CVE-2025-51060: An issue was discovered in CPUID cpuz.sys 1.0.5.4

This week

MEDIUM 6.5REMOTEDOWNGRADE

CVE-2025-51060 is a medium-severity flaw (CVSS 6.5) affecting cpuz.sys. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in CPUID cpuz.sys 1.0.5.4. An attacker can use DeviceIoControl with the unvalidated parameters 0x9C402440 and 0x9C402444 as IoControlCodes to perform RDMSR and WRMSR, respectively. Through this process, the attacker can modify MSR_LSTAR and hook KiSystemCall64. Afterward, using Return-Oriented Programming (ROP), the attacker can manipulate the stack with pre-prepared gadgets, disable the SMAP flag in the CR4 register, and

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-284
Published	2025-08-05
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: cpuid

Last updated 2026-07-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-05 18:15 UTCPublished CVE record published
2026-07-05 16:19 UTCUpdated Record last modified

cpuid cpuz.sys DOWNGRADE

Affected: 1.0.5.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.5.4

1. Check installed version

apt-cache policy cpuz.sys || rpm -q cpuz.sys || cpuz.sys --version

2. No fixed release: DOWNGRADE to a release before 1.0.5.4 (Debian / Ubuntu)

apt-cache madison cpuz.sys sudo apt install cpuz.sys=<VERSION_BEFORE_1.0.5.4> sudo apt-mark hold cpuz.sys

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cpuz.sys sudo dnf downgrade cpuz.sys-<VERSION_BEFORE_1.0.5.4> sudo dnf versionlock add cpuz.sys

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-51060?

cpuz.sys: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-51060 being exploited?

CVE-2025-51060 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-51060 affect?

CVE-2025-51060 affects cpuz.sys. Severity is medium (CVSS 6.5). An issue was discovered in CPUID cpuz.sys 1.0.5.4. An attacker can use DeviceIoControl with the unvalidated parameters 0x9C402440 and 0x9C402444 as IoControlCodes to perform RDMSR and WRMSR, respectively. Through this process, the attacker

How urgent is CVE-2025-51060?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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