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Vulnerability · Published Feb 18, 2026 · Assigned by fedora

CVE-2026-0665Qemu-kvm: heap off-by-one in kvm xen physdevop_map_pirq

Medium 6.5

In plain English

A medium-severity out-of-bounds write in qemu. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.2%top 93.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13qemu1:10.0.8+ds-0+deb13u1DEBIAN-CVE-2026-0665
Debian:14qemu1:10.2.0+ds-2DEBIAN-CVE-2026-0665
Ubuntu:22.04:LTSqemu1:6.2+dfsg-2ubuntu6.28USN-8073-1
Ubuntu:24.04:LTSqemu1:8.2.2+ds-0ubuntu1.13USN-8073-1
Ubuntu:24.04:LTSqemu1:8.2.2+ds-0ubuntu1.13UBUNTU-CVE-2026-0665
Ubuntu:25.10qemu1:10.1.0+ds-5ubuntu2.4USN-8073-1
Ubuntu:25.10qemu1:10.1.0+ds-5ubuntu2.4UBUNTU-CVE-2026-0665

Affected products (as reported)

VendorProductVersions
qemu 8.0.0 – through 10.2.0
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

References