CVE-2026-29643_CVE-2026-29643

7.1 / 10

HIGH

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

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.

Basic Information

ID CVE-2026-29643

Source mitre

Published Apr 20, 2026 at 00:00

Modified Apr 21, 2026 at 19:50

Affected Product

Vendor n/a

Product n/a

Version n/a

Affected Versions n/a n/a n/a

CWE Classification

CWE-703

References

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    "published": "2026-04-20T00:00:00.000Z",
    "modified": "2026-04-21T19:50:32.463Z",
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    "title": "CVE-2026-29643",
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    "references": "https://github.com/OpenXiangShan/XiangShan/issues/3959\nhttps://github.com/OpenXiangShan/XiangShan/pull/3966\nhttps://docs.riscv.org/reference/isa/priv/priv-csrs.html\nhttps://docs.riscv.org/reference/isa/priv/machine.html",
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