An off-by-one error was found in QEMU's KVM Xen guest support. A malicious guest could use this flaw to trigger out-of-bounds heap accesses in the QEMU process via the emulated Xen physdev hypercall interface, leading to a denial of service or potential memory corruption.
History

Wed, 18 Feb 2026 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Wed, 18 Feb 2026 21:00:00 +0000

Type Values Removed Values Added
Title qemu-kvm: Heap off-by-one in KVM Xen PHYSDEVOP_map_pirq Qemu-kvm: heap off-by-one in kvm xen physdevop_map_pirq
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
CPEs 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 openshift
References

Tue, 13 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
Description An off-by-one error was found in QEMU's KVM Xen guest support. A malicious guest could use this flaw to trigger out-of-bounds heap accesses in the QEMU process via the emulated Xen physdev hypercall interface, leading to a denial of service or potential memory corruption.
Title qemu-kvm: Heap off-by-one in KVM Xen PHYSDEVOP_map_pirq
Weaknesses CWE-125
CWE-787
References
Metrics threat_severity

None

cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H'}

threat_severity

Moderate


cve-icon MITRE

Status: PUBLISHED

Assigner: fedora

Published: 2026-02-18T20:50:03.724Z

Updated: 2026-02-18T21:27:14.216Z

Reserved: 2026-01-07T12:09:11.643Z

Link: CVE-2026-0665

cve-icon Vulnrichment

Updated: 2026-02-18T21:27:06.428Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-18T21:16:22.633

Modified: 2026-02-19T15:53:02.850

Link: CVE-2026-0665

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-01-09T00:00:00Z

Links: CVE-2026-0665 - Bugzilla