CVE-2026-91324 in Solaris
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Solaris product of Oracle Systems (component: Libraries). 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 require human interaction from a person other than the attacker. 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 4.7 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/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 Libraries component of Oracle Solaris version 11.4, representing a significant availability risk for systems relying on this operating environment. The core technical flaw is characterized by its difficulty to exploit and specific prerequisites that limit the scope of potential attackers. Specifically, an unauthenticated attacker must first establish logon access to the infrastructure where Oracle Solaris is executing. This requirement implies that the vulnerability does not stem from a remote network-based attack vector but rather requires local or authenticated proximity to the target system. Furthermore, the exploitation process necessitates human interaction from a party other than the initial attacker, suggesting that social engineering or physical access manipulation may be involved in triggering the malicious code path within the library functions.
From a technical perspective, this vulnerability aligns with CWE-20 Improper Input Validation and potentially CWE-400 Uncontrolled Resource Consumption if the flaw leads to resource exhaustion causing system instability. The impact of successful exploitation is strictly limited to availability, as indicated by the CVSS 3.1 vector components C:N (Confidentiality) and I:N (Integrity). A successful attack results in a hang or a frequently repeatable crash, effectively rendering Oracle Solaris unavailable for legitimate users. This constitutes a complete Denial of Service condition where system resources become unresponsive due to the flawed library operations. The CVSS Base Score of 4.7 reflects this medium-severity impact on availability without compromising data integrity or confidentiality.
The operational impact centers on service disruption rather than data theft or privilege escalation. Organizations running Oracle Solaris 11.4 must recognize that while an attacker cannot directly steal data or modify system configurations through this specific flaw, they can disrupt critical services hosted on the affected infrastructure. The requirement for human interaction adds a layer of complexity to exploitation, making automated remote attacks unlikely but increasing risk in environments where users may be tricked into executing malicious scripts or opening compromised files that trigger the vulnerable library functions. This scenario is consistent with ATT&CK technique T1496 Resource Hijacking if viewed through the lens of resource exhaustion, although it more closely resembles a local denial-of-service event triggered by application-level flaws rather than crypto-mining activities.
Mitigation strategies should prioritize patch management and access control hardening. Oracle has likely released patches addressing this library vulnerability in subsequent updates for Solaris 11.4; therefore, applying the latest security advisories is the primary remediation step. Additionally, since exploitation requires logon access, enforcing strict authentication policies and limiting user privileges can reduce the attack surface. Implementing robust input validation within custom applications that utilize these libraries may also mitigate risk if patches are delayed. Monitoring for unusual system hangs or repeated crashes could serve as an early detection mechanism for attempted exploits in production environments where patching is not immediately feasible.