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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.
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Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "virtio-win",
"product": "kvm-guest-drivers-windows",
"versions": [
{
"version": ">= mm210, < mm320",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON