XiangShan (Open-source high-performance RISC-V processor) commit edb1dfaf7d290ae99724594507dc46c2c2125384 (2024-11-28) contains an improper exceptional-condition handling flaw in its CSR subsystem (NewCSR). On affected versions, certain sequences of CSR operations targeting non-existent/custom CSR addresses may trigger an illegal-instruction exception but fail to reliably transfer control to the configured trap handler (mtvec), causing control-flow disruption and potentially leaving the core in a hung or unrecoverable state. This can be exploited by a local attacker able to execute code on the processor to cause a denial of service and potentially inconsistent architectural state.
History

Wed, 22 Apr 2026 04:00:00 +0000

Type Values Removed Values Added
Title Improper Exception Handling in XiangShan CSR Subsystem Allows Local Denial of Service

Wed, 22 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-703
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 20 Apr 2026 22:45:00 +0000

Type Values Removed Values Added
First Time appeared Openxiangshan
Openxiangshan xiangshan
Vendors & Products Openxiangshan
Openxiangshan xiangshan

Mon, 20 Apr 2026 21:45:00 +0000

Type Values Removed Values Added
Description XiangShan (Open-source high-performance RISC-V processor) commit edb1dfaf7d290ae99724594507dc46c2c2125384 (2024-11-28) contains an improper exceptional-condition handling flaw in its CSR subsystem (NewCSR). On affected versions, certain sequences of CSR operations targeting non-existent/custom CSR addresses may trigger an illegal-instruction exception but fail to reliably transfer control to the configured trap handler (mtvec), causing control-flow disruption and potentially leaving the core in a hung or unrecoverable state. This can be exploited by a local attacker able to execute code on the processor to cause a denial of service and potentially inconsistent architectural state.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-04-20T00:00:00.000Z

Updated: 2026-04-21T19:50:32.463Z

Reserved: 2026-03-04T00:00:00.000Z

Link: CVE-2026-29643

cve-icon Vulnrichment

Updated: 2026-04-21T19:17:00.415Z

cve-icon NVD

Status : Deferred

Published: 2026-04-20T22:16:23.507

Modified: 2026-04-21T20:16:40.223

Link: CVE-2026-29643

cve-icon Redhat

No data.