CVE-2025-56301

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2025-09-30. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in Chipsalliance Rocket-Chip commit f517abbf41abb65cea37421d3559f9739efd00a9 (2025-01-29) allowing attackers to corrupt exception handling and privilege state transitions via a flawed interaction between exception handling and MRET return mechanisms in the CSR logic when an exception is triggered during MRET execution. The Control and Status Register (CSR) logic has a flawed interaction between exception handling and exception return (MRET) mechanisms which can cause faulty trap behavior. When the MRET instruction is executed in machine mode without being in an exception state, an Instruction Access Fault may be triggered. This results in both the exception handling logic and the exception return logic activating simultaneously, leading to conflicting updates to the control and status registers.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
45.0%
KEV
Not listed

Published

September 30, 2025

Last Modified

October 17, 2025

References (5)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:08 UTCEPSS rescore
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  14. 2026-07-13 22:29 UTCEPSS rescore
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  1. 2026-07-06 02:23 UTCEPSS rescore
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  5. 2026-07-01 15:06 UTCEPSS rescore
  6. 2026-06-30 23:22 UTCEPSS rescore
  7. 2026-06-29 14:06 UTCEPSS rescore
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  9. 2026-06-28 14:07 UTCEPSS rescore
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  11. 2026-06-28 04:55 UTCEPSS rescore
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  17. 2026-06-23 21:32 UTCEPSS rescore
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  23. 2026-06-19 19:25 UTCEPSS rescore
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  25. 2026-06-18 17:52 UTCEPSS rescore
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  27. 2026-06-17 17:52 UTCEPSS rescore
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  30. 2026-06-15 17:48 UTCEPSS rescore
  31. 2026-06-14 23:17 UTCEPSS rescore
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  36. 2026-06-10 22:18 UTCEPSS rescore
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  40. 2026-06-08 14:16 UTCEPSS rescore
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  42. 2026-06-07 15:24 UTCEPSS rescore
  43. 2026-06-07 15:24 UTCEPSS rescore
  44. 2026-06-06 13:47 UTCEPSS rescore
  45. 2026-06-06 13:47 UTCEPSS rescore
  46. 2026-06-05 22:46 UTCEPSS rescore
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  48. 2026-06-05 06:10 UTCEPSS rescore
  49. 2026-06-05 06:10 UTCEPSS rescore
  50. 2026-06-02 20:12 UTCEPSS rescore
  51. 2026-06-02 20:12 UTCEPSS rescore
  52. 2026-06-01 13:51 UTCEPSS rescore
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  54. 2026-05-31 22:30 UTCEPSS rescore
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  56. 2026-05-31 00:16 UTCEPSS rescore
  57. 2026-05-31 00:16 UTCEPSS rescore
  58. 2026-05-29 21:52 UTCEG score recompute
  59. 2026-05-29 21:52 UTCGHSA enrichment
  60. 2026-05-29 13:44 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-56301?
CVE-2025-56301 is a high vulnerability published on September 30, 2025. An issue was discovered in Chipsalliance Rocket-Chip commit f517abbf41abb65cea37421d3559f9739efd00a9 (2025-01-29) allowing attackers to corrupt exception handling and privilege state transitions via a flawed interaction between exception handling and MRET return mechanisms in the CSR logic when an…
When was CVE-2025-56301 disclosed?
CVE-2025-56301 was first published in the National Vulnerability Database on September 30, 2025, with the most recent update on October 17, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-56301 actively exploited?
CVE-2025-56301 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-56301?
CVE-2025-56301 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2025-56301?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-56301, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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