CVE-2025-63384
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-10

Last updated on: 2026-02-05

Assigner: MITRE

Description
A vulnerability was discovered in RISC-V Rocket-Chip v1.6 and before implementation where the SRET (Supervisor-mode Exception Return) instruction fails to correctly transition the processor's privilege level. Instead of downgrading from Machine-mode (M-mode) to Supervisor-mode (S-mode) as specified by the sstatus.SPP bit, the processor incorrectly remains in M-mode, leading to a critical privilege retention vulnerability.
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Meta Information
Published
2025-11-10
Last Modified
2026-02-05
Generated
2026-06-16
AI Q&A
2025-11-10
EPSS Evaluated
2026-06-15
NVD
CVE-2025-63384
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
chipsalliance rocketchip to 1.6 (exc)
risc-v rocket-chip 1.6
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-266 A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.
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Executive Summary

This vulnerability exists in RISC-V Rocket-Chip v1.6 and earlier, where the SRET (Supervisor-mode Exception Return) instruction does not correctly change the processor's privilege level from Machine-mode (M-mode) to Supervisor-mode (S-mode) as intended. Instead, the processor remains in the higher privilege M-mode, causing a critical privilege retention issue.

Impact Analysis

The vulnerability can lead to unauthorized retention of high-level privileges (Machine-mode) when the system should have downgraded to a lower privilege level (Supervisor-mode). This can allow malicious code or attackers to maintain elevated privileges, potentially leading to unauthorized access, control over the system, or bypassing security mechanisms.

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