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Vulnerability record · CVE-2026-29643 · published 20 April 2026

CVE-2026-29643: XiangShan (Open-source high-performance RISC-V processor) commit edb1dfaf7d290ae99724594507dc46c2c2125384 (202…

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.

7.1 CVSS 3.1 High EPSS 0.17% · top 94.1% CWE-703 · CWE-703 Deferred
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

References

LinkTags
https://docs.riscv.org/reference/isa/priv/machine.html
https://docs.riscv.org/reference/isa/priv/priv-csrs.html
https://github.com/OpenXiangShan/XiangShan/issues/3959
https://github.com/OpenXiangShan/XiangShan/pull/3966
https://github.com/OpenXiangShan/XiangShan/issues/3959

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Source: NIST National Vulnerability Database (record CVE-2026-29643), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.