CVE-2026-29649 Other in n/a
A flaw in NEMU's RISC-V Hypervisor CSR handling allows machine-mode writes to incorrectly modify hypervisor configuration, potentially causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-29649?
CVE-2026-29649 is a critical vulnerability in n/a, published on 20 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
NEMU contains an implementation flaw in its RISC-V Hypervisor CSR handling where henvcfg[7:4] (CBIE/CBCFE/CBZE-related fields) is incorrectly masked/updated based on menvcfg[7:4], so a machine-mode write to menvcfg can implicitly modify the hypervisor's environment configuration. This can lead to incorrect enforcement of virtualization configuration and may cause unexpected traps or denial of service when executing cache-block management instructions in virtualized contexts (V=1).
Weakness: CWE-693
Which versions are affected by CVE-2026-29649?
It affects 1 product.
Products include Xiangshan Nemu.
How do I fix CVE-2026-29649?
No fix has been published for CVE-2026-29649 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-29649 being exploited?
There is no known exploitation of CVE-2026-29649 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-p786-pp8p-8p3m.