability impact.
The following configurations are affected: Linux kernel versions between 6.6.120 and 6.6.131, 6.12.62 to 6.12.77, 6.17.12 to 6.18, 6.18.1 to 6.18.17, and 6.19 to 6.19.7. Additionally, specific versions 6.1.167, 7.0:rc1, and 7.0:rc2 are also vulnerable.
Technical Analysis
The root cause of this vulnerability lies in the improper management of admin queues during controller resets. When the function nvme_alloc_admin_tag_set() is invoked, it may not adequately release resources from a previous instance, leading to potential memory leaks.
The attack vector is classified as local, meaning that an attacker must have access to the local system to exploit this vulnerability. The complexity of the attack is low, as it requires minimal effort to trigger the issue once access is obtained.
Privileges required are low, indicating that an attacker does not need extensive permissions to exploit this vulnerability. Furthermore, no user interaction is required, making it easier for an attacker to leverage this weakness.
The impact on confidentiality and integrity is assessed as none, while the availability impact is rated high, meaning that successful exploitation could lead to significant disruption of services.
Risk & Impact Analysis
Organizations utilizing affected versions of the Linux kernel face considerable risk, particularly regarding service availability. The potential for a memory leak during controller resets could lead to system failures or crashes.
The urgency for remediation is classified as medium. Organizations should address this vulnerability within their priority patch cycle, given the potential for high availability impact.
As there are currently no known exploits or public proof of concepts, organizations have a limited timeframe to mitigate this risk before it can be actively exploited.
Organizations should monitor their systems closely for any anomalies that might indicate exploitation attempts. Implementing robust logging and alerting mechanisms will be crucial in detecting and responding to any security incidents stemming from this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following Linux kernel versions are affected by this vulnerability: 6.6.120 to 6.6.131, 6.12.62 to 6.12.77, 6.17.12 to 6.18, 6.18.1 to 6.18.17, and 6.19 to 6.19.7. Additionally, specific versions 6.1.167, 7.0:rc1, and 7.0:rc2 are also vulnerable.
Mitigation & Remediation
Organizations should prioritize applying patches to the affected Linux kernel versions. The following patches are available for remediation:
For detailed guidance on securing your systems, organizations can refer to the penetration testing methodology as part of their security strategy.
Detection Guidance
To monitor for potential exploitation of this vulnerability, organizations should implement logging mechanisms that capture system behavior during controller resets. Anomalies in admin queue management should be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-23360 lies in its representation of how system-level vulnerabilities can lead to broader operational risks. Security teams should be aware of patterns that emerge from such vulnerabilities to bolster their defenses.
For enhanced security posture, organizations are encouraged to adopt comprehensive security practices. Utilizing resources such as the web application penetration testing guide can provide further insights into securing applications against similar vulnerabilities.
Lastly, fostering a culture of security awareness within organizations can significantly reduce vulnerabilities. Regular training on best practices and incident response can help teams better prepare for potential threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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