CVE-2026-29647
OpenXiangShan NEMU Smstateen Permission Enforcement Vulnerability (Information Disclosure/Privilege Escalation)
Description
In OpenXiangShan NEMU, insufficient Smstateen permission enforcement allows lower-privileged code to access IMSIC state via stopei/vstopei CSRs even when mstateen0.IMSIC is cleared, potentially enabling cross-context information leakage or disruption of interrupt handling.
INFO
Published Date :
April 20, 2026, 9:16 p.m.
Last Modified :
April 20, 2026, 9:16 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-29647
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update OpenXiangShan NEMU to the latest version.
- Review and enforce Smstateen permission checks.
- Test for unauthorized IMSIC state access.
- Validate interrupt handling after applying fixes.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-29647.
| URL | Resource |
|---|---|
| https://docs.riscv.org/reference/isa/priv/smstateen.html#state-enable-0-registers | |
| https://github.com/OpenXiangShan/NEMU/issues/691 | |
| https://github.com/OpenXiangShan/XiangShan/pull/3978 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-29647 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-29647
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-29647 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-29647 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Apr. 20, 2026
Action Type Old Value New Value Added Description In OpenXiangShan NEMU, insufficient Smstateen permission enforcement allows lower-privileged code to access IMSIC state via stopei/vstopei CSRs even when mstateen0.IMSIC is cleared, potentially enabling cross-context information leakage or disruption of interrupt handling. Added Reference https://docs.riscv.org/reference/isa/priv/smstateen.html#state-enable-0-registers Added Reference https://github.com/OpenXiangShan/NEMU/issues/691 Added Reference https://github.com/OpenXiangShan/XiangShan/pull/3978