A type mismatch vulnerability was found in QEMU's vhost inflight migration VMState handling. The destination buffer size is stored as a uint64_t but read by the VMS_VBUFFER load path as a signed int32_t. On little-endian hosts, a crafted incoming migration state with bit 31 set causes the value to be interpreted as negative and then implicitly converted to a very large size_t, leading qemu_get_buffer() to copy migration-stream data beyond the bounds of the mmap-backed inflight region. This can result in a crash of the QEMU process or memory corruption. Exploitation requires control of the migration producer or write access to the migration channel, combined with a destination configured to use vhost inflight migration.
History

Tue, 11 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 11 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Qemu
Qemu qemu
Redhat enterprise Linux For Nvidia 26
Redhat openshift Container Platform
Vendors & Products Qemu
Qemu qemu
Redhat enterprise Linux For Nvidia 26
Redhat openshift Container Platform

Tue, 11 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Mon, 10 Aug 2026 21:30:00 +0000

Type Values Removed Values Added
Description A type mismatch vulnerability was found in QEMU's vhost inflight migration VMState handling. The destination buffer size is stored as a uint64_t but read by the VMS_VBUFFER load path as a signed int32_t. On little-endian hosts, a crafted incoming migration state with bit 31 set causes the value to be interpreted as negative and then implicitly converted to a very large size_t, leading qemu_get_buffer() to copy migration-stream data beyond the bounds of the mmap-backed inflight region. This can result in a crash of the QEMU process or memory corruption. Exploitation requires control of the migration producer or write access to the migration channel, combined with a destination configured to use vhost inflight migration.
Title Qemu-kvm: vhost inflight migration vmstate integer type mismatch causes out-of-bounds access
First Time appeared Redhat
Redhat enterprise Linux
Redhat enterprise Linux Nvidia
Redhat openshift
Weaknesses CWE-681
CPEs cpe:/a:redhat:enterprise_linux_nvidia:
cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat enterprise Linux Nvidia
Redhat openshift
References
Metrics cvssV3_1

{'score': 4.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-08-10T21:22:29.414Z

Updated: 2026-08-11T17:51:23.060Z

Reserved: 2026-04-16T11:09:18.538Z

Link: CVE-2026-6426

cve-icon Vulnrichment

Updated: 2026-08-11T17:41:12.327Z

cve-icon NVD

Status : Received

Published: 2026-08-10T22:17:10.027

Modified: 2026-08-11T18:18:18.400

Link: CVE-2026-6426

cve-icon Redhat

Severity : Low

Publid Date: 2026-08-10T00:00:00Z

Links: CVE-2026-6426 - Bugzilla