CVE & CISA-KEV Catalog

CVE-2026-0665

MEDIUM

6.5

CVSS v3

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.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

qemuDebian

Fixed in:1:10.0.8+ds-0+deb13u1CVE-2026-0665

Fixed in:1:10.2.0+ds-2CVE-2026-0665

qemuUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-systemUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-armUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-commonUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-dataUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-guiUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-mipsUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-miscUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-modules-openglUbuntu

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-modules-spiceUbuntu

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-ppcUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-riscvUbuntu

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-s390xUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-sparcUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-x86Ubuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-x86-microvmUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

qemu-system-x86-xenUbuntu

Fixed in:1:6.2+dfsg-2ubuntu6.28USN-8073-1

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

qemu-system-xenUbuntu

Fixed in:1:8.2.2+ds-0ubuntu1.13USN-8073-1

Fixed in:1:10.1.0+ds-5ubuntu2.4USN-8073-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.14%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-19.