CVE-2026-46914 Overview
CVE-2026-46914 is a local privilege management vulnerability in the Filesystem component of Oracle Solaris 11.4. A low-privileged attacker with logon access to the host running Oracle Solaris can exploit the flaw to gain unauthorized access to critical data and trigger a complete denial of service. The weakness is mapped to [CWE-269] Improper Privilege Management. Oracle disclosed the issue in the June 2026 Critical Patch Update. No public proof-of-concept code or in-the-wild exploitation has been reported at the time of publication.
Critical Impact
A local, authenticated attacker can read all data accessible to Oracle Solaris and force repeatable system crashes, resulting in complete loss of confidentiality and availability on affected hosts.
Affected Products
- Oracle Solaris 11.4
- Oracle Systems — Filesystem component
- Deployments where untrusted local users hold shell or logon access
Discovery Timeline
- 2026-06-17 - CVE-2026-46914 published to NVD
- 2026-06-17 - Oracle published the Critical Patch Update advisory
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-46914
Vulnerability Analysis
The vulnerability resides in the Filesystem subsystem of Oracle Solaris 11.4. Oracle classifies the flaw as easily exploitable and reachable by any user with valid logon credentials on the host. Successful exploitation yields read access to all data accessible to Oracle Solaris and the ability to hang or crash the operating system. The attack does not require user interaction and the scope remains unchanged, meaning the impact is contained within the vulnerable Solaris instance. Integrity is not affected, but confidentiality and availability are both fully compromised on a successful attack path.
Root Cause
The defect is categorized under [CWE-269] Improper Privilege Management. Oracle's advisory indicates the Filesystem component does not correctly enforce privilege boundaries for low-privileged callers. As a result, a local user can reach filesystem operations that should be restricted to higher-privileged contexts. Oracle has not released implementation-level details of the affected code paths beyond the advisory summary.
Attack Vector
Exploitation requires local access with a low-privileged account. The attacker invokes the vulnerable filesystem code path from a standard shell session on the Solaris host. Because no user interaction is required and the attack complexity is low, any interactive or batch user on a shared Solaris system represents a viable threat source. Multi-tenant Solaris environments, jump hosts, and shared developer systems carry the highest exposure. See the Oracle Security Alert for vendor guidance.
Detection Methods for CVE-2026-46914
Indicators of Compromise
- Unexpected kernel panics or system hangs originating from filesystem syscalls on Solaris 11.4 hosts.
- Audit records showing low-privileged users accessing files outside their normal authorization scope.
- Repeated crashes correlated with the same local user session or process lineage.
Detection Strategies
- Enable Solaris Audit (auditd) with the fr, fw, and fa classes to capture filesystem read, write, and attribute events for non-privileged users.
- Baseline normal filesystem access patterns per user and alert on deviations such as reads of /etc/shadow, /var, or other restricted paths from low-privileged accounts.
- Correlate kernel crash dumps in /var/crash with the active user session immediately preceding the panic.
Monitoring Recommendations
- Forward Solaris audit logs and system messages to a centralized analytics platform for cross-host correlation.
- Alert on abnormal volumes of filesystem syscalls from a single low-privileged user within short time windows.
- Track availability metrics for Solaris hosts and flag unplanned reboots or kernel panics for forensic review.
How to Mitigate CVE-2026-46914
Immediate Actions Required
- Apply the June 2026 Oracle Critical Patch Update for Oracle Solaris 11.4 on all affected systems.
- Inventory all Solaris 11.4 hosts and prioritize multi-user systems where untrusted local accounts exist.
- Restrict interactive logon to Solaris hosts to administrative personnel until patches are deployed.
- Review recent audit logs for filesystem access anomalies that could indicate prior exploitation.
Patch Information
Oracle has issued fixes through the June 2026 Critical Patch Update. Administrators should download the appropriate Support Repository Update (SRU) for Solaris 11.4 from My Oracle Support and apply it through pkg update. Validate the patched build with pkg info entire after installation.
Workarounds
- Remove shell access for non-administrative users on Solaris 11.4 hosts until patches are applied.
- Use Solaris Zones or Role-Based Access Control (RBAC) to constrain user privileges and limit reachable filesystem code paths.
- Disable or restrict access to shared services that allow untrusted users to authenticate locally to Solaris.
# Verify current SRU and apply the patched package set
pkg info entire | grep Branch
pkg update --accept
reboot
# Enable filesystem auditing for low-privileged users
auditconfig -setflags fr,fw,fa
auditconfig -setpolicy +argv,arge
audit -s
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
