CVE-2026-0665

qemu-kvm: Heap off-by-one in KVM Xen PHYSDEVOP_map_pirq

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Severity

Moderate

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · January 9, 2026

Updated · August 31, 2026

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.

Statement

Xen guest support is disabled at build time in the qemu-kvm packages as shipped with Red Hat Enterprise Linux. Consequently, RHEL is not affected by this CVE.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CWE-787 · Out-of-bounds Write