CVE-2026-29648
OpenXiangShan NEMU Smstateen Information Disclosure/Privilege Escalation
Description
In OpenXiangShan NEMU, when Smstateen is enabled, clearing mstateen0.ENVCFG does not correctly restrict access to henvcfg and senvcfg. As a result, less-privileged code may read or write these CSRs without the required exception, potentially bypassing intended state-enable based isolation controls in virtualized or multi-privilege environments.
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-2026-29648
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
- Ensure mstateen0.ENVCFG restrictions are properly enforced.
- Verify CSR access controls for henvcfg and senvcfg.
- Test isolation controls in multi-privilege environments.
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-2026-29648.
| URL | Resource |
|---|---|
| https://docs.riscv.org/reference/isa/priv/smstateen.html | |
| https://github.com/OpenXiangShan/NEMU/issues/690 | |
| 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-2026-29648 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-2026-29648
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-2026-29648 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-29648 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, when Smstateen is enabled, clearing mstateen0.ENVCFG does not correctly restrict access to henvcfg and senvcfg. As a result, less-privileged code may read or write these CSRs without the required exception, potentially bypassing intended state-enable based isolation controls in virtualized or multi-privilege environments. Added Reference https://docs.riscv.org/reference/isa/priv/smstateen.html Added Reference https://github.com/OpenXiangShan/NEMU/issues/690 Added Reference https://github.com/OpenXiangShan/XiangShan/pull/3978