Vulnerability in Cpuid Cpuz.sys
CVE-2025-51060
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 execute a user-mode syscall handler in the kernel context. It has not been confirmed whether this works on 32-bit Windows, but it functions on 64-bit Windows if the core isolation feature is either absent or disabled.
EPSS: 0.003 (20.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Cpuid Cpuz.sys — versions 1.0.5.4
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Product)
- cve@mitre.org (Broken Link)
- cve@mitre.org (Exploit)
Frequently asked questions
- What is CVE-2025-51060?
- CVE-2025-51060 is a medium-severity vulnerability in Cpuid Cpuz.sys, classified under Improper Access Control. CVSS score: 6.5/10. Published 2025-08-05.
- How severe is CVE-2025-51060?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2025-51060 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.