OpenXiangShan edb1dfaf7d290ae99724594507dc46c2c2125384 CSR Subsystem denial of service

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenXiangShan XiangShan edb1dfaf7d290ae99724594507dc46c2c2125384. This issue affects some unknown processing of the component CSR Subsystem. The manipulation leads to denial of service. This vulnerability is listed as CVE-2026-29643. The attack must be carried out locally. There is no available exploit. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in OpenXiangShan XiangShan edb1dfaf7d290ae99724594507dc46c2c2125384. This issue affects an unknown functionality of the component CSR Subsystem. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-29643 since 03/04/2026. The exploitation is known to be easy. An attack has to be approached locally. Neither technical details nor an exploit are publicly available.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• OpenXiangShan

Name

• XiangShan

Version

• edb1dfaf7d290ae99724594507dc46c2c2125384

Website

• Product: https://github.com/OpenXiangShan/XiangShan/

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