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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | qemu | 8.0.0 – ≤ 10.2.0 | — |
| 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 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | qemu | 1:10.2.0+ds-2 | — |
| Debian 13 | qemu | 1:10.0.8+ds-0+deb13u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | qemu | 1:10.1.0+ds-5ubuntu2.4 | USN-8073-1 |
| Ubuntu 24.04 LTS | qemu | 1:8.2.2+ds-0ubuntu1.13 | USN-8073-1 |
| Ubuntu 22.04 LTS | qemu | 1:6.2+dfsg-2ubuntu6.28 | USN-8073-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | qemu +1 | 9.2.4-150700.3.14.1 | SUSE-SU-2026:0445-1 |
| SLES 15 SP6 | qemu | 8.2.10-150600.3.49.1 | SUSE-SU-2026:2386-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | qemu | 8.2.10-150600.3.49.1 | SUSE-SU-2026:2386-1 |
| SLE Micro 6.2 | qemu | 10.0.8-160000.1.1 | SUSE-SU-2026:20693-1 |
| SLE Micro 6.1 | qemu | 8.2.10-slfo.1.1_4.1 | SUSE-SU-2026:20666-1 |
| SLE Micro 6.0 | qemu | 8.2.10-2.1 | SUSE-SU-2026:20716-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | qemu | 10.2.0-2.1 | openSUSE-SU-2026:10097-1 |
| openSUSE Leap 16.0 | qemu +1 | 10.0.8-160000.1.1 | openSUSE-SU-2026:20357-1 |
| openSUSE Leap 15.6 | qemu +1 | 8.2.10-150600.3.46.1 | SUSE-SU-2026:0662-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | qemu-img +10 | 31:7.2.0-37.el9 | ELSA-2026-50241 |
| Oracle Linux 8 | hivex +4 | 1.3.18-23.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | libguestfs-winsupport | 8.10-1.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | libiscsi +2 | 1.18.0-8.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | libnbd +4 | 1.6.0-6.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | libtpms +1 | 0.9.1-3.20211126git1ff6fe1f43.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | libvirt +29 | 9.0.0-16.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | nbdkit +18 | 1.24.0-5.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | netcf +2 | 0.2.8-12.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | perl-Sys-Virt | 8.0.0-1.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | qemu-img +11 | 15:7.2.0-37.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | seabios +2 | 1.16.0-4.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | sgabios +1 | 1:0.20170427git-3.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | supermin +1 | 5.2.1-2.0.1.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | swtpm +4 | 0.7.0-4.20211109gitb79fd91.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | virt-dib +22 | 1:1.44.0-9.0.3.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
| Oracle Linux 8 | virt-v2v +3 | 1:1.42.0-22.module+el8.10.0+90872+a1d63504 | ELSA-2026-50239 |
Advisories 11
- SUSE-SU-2026:2386-1 Security update for qemu SUSE / openSUSE Security Updates · Jun 13, 2026
- USN-8073-1 qemu vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- ELSA-2026-50241 Moderate: qemu-kvm security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Apr 24, 2026
- ELSA-2026-50239 Moderate: virt:kvm_utils3 bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 24, 2026
- openSUSE-SU-2026:20357-1 Security update for qemu SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10097-1 qemu-10.2.0-2.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20716-1 Security update for qemu SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20693-1 Security update for qemu SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20666-1 Security update for qemu SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0662-1 Security update for qemu SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0445-1 Security update for qemu SUSE / openSUSE Security Updates · Mar 23, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-0665 vdb-entry
- RHBZ#2428640 issue-tracking