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Fencer Intel
medium 6.5

CVE-2026-0665 json

Qemu-kvm: heap off-by-one in kvm xen physdevop_map_pirq

published 8mo ago modified 4mo ago also EUVD-2026-7934

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits
0
none known

Summary

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.

Patch / fix

  • qemu Debian 13 1:10.0.8+ds-0+deb13u1
  • qemu Debian 14 1:10.2.0+ds-2

debian advisories DEBIAN-CVE-2026-0665

  • qemu Ubuntu 24.04 LTS 1:8.2.2+ds-0ubuntu1.13
  • qemu Ubuntu 25.10 1:10.1.0+ds-5ubuntu2.4

ubuntu advisories UBUNTU-CVE-2026-0665

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • qemu Linux Micro 6.2 10.0.8-160000.1.1
  • qemu Linux Micro 6.1 8.2.10-slfo.1.1_4.1
  • qemu Linux Micro 6.0 8.2.10-2.1
  • qemu openSUSE Leap 15.6 8.2.10-150600.3.46.1
  • qemu-linux-user openSUSE Leap 15.6 8.2.10-150600.3.46.1
  • qemu SLE Module for Server Applications 15 SP7, SLE Module for Package Hub 15 SP7, SLE Module for Basesystem 15 SP7 9.2.4-150700.3.14.1
  • qemu-linux-user SLE Module for Package Hub 15 SP7 9.2.4-150700.3.14.1
  • qemu SLES for SAP 15 SP6, SLES 15 SP6-LTSS 8.2.10-150600.3.49.1

suse advisories SUSE-SU-2026:2386-1SUSE-SU-2026:20693-1SUSE-SU-2026:20666-1SUSE-SU-2026:20716-1SUSE-SU-2026:0662-1SUSE-SU-2026:0445-1

  • qemu openSUSE Leap 16.0 10.0.8-160000.1.1
  • qemu-linux-user openSUSE Leap 16.0 10.0.8-160000.1.1
  • qemu openSUSE Tumbleweed 10.2.0-2.1

opensuse advisories openSUSE-SU-2026:20357-1openSUSE-SU-2026:10097-1

Is CVE-2026-0665 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-0665 updated cvss 6.5

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

  • Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32 Red Hat Enterprise Linux 7 qemu-img, qemu-kvm, libcacard, qemu-img-ma, qemu-kvm-ma, qemu-kvm-tools, +5 more Red Hat Enterprise Linux 8 qemu-img, qemu-kvm, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, qemu-guest-agent, +8 more Red Hat Enterprise Linux 9 qemu-img, qemu-kvm, qemu-kvm-core, qemu-kvm-tools, qemu-pr-helper, qemu-kvm-common, +16 more Red Hat Enterprise Linux 10 qemu-kvm Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
8mo ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.