# CVE-2026-91254: Oracle Solaris Kernel denial of service

Source: https://junglewise.ai/threats/cve-2026-91254-vulnerability-in-the-oracle-solaris-product-of-oracle-systems  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-91254 · Severity: high · CVSS 7.5 · Published 2026-10-20

Oracle Solaris is an operating system that manages core computing infrastructure. An unauthenticated attacker can remotely crash the system through the network, causing complete service outages. This vulnerability requires no user interaction and can be triggered easily by anyone on the network.

Technologies: [Oracle Solaris](https://junglewise.ai/threats/technologies/solaris). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-91254 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91254 being exploited in the wild.

**How severe is CVE-2026-91254?** High severity, with a CVSS score of 7.5, published 20 October 2026.

**Which products and versions are affected?** Oracle Solaris 11.4.

**Is there a fix for CVE-2026-91254?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-91254 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-91254?** Check whether you run Oracle Solaris at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A network-accessible denial-of-service vulnerability in the Solaris Kernel allows unauthenticated attackers to cause a hang or repeatable crash of the system. The vulnerability is exploitable over HTTP with no privileges or user interaction required. Successful exploitation results in complete unavailability of the affected Solaris system.

## Affected products

- Oracle Solaris 11.4

## Timeline

- 2026-10-20: disclosed

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

## Related threats

- [Oracle Solaris privilege escalation in utility component](https://junglewise.ai/threats/cve-2026-91537-vulnerability-in-the-oracle-solaris-product-of-oracle-systems)
- [Oracle Solaris privilege escalation in Utility component](https://junglewise.ai/threats/cve-2026-91348-vulnerability-in-the-oracle-solaris-product-of-oracle-systems)
- [Oracle Solaris privilege escalation in Utility component](https://junglewise.ai/threats/cve-2026-91336-vulnerability-in-the-oracle-solaris-product-of-oracle-systems)
- [Oracle Solaris denial of service in Libraries component](https://junglewise.ai/threats/cve-2026-91324-vulnerability-in-the-oracle-solaris-product-of-oracle-systems)
- [Oracle Solaris Services denial of service and information disclosure](https://junglewise.ai/threats/cve-2026-91256-vulnerability-in-the-oracle-solaris-product-of-oracle-systems)