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CVE-2025-22866: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec
Description
Due to the usage of a variable time instruction in the assembly implementation of an internal function, a small number of bits of secret scalars are leaked on the ppc64le architecture. Due to the way this function is used, we do not believe this leakage is enough to allow recovery of the private key when P-256 is used in any well known protocols.
Classification
CVE ID: CVE-2025-22866
Affected Products
Vendor: Go standard library
Product: crypto/internal/nistec
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 18.35% (scored less or equal to compared to others)
EPSS Date: 2025-03-07 (when was this score calculated)
References
https://go.dev/cl/643735https://go.dev/issue/71383
https://groups.google.com/g/golang-announce/c/xU1ZCHUZw3k
https://pkg.go.dev/vuln/GO-2025-3447