Glibc 2.40+ strncmp Vector Reg Overwrite (Power10)
CVE-2025-5745 Published on June 5, 2025
The strncmp implementation optimized for the Power10 processor in the GNU C Library version 2.40 and later writes to vector registers v20 to v31 without saving contents from the caller (those registers are defined as non-volatile registers by the powerpc64le ABI), resulting in overwriting of its contents and potentially altering control flow of the caller, or leaking the input strings to the function to other parts of the program.
Vulnerability Analysis
CVE-2025-5745 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2025-5745. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.
Weakness Type
Improper Initialization
The software does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used. This can have security implications when the associated resource is expected to have certain properties or values, such as a variable that determines whether a user has been authenticated or not.
Products Associated with CVE-2025-5745
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Affected Versions
The GNU C Library glibc Version 2.40 is affected by CVE-2025-5745Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.