PT-2026-33855 · Xiangshan · Xiangshan

Published 2026-04-20 · Updated 2026-04-21 · CVE-2026-29643

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions XiangShan versions prior to commit edb1dfaf7d290ae99724594507dc46c2c2125384

Description An improper exceptional-condition handling flaw exists in the CSR subsystem (NewCSR). Certain sequences of CSR operations targeting non-existent or custom CSR addresses may trigger an illegal-instruction exception but fail to reliably transfer control to the configured trap handler mtvec. This results in control-flow disruption and may leave the core in a hung or unrecoverable state, allowing a local attacker with code execution capabilities to cause a denial of service and potentially an inconsistent architectural state.

Recommendations Update to commit edb1dfaf7d290ae99724594507dc46c2c2125384 or a newer version.

Exploit

Fix

Weakness Enumeration

CWE-703

Related Identifiers

CVE-2026-29643

Affected Products

Xiangshan

References · 6

• 🔥 https://github.com/OpenXiangShan/XiangShan/issues/3959 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-29643 · Security Note
• https://github.com/OpenXiangShan/XiangShan/pull/3966 · Note
• https://twitter.com/CVEnew/status/2046601516463570969 · Twitter Post
• https://docs.riscv.org/reference/isa/priv/machine.html · Note
• https://docs.riscv.org/reference/isa/priv/priv-csrs.html · Note