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CVE-2026-0665· NVD / CVE Program· CNA fedora

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

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.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Feb 18, 2026
Updated
Jun 17, 2026
EPSS
0.2% · 4th percentile
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Report tools

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Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · fedora
6.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (fedora). Independent of NVD's CPE analysis and usually ahead of it.

  • gitlab.com/qemu-project/qemu qemu

    • 8.0.0 and later · up to and including 10.2.0affected · semver

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown
    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsunknown

  • Red Hat Red Hat OpenShift Container Platform 4

    • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13qemubefore 1:10.0.8+ds-0+deb13u11:10.0.8+ds-0+deb13u1
Debian:14qemubefore 1:10.2.0+ds-21:10.2.0+ds-2
openSUSE:Leap 15.6qemubefore 8.2.10-150600.3.46.18.2.10-150600.3.46.1
openSUSE:Leap 15.6qemu-linux-userbefore 8.2.10-150600.3.46.18.2.10-150600.3.46.1
openSUSE:Leap 16.0qemubefore 10.0.8-160000.1.110.0.8-160000.1.1
openSUSE:Leap 16.0qemu-linux-userbefore 10.0.8-160000.1.110.0.8-160000.1.1
openSUSE:Tumbleweedqemubefore 10.2.0-2.110.2.0-2.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7qemubefore 9.2.4-150700.3.14.19.2.4-150700.3.14.1
SUSE:Linux Enterprise Module for Package Hub 15 SP7qemu-linux-userbefore 9.2.4-150700.3.14.19.2.4-150700.3.14.1
SUSE:Linux Enterprise Server 15 SP6-LTSSqemubefore 8.2.10-150600.3.49.18.2.10-150600.3.49.1
SUSE:Linux Micro 6.0qemubefore 8.2.10-2.18.2.10-2.1
SUSE:Linux Micro 6.1qemubefore 8.2.10-slfo.1.1_4.18.2.10-slfo.1.1_4.1
SUSE:Linux Micro 6.2qemubefore 10.0.8-160000.1.110.0.8-160000.1.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    42Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor
  • CVE-2025-4404Freeipa: idm: privilege escalation from host to domain admin in freeipa
    37Monitor
  • CVE-2025-7493Freeipa: idm: privilege escalation from host to domain admin in freeipa
    36Monitor
  • CVE-2025-49796Libxml: type confusion leads to denial of service (dos)
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:qemu1:10.0.8+ds-0+deb13u1 · Debian:13Package registry (OSV)
opensuse:qemu8.2.10-150600.3.46.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:qemu-linux-user8.2.10-150600.3.46.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:qemu9.2.4-150700.3.14.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:qemu-linux-user9.2.4-150700.3.14.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-81627212 days apartQemu-kvm: vapic writable rom alias can escape the option-rom window and expose locked smram
    32Monitor
  • CVE-2026-3842147 days apartQemu-kvm: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host oob write
    31Monitor
  • CVE-2026-18220161 days apartBinutils: binutils: out-of-bounds write in bfd dlx elf backend relocation processing
    31Monitor
  • CVE-2026-97185218 days apartGimp: gimp: out-of-bounds write in gimpressionist plugin via crafted preset file
    31Monitor
  • CVE-2026-650758 days apartDnsmasq: dnsmasq: denial of service due to out-of-bounds write in dhcp bootreply processing
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records