CVE-2026-46655 virtio-win - Privilege Escalation

virtio-win from mm210 to mm320 contains a buffer overflow in the Viosock driver caused by improper bounds checking of fd_count in IOCTL_SELECT requests, letting low-privilege local attackers escalate privileges in Windows guests, exploit requires local access.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-122

Vendor fix

Update to version mm320 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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