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2 vulnerabilities by virtio-win
CVE-2026-46655 (GCVE-0-2026-46655)
Vulnerability from nvd – Published: 2026-09-18 16:46 – Updated: 2026-09-18 16:46
VLAI
EPSS
VEX
Title
virtio-win: Integer overflow causing a heap overflow in Viosock driver
Summary
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.
Severity
7.8 (High)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/virtio-win/kvm-guest-drivers-w… | x_refsource_CONFIRM |
| https://github.com/virtio-win/kvm-guest-drivers-w… | x_refsource_MISC |
| https://github.com/virtio-win/kvm-guest-drivers-w… | x_refsource_MISC |
| https://github.com/virtio-win/kvm-guest-drivers-w… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| virtio-win | kvm-guest-drivers-windows |
Affected:
>= mm210, < mm320
|
{
"containers": {
"cna": {
"affected": [
{
"product": "kvm-guest-drivers-windows",
"vendor": "virtio-win",
"versions": [
{
"status": "affected",
"version": "\u003e= mm210, \u003c mm320"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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-\u003eFds 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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-122",
"description": "CWE-122: Heap-based Buffer Overflow",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-190",
"description": "CWE-190: Integer Overflow or Wraparound",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-18T16:46:50.352Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/virtio-win/kvm-guest-drivers-windows/security/advisories/GHSA-qrhp-4mhp-hjwh",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/virtio-win/kvm-guest-drivers-windows/security/advisories/GHSA-qrhp-4mhp-hjwh"
},
{
"name": "https://github.com/virtio-win/kvm-guest-drivers-windows/pull/1568",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/virtio-win/kvm-guest-drivers-windows/pull/1568"
},
{
"name": "https://github.com/virtio-win/kvm-guest-drivers-windows/commit/c6bef93d7909584bbda4e5c87603ea175825f342",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/virtio-win/kvm-guest-drivers-windows/commit/c6bef93d7909584bbda4e5c87603ea175825f342"
},
{
"name": "https://github.com/virtio-win/kvm-guest-drivers-windows/releases/tag/mm320",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/virtio-win/kvm-guest-drivers-windows/releases/tag/mm320"
}
],
"source": {
"advisory": "GHSA-qrhp-4mhp-hjwh",
"discovery": "UNKNOWN"
},
"title": "virtio-win: Integer overflow causing a heap overflow in Viosock driver"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-46655",
"datePublished": "2026-09-18T16:46:34.832Z",
"dateReserved": "2026-05-15T20:11:54.585Z",
"dateUpdated": "2026-09-18T16:46:50.352Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-46655 (GCVE-0-2026-46655)
Vulnerability from cvelistv5 – Published: 2026-09-18 16:46 – Updated: 2026-09-18 16:46
VLAI
EPSS
VEX
Title
virtio-win: Integer overflow causing a heap overflow in Viosock driver
Summary
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.
Severity
7.8 (High)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/virtio-win/kvm-guest-drivers-w… | x_refsource_CONFIRM |
| https://github.com/virtio-win/kvm-guest-drivers-w… | x_refsource_MISC |
| https://github.com/virtio-win/kvm-guest-drivers-w… | x_refsource_MISC |
| https://github.com/virtio-win/kvm-guest-drivers-w… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| virtio-win | kvm-guest-drivers-windows |
Affected:
>= mm210, < mm320
|
{
"containers": {
"cna": {
"affected": [
{
"product": "kvm-guest-drivers-windows",
"vendor": "virtio-win",
"versions": [
{
"status": "affected",
"version": "\u003e= mm210, \u003c mm320"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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-\u003eFds 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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-122",
"description": "CWE-122: Heap-based Buffer Overflow",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-190",
"description": "CWE-190: Integer Overflow or Wraparound",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-18T16:46:50.352Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/virtio-win/kvm-guest-drivers-windows/security/advisories/GHSA-qrhp-4mhp-hjwh",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/virtio-win/kvm-guest-drivers-windows/security/advisories/GHSA-qrhp-4mhp-hjwh"
},
{
"name": "https://github.com/virtio-win/kvm-guest-drivers-windows/pull/1568",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/virtio-win/kvm-guest-drivers-windows/pull/1568"
},
{
"name": "https://github.com/virtio-win/kvm-guest-drivers-windows/commit/c6bef93d7909584bbda4e5c87603ea175825f342",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/virtio-win/kvm-guest-drivers-windows/commit/c6bef93d7909584bbda4e5c87603ea175825f342"
},
{
"name": "https://github.com/virtio-win/kvm-guest-drivers-windows/releases/tag/mm320",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/virtio-win/kvm-guest-drivers-windows/releases/tag/mm320"
}
],
"source": {
"advisory": "GHSA-qrhp-4mhp-hjwh",
"discovery": "UNKNOWN"
},
"title": "virtio-win: Integer overflow causing a heap overflow in Viosock driver"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-46655",
"datePublished": "2026-09-18T16:46:34.832Z",
"dateReserved": "2026-05-15T20:11:54.585Z",
"dateUpdated": "2026-09-18T16:46:50.352Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}