Integer Overflow or Wraparound Affecting virtio-win package, versions *


Severity

Recommended
0.0
high
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
0.18% (7th percentile)

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  • Snyk IDSNYK-CENTOS9-VIRTIOWIN-17359192
  • published17 Jun 2026
  • disclosed16 Jun 2026

Introduced: 16 Jun 2026

CVE-2026-46655  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

There is no fixed version for Centos:9 virtio-win.

NVD Description

Note: Versions mentioned in the description apply only to the upstream virtio-win package and not the virtio-win package as distributed by Centos. See How to fix? for Centos:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1