CVE-2026-80115

Kernel crash via unrestricted MSR write IOCTL

Published Sep 4, 2026 · Updated Sep 4, 2026

DirectIo64.sys in PassMark PerformanceTest, BurnInTest, and OSForensics allows local users to read MSRs or crash the Windows kernel. Its read IOCTL rejects only two MSRs, while its zero-write IOCTL applies no blocklist and accepts any caller-supplied MSR index. A low-privileged process must reach a loaded, non-exclusively held driver; reading IA32_GS_BASE exposes a kernel pointer, while zeroing IA32_LSTAR causes an unrecoverable crash on the next system call.

CVSS severity6.9
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DirectIo64.sys in PassMark PerformanceTest, BurnInTest, and OSForensics allows local users to read MSRs or crash the Windows kernel. Its read IOCTL rejects only two MSRs, while its zero-write IOCTL applies no blocklist and accepts any caller-supplied MSR index. A low-privileged process must reach a loaded, non-exclusively held driver; reading IA32_GS_BASE exposes a kernel pointer, while zeroing IA32_LSTAR causes an unrecoverable crash on the next system call.

The record

CVE
CVE-2026-80115
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
PassMark Software
Product
BurnInTest
Classifications
CWE-782, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <11.1 build 1000

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

PassMark Software · BurnInTestversion=0 <11.1 build 1000
PassMark Software · OSForensicsversion=0 <11.1 build 1016
PassMark Software · PerformanceTestversion=0 <11.1 build 1012

Published CVSS scores

6.1VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
6.9VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-782Exposed IOCTL with Insufficient Access Control
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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