CVE-2026-46655

The Viosock driver (viosock.sys) in virtio-win (versions mm210 through mm319) is vulnerable to a local privilege escalation in Windows guests running QEMU or KVM. A low-privilege process can submit an IOCTL_SELECT request with crafted VIRTIO_VSOCK_SELECT.Fdss[*].fd_count values that cause an inte...

EUVD-2026-83179

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 IOCTLSELECT request with attacker-controlled VIRTIOVSOCKSELECT.Fdss.fdcount values that overflow the 32-bit sum used by VIOSockSelect...

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

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 IOCTLSELECT request with attacker-controlled VIRTIOVSOCKSELECT.Fdss.fdcount values that overflow the 32-bit sum used by VIOSockSelect...

CVE-2026-46655: Heap-based Buffer Overflow

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 IOCTLSELECT request with attacker-controlled VIRTIOVSOCKSELECT.Fdss.fdcount values that overflow the 32-bit sum used by VIOSockSelect...

PT-2026-50250

Name of the Vulnerable Software and Affected Versions virtio-win versions mm210 through mm319 Description The Viosock driver allows a low-privilege local process to submit an IOCTL SELECT request with controlled VIRTIO VSOCK SELECT.Fdss.fd count values. These values can cause an overflow in the...

CVE-2026-46655

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...

EUVD-2026-17111

A flaw was found in virtio-win. The RhelDoUnMap function does not properly validate the number of descriptors provided by a user during an unmap request. A local user could exploit this input validation vulnerability by supplying an excessive number of descriptors, leading to a buffer overrun. Th...

CVE-2026-5164

A flaw was found in virtio-win. The RhelDoUnMap function does not properly validate the number of descriptors provided by a user during an unmap request. A local user could exploit this input validation vulnerability by supplying an excessive number of descriptors, leading to a buffer overrun. Th...

CVE-2026-5165

A flaw was found in virtio-win, specifically within the VirtIO Block BLK device. When the device undergoes a reset, it fails to properly manage memory, resulting in a use-after-free vulnerability. This issue could allow a local attacker to corrupt system memory, potentially leading to system...

CVE-2026-5165

A flaw was found in virtio-win, specifically within the VirtIO Block BLK device. When the device undergoes a reset, it fails to properly manage memory, resulting in a use-after-free vulnerability. This issue could allow a local attacker to corrupt system memory, potentially leading to system...

CVE-2026-5165 Virtio-win: virtio-win: memory corruption via use-after-free in virtio blk device reset

A flaw was found in virtio-win, specifically within the VirtIO Block BLK device. When the device undergoes a reset, it fails to properly manage memory, resulting in a use-after-free vulnerability. This issue could allow a local attacker to corrupt system memory, potentially leading to system...

CVE-2026-5165

CVE-2026-5165 affects virtio-win’s VirtIO Block (BLK) device. A reset can mishandle memory, causing a use-after-free that could allow a local attacker to corrupt memory and cause system instability or unexpected behavior. Connected sources corroborate the issue across NVD, Red Hat and other feeds...

CVE-2026-5165 Virtio-win: virtio-win: memory corruption via use-after-free in virtio blk device reset

A flaw was found in virtio-win, specifically within the VirtIO Block BLK device. When the device undergoes a reset, it fails to properly manage memory, resulting in a use-after-free vulnerability. This issue could allow a local attacker to corrupt system memory, potentially leading to system...

CVE-2026-5164 Virtio-win: virtio-win: denial of service via unvalidated descriptor count in unmap request

A flaw was found in virtio-win. The RhelDoUnMap function does not properly validate the number of descriptors provided by a user during an unmap request. A local user could exploit this input validation vulnerability by supplying an excessive number of descriptors, leading to a buffer overrun. Th...

CVE-2026-5164

A flaw was found in virtio-win. The RhelDoUnMap function does not properly validate the number of descriptors provided by a user during an unmap request. A local user could exploit this input validation vulnerability by supplying an excessive number of descriptors, leading to a buffer overrun. Th...

CVE-2026-5164

The CVE-2026-5164 entry describes a vulnerability in virtio-win where the RhelDoUnMap() function fails to properly validate the number of descriptors in an unmap request. This input validation flaw can be exploited by a local user who supplies an excessive number of descriptors, potentially causi...

CVE-2026-5164 Virtio-win: virtio-win: denial of service via unvalidated descriptor count in unmap request

A flaw was found in virtio-win. The RhelDoUnMap function does not properly validate the number of descriptors provided by a user during an unmap request. A local user could exploit this input validation vulnerability by supplying an excessive number of descriptors, leading to a buffer overrun. Th...

CVE-2026-5165

A flaw was found in virtio-win, specifically within the VirtIO Block BLK device. When the device undergoes a reset, it fails to properly manage memory, resulting in a use-after-free vulnerability. This issue could allow a local attacker to corrupt system memory, potentially leading to system...

CVE-2026-5164

A flaw was found in virtio-win. The RhelDoUnMap function does not properly validate the number of descriptors provided by a user during an unmap request. A local user could exploit this input validation vulnerability by supplying an excessive number of descriptors, leading to a buffer overrun. Th...

CVE-2026-5164: Buffer Copy without Checking Size of Input

A flaw was found in virtio-win. The RhelDoUnMap function does not properly validate the number of descriptors provided by a user during an unmap request. A local user could exploit this input validation vulnerability by supplying an excessive number of descriptors, leading to a buffer overrun. Th...