CVE-2026-29647 Missing authorization in n/a
Lower-privileged code can access IMSIC state via CSRs despite permission restrictions, enabling information leakage or interrupt handling disruption in OpenXiangShan NEMU.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-29647?
CVE-2026-29647 is a medium-severity missing authorization vulnerability in n/a, published on 20 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-269
Which versions are affected by CVE-2026-29647?
How do I fix CVE-2026-29647?
No fix has been published for CVE-2026-29647 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-29647 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29647 exists.
Sources
Also known as GHSA-8w4w-q822-g7ph.