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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

No data.

No data.

References
Link Providers
https://nvd.nist.gov/vuln/detail/CVE-2026-0665 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-0665 cve-icon
History

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

No data.

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2026-0665 - Bugzilla

cve-icon OpenCVE Enrichment

No data.