CVE-2026-91208
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Solaris product of Oracle Systems (component: Services). The supported version that is affected is 11.4. Difficult to exploit vulnerability allows unauthenticated attacker with logon to the infrastructure where Oracle Solaris executes to compromise Oracle Solaris. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Solaris. CVSS 3.1 Base Score 5.1 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Services component of Oracle Solaris version 11.4, representing a significant availability risk for systems relying on this operating system environment. The core technical flaw is characterized by its difficulty to exploit and the specific prerequisites required for an attacker to leverage it effectively. Unlike vulnerabilities that allow remote code execution or privilege escalation from unauthenticated network access, this issue requires the attacker to have valid logon credentials to the infrastructure where Oracle Solaris is executing. This constraint significantly narrows the attack surface, as it necessitates a level of initial trust or prior compromise of user accounts on the target system. The vulnerability manifests when an authenticated but unauthorized actor interacts with specific service functionalities, triggering conditions that lead to severe instability within the operating system kernel or critical service daemons.
From a technical perspective, the flaw results in a complete denial of service condition rather than data exfiltration or integrity violation. Successful exploitation allows an attacker to cause the Oracle Solaris instance to hang or experience frequent, repeatable crashes. This behavior indicates that the vulnerability likely involves improper handling of resources, race conditions, or memory corruption states that are not adequately sanitized before processing by system services. The impact is strictly confined to availability, as confirmed by the CVSS 3.1 base score of 5.1 and the vector AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H. The Low Attack Vector (AV:L) confirms local access requirements, while High Complexity (AC:H) suggests that specific environmental conditions or precise timing are needed to trigger the crash reliably. The absence of impacts on Confidentiality and Integrity underscores that this is a pure availability threat, designed to disrupt service continuity rather than steal data or alter system state persistently.
In terms of industry standard classifications, this vulnerability aligns with CWE-400: Uncontrolled Resource Consumption if the denial of service stems from resource exhaustion such as memory leaks or CPU spikes during specific operations. Alternatively, it may fall under CWE-617: Reachable Assertion if the crash is triggered by a failed internal sanity check within the Solaris services code. From an adversarial tactics perspective, this maps to MITRE ATT&CK technique T1499: Endpoint Denial of Service, specifically focusing on resource exhaustion or service disruption methods that do not require lateral movement beyond local authentication. The requirement for logon access places it in the context of insider threats or compromised user accounts rather than external remote exploitation campaigns.
Mitigation strategies must focus on strict access control and monitoring to prevent unauthorized users from interacting with vulnerable services even if they possess valid credentials. Administrators should enforce principle of least privilege, ensuring that service accounts have minimal permissions necessary for their function. Regular patching is critical; Oracle typically releases errata or patches addressing such stability issues in regular maintenance updates for Solaris 11.4. Additionally, implementing robust logging and monitoring solutions can help detect anomalous behavior patterns indicative of exploitation attempts, such as repeated service restarts or sudden spikes in system load associated with specific user sessions. Network segmentation should also be considered to limit the scope of potential lateral movement if an account is compromised, although this vulnerability specifically requires local access.