# CVE-2026-29643

> Vulnerability · severity: **HIGH** (CVSS 7.1).

## 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.

## Key facts

- **CVE ID:** CVE-2026-29643
- **Published:** 2026-04-20
- **CVSS severity:** HIGH
- **CVSS base score:** 7.1
- **CWE codes:** CWE-703

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29643

## Citation

> AI Analytics. CVE-2026-29643. Retrieved 2026-07-07 from https://api.ai-analytics.org/cve/CVE-2026-29643. Derived from NIST NVD. Licensed CC0.

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