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CVE-2026-46655— virtio-win: Integer overflow causing a heap overflow in Viosock driver

Quick assessment

Affected
virtio-win kvm-guest-drivers-windows
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

virtio-win provides Windows paravirtualized drivers for QEMU and KVM. From mm210 until mm320, the Viosock driver permits a low-privilege local process to submit an IOCTL_SELECT request with attacker-controlled VIRTIO_VSOCK_SELECT.Fdss[*].fd_count values that o

CVSS 7.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
virtio-win kvm-guest-drivers-windows >= mm210, < mm320 affected
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I. Basic Information for CVE-2026-46655

Vulnerability Information

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Vulnerability Title
virtio-win: Integer overflow causing a heap overflow in Viosock driver
Source: CVE Program / CVE List V5
Vulnerability Description
virtio-win provides Windows paravirtualized drivers for QEMU and KVM. From mm210 until mm320, the Viosock driver permits a low-privilege local process to submit an IOCTL_SELECT request with attacker-controlled VIRTIO_VSOCK_SELECT.Fdss[*].fd_count values that overflow the 32-bit sum used by VIOSockSelect for bounds checking. The wrapped sum can pass the FD_SETSIZE check even though an individual descriptor count is much larger than the expected limit. VIOSockSelectCopyFds then iterates using the unchecked count and writes beyond the allocated pPkt->Fds array in the NonPagedPool kernel heap. Successful exploitation can corrupt kernel memory and enable privilege escalation in a Windows guest running the driver. This issue is fixed in mm320.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
virtio-win kvm-guest-drivers-windows >= mm210, < mm320 -

II. Public POCs for CVE-2026-46655

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III. Intelligence Information for CVE-2026-46655

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Patches & Fixes for CVE-2026-46655 (2)

Other References for CVE-2026-46655 (2)

IV. Related Vulnerabilities

Same weakness: CWE-122

V. Comments for CVE-2026-46655

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