What’s Vulnerable › Vulnerabilities

CVE-2026-29649

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-20 · updated 2026-06-17
• Weakness: CWE-693

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).

Affected products

• Xiangshan Nemu: all versions

References

• https://docs.riscv.org/reference/isa/priv/hypervisor.html
• https://docs.riscv.org/reference/isa/priv/machine.html
• https://github.com/OpenXiangShan/NEMU/issues/681
• https://github.com/OpenXiangShan/NEMU/pull/689

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