CVE-2026-46655

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{"affected": [{"affectedData": [{"product": "kvm-guest-drivers-windows", "vendor": "virtio-win", "versions": [{"status": "affected", "version": ">= mm210, < mm320"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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->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."}], "id": "CVE-2026-46655", "lastModified": "2026-09-30T17:31:44.573", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46655", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-23T19:14:57.635548Z", "version": "2.0.3"}}]}, "published": "2026-09-18T17:16:57.373", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/virtio-win/kvm-guest-drivers-windows/commit/c6bef93d7909584bbda4e5c87603ea175825f342"}, {"source": "security-advisories@github.com", "url": "https://github.com/virtio-win/kvm-guest-drivers-windows/pull/1568"}, {"source": "security-advisories@github.com", "url": "https://github.com/virtio-win/kvm-guest-drivers-windows/releases/tag/mm320"}, {"source": "security-advisories@github.com", "url": "https://github.com/virtio-win/kvm-guest-drivers-windows/security/advisories/GHSA-qrhp-4mhp-hjwh"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/virtio-win/kvm-guest-drivers-windows/security/advisories/GHSA-qrhp-4mhp-hjwh"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}, {"lang": "en", "value": "CWE-190"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "virtio-win: viosock.sys: integer overflow in VIOSockSelect leads to heap-based buffer overflow", "id": "2489170", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2489170"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in virtio-win. A low-integrity process can issue an IOCTL request to viosock.sys!VIOSockSelect with a maliciously crafted request that causes an integer overflow. This allows the process to circumvent bounds checking, resulting in a heap overflow in the NonPagedPool kernel heap. The flaw could be exploited to escalate privileges on Windows systems running this driver."], "name": "CVE-2026-46655", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "virtio-win", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "virtio-win", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "virtio-win", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Affected", "package_name": "container-native-virtualization/virtio-win", "product_name": "Red Hat OpenShift Virtualization 4"}], "public_date": "2026-06-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46655\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46655\nhttps://github.com/virtio-win/kvm-guest-drivers-windows/security/advisories/GHSA-qrhp-4mhp-hjwh"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "product": "kvm-guest-drivers-windows", "vendor": "virtio-win"}], "created": "2026-06-17T18:15:10.531251+00:00", "updated": "2026-09-19T13:00:12.297508+00:00", "vendors": ["virtio-win", "virtio-win$PRODUCT$kvm-guest-drivers-windows"]}