Qemu-kvm: heap off-by-one in kvm xen physdevop_map_pirq
Published Feb 18, 2026
6.5
MEDIUMCVSS 3.1
EPSS 0.16%
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
No data.
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Red Hat Enterprise Linux 10
qemu-kvm
Not affected
Red Hat Enterprise Linux 6
qemu-kvm
Not affected
Red Hat Enterprise Linux 7
qemu-kvm
Not affected
Red Hat Enterprise Linux 7
qemu-kvm-ma
Not affected
Red Hat Enterprise Linux 8
virt:rhel/qemu-kvm
Not affected
Red Hat Enterprise Linux 9
qemu-kvm
Not affected
Red Hat OpenShift Container Platform 4
openshift/ose-rhel-coreos-8
Not affected
Red Hat OpenShift Container Platform 4
openshift/ose-rhel-coreos-9
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 6 | qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 7 | qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 7 | qemu-kvm-ma | Not affected | n/a |
| Red Hat Enterprise Linux 8 | virt:rhel/qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 9 | qemu-kvm | Not affected | n/a |
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-8 | Not affected | n/a |
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-9 | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat 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.
References (5)
- https://access.redhat.com/security/cve/CVE-2026-0665 vdb-entryx_refsource_REDHATVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2428640 issue-trackingx_refsource_REDHATIssue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-7934 Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-0665
- https://www.cve.org/CVERecord?id=CVE-2026-0665
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-0665 | vdb-entryx_refsource_REDHATVendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2428640 | issue-trackingx_refsource_REDHATIssue Tracking | |
| https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-7934 | Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-0665 | ||
| https://www.cve.org/CVERecord?id=CVE-2026-0665 |
Change history (0)
No recorded changes yet.
CVE.org / MITRE
CISA Vulnrichment
GitHub
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