CVE-2026-80115
CVE-2026-80115 is a medium-severity vulnerability with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-782.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v4: 6.9
- EPSS exploit prediction: 0% (4th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-782
- Published:
- Last modified:
Description
PassMark PerformanceTest before 11.1 build 1012, BurnInTest before 11.1 build 1000, and OSForensics before 11.1 build 1016 contain a privilege escalation and denial-of-service vulnerability in DirectIo64.sys that allows local attackers to read arbitrary Model-Specific Registers or write zero to any MSR through exposed IOCTLs with insufficient blocklist enforcement. Attackers can exploit the unrestricted write IOCTL to zero out the system call handler MSR, causing an immediate unrecoverable kernel crash on the next system call, or read security-sensitive MSRs used to locate kernel data structures.
Frequently asked questions
- What is CVE-2026-80115?
- PassMark PerformanceTest before 11.1 build 1012, BurnInTest before 11.1 build 1000, and OSForensics before 11.1 build 1016 contain a privilege escalation and denial-of-service vulnerability in DirectIo64.sys that allows local attackers to read arbitrary Model-Specific Registers or write zero to any MSR through exposed IOCTLs with insufficient blocklist enforcement. Attackers can exploit the unrestricted write IOCTL to zero out the system call handler MSR, causing an immediate unrecoverable kernel crash on the next system call, or read security-sensitive MSRs used to locate kernel data structures.
- How severe is CVE-2026-80115?
- CVE-2026-80115 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
- Is CVE-2026-80115 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-80115?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2026-80115 published?
- CVE-2026-80115 was published on 2026-09-04 and last updated on 2026-09-14.
References
- https://dkom.dev/posts/directio64-disclosure/
- https://github.com/floppywiggler/directio64-disclosure
- https://www.osforensics.com/whats-new.html
- https://www.passmark.com/products/burnintest/history.php
- https://www.passmark.com/products/performancetest/history.php
- https://www.vulncheck.com/advisories/passmark-performancetest-burnintest-and-osforensics-kernel-crash-via-directio64-sys-msr-write-ioctl
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