CVE-2026-21942 is a medium-severity vulnerability affecting the Oracle Solaris product of Oracle Systems. Specifically, this vulnerability is found in the Filesystems component and impacts supported versions 10 and 11. The CVSS 3.1 base score for this vulnerability is 5.0, indicating moderate risk due to availability impacts. Organizations utilizing Oracle Solaris should be aware of this vulnerability, as it allows an attacker with low privileges to execute attacks that can cause significant disruptions.
Successful exploitation requires human interaction from a person other than the attacker, which poses additional challenges for organizations. However, the potential for a complete Denial of Service (DoS) remains a serious concern. As the vulnerability is easily exploitable, organizations should prioritize patching to mitigate any risks.
Understanding the urgency of addressing CVE-2026-21942 is crucial for maintaining operational integrity. Organizations that do not act promptly could face service interruptions that affect their overall performance and reliability.
The vulnerability was publicly disclosed on January 20, 2026, and is currently classified under CWE-400, which refers to the 'Uncontrolled Resource Consumption' weakness. Organizations using affected versions should take immediate steps to assess their environments and apply necessary patches.
Vulnerability Details
The official CVE description states that this vulnerability allows a low-privileged attacker with logon access to the infrastructure where Oracle Solaris executes to compromise the system. The attack vector is local, meaning that an attacker must have some access to the system in question. The attack complexity is rated as low, and the attacker requires low privileges, coupled with user interaction to successfully execute an attack.
The CVSS vector for this vulnerability is (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H), emphasizing that while there is no impact on confidentiality or integrity, the availability impact is high. Organizations should note that the vulnerability was identified in versions 10 and 11 of Oracle Solaris.
Technical Analysis
The root cause of CVE-2026-21942 stems from inadequate resource management within the Oracle Solaris Filesystems component. Attackers may leverage this vulnerability to exhaust system resources, leading to a denial of service. The attack vector is local, meaning attackers need to have access to the local infrastructure.
Given the low attack complexity, this vulnerability poses a significant risk, especially since it requires only low privileges and user interaction to exploit. The consequence of a successful attack could lead to a complete system hang or a frequently repeatable crash, resulting in significant downtime.
Risk & Impact Analysis
The potential impact of this vulnerability on organizations is substantial, particularly for those heavily reliant on Oracle Solaris for critical operations. The risk includes not only operational disruptions but also potential breaches in service level agreements, affecting overall customer satisfaction and trust.
Given its classification as a medium-severity vulnerability, organizations should address this issue in their priority patch cycle. The urgency for remediation is underscored by the availability impact highlighted in the CVSS score. Organizations must consider the blast radius of this vulnerability, as an exploited system could lead to cascading failures across interconnected services.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of Oracle Solaris are 10 and 11. Organizations should ensure they are running the latest patched version to mitigate the risk associated with this vulnerability. If specific version information is not available, it is recommended to state: 'All versions prior to vendor patch.'
Mitigation & Remediation
To remediate CVE-2026-21942, organizations should apply patches provided by Oracle as soon as they are available. The vendor has indicated that the required updates are included in their Critical Patch Update Advisory for January 2026. Organizations should prioritize this update to ensure their systems are protected against potential attacks, and consider implementing additional security measures such as configuration hardening and network controls.
For ongoing security validation, organizations may consider engaging in penetration testing to assess for similar vulnerabilities in their environment.
Detection Guidance
Monitoring for unusual resource consumption patterns and system crashes can help identify potential exploitation attempts related to CVE-2026-21942. Organizations should maintain detailed logs to capture system behavior before and after crashes, as well as any anomalies that may indicate an attempted exploit.
AppSecure Threat Intelligence Insight
The emergence of CVE-2026-21942 highlights ongoing concerns regarding the security of operating systems like Oracle Solaris. Security teams should note the importance of continuous monitoring and regular updates to mitigate vulnerabilities effectively. Additionally, organizations may benefit from reviewing their security posture to identify gaps that could lead to similar issues.
For further insights into vulnerability management best practices, organizations can refer to our guide on designing an effective vulnerability management program. Additionally, teams can explore penetration testing methodology to enhance their security testing processes. Finally, reviewing trends in vulnerability exposure can provide additional context for understanding the evolving threat landscape.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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