CVE-2020-24718

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-09-25 · updated 2026-06-17
Weakness: CWE-862

Description

bhyve, as used in FreeBSD through 12.1 and illumos (e.g., OmniOS CE through r151034 and OpenIndiana through Hipster 2020.04), does not properly restrict VMCS and VMCB read/write operations, as demonstrated by a root user in a container on an Intel system, who can gain privileges by modifying VMCS_HOST_RIP.

Affected products

FreeBSD: through 11.2; 11.3, 11.3-p1, 11.3-p10, 11.3-p11, 11.3-p12, 11.3-p13 (+39)
Clustered Data ONTAP: all versions
Omniosce Omnios: through r151034
Openindiana: through hipster_2020.04

References

https://github.com/illumos/illumos-gate/blob/84971882a96ac0fecd538b02208054a872ff8af3/usr/src/uts/i86pc/io/vmm/intel/vmcs.c#L246-L249
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:28.bhyve_vmcs.asc
https://security.netapp.com/advisory/ntap-20201016-0002/
https://github.com/illumos/illumos-gate/blob/84971882a96ac0fecd538b02208054a872ff8af3/usr/src/uts/i86pc/io/vmm/intel/vmcs.c#L246-L249
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:28.bhyve_vmcs.asc
https://security.netapp.com/advisory/ntap-20201016-0002/

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