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Date	Provider	Score	Summary
13 Aug 2026, 3:42 AM	The Register	4.5	Spectre rears its ugly head again as researchers show some RISC-V chips are susceptible Researchers from Belgian and German academic institutions demonstrated at the 35th Usenix Security Symposium that commercial out-of-order RISC-V processors—specifically SiFive P550 and T-Head Xuantie C910/C920—are vulnerable to all major Spectre variants (PHT, BTB, RSB, STL), achieving up to 100% recall and 97%+ precision in proof-of-concept attacks. In-order RISC-V processors (SiFive U74, Xuantie C906, C908) appear unaffected. Why: If you're evaluating RISC-V silicon for embedded or edge deployments, prefer in-order cores (U74, C906, C908) over out-of-order ones (P550, C910/C920) if Spectre-class side-channel leakage is a threat model concern. The T-Head Xuantie C910/C920 chips are Alibaba's designs and are among the more accessible commercial RISC-V parts in Asia, so builders sourcing from regional distributors should factor in that mitigations are not yet mature compared to the x86/ARM ecosystem. security risc-v hardware side-channel-attacks

Date

Provider

Score

Summary

13 Aug 2026, 3:42 AM

The Register

4.5

Spectre rears its ugly head again as researchers show some RISC-V chips are susceptible

Researchers from Belgian and German academic institutions demonstrated at the 35th Usenix Security Symposium that commercial out-of-order RISC-V processors—specifically SiFive P550 and T-Head Xuantie C910/C920—are vulnerable to all major Spectre variants (PHT, BTB, RSB, STL), achieving up to 100% recall and 97%+ precision in proof-of-concept attacks. In-order RISC-V processors (SiFive U74, Xuantie C906, C908) appear unaffected.

Why: If you're evaluating RISC-V silicon for embedded or edge deployments, prefer in-order cores (U74, C906, C908) over out-of-order ones (P550, C910/C920) if Spectre-class side-channel leakage is a threat model concern. The T-Head Xuantie C910/C920 chips are Alibaba's designs and are among the more accessible commercial RISC-V parts in Asia, so builders sourcing from regional distributors should factor in that mitigations are not yet mature compared to the x86/ARM ecosystem.