CVE-2026-0665 Affecting qemu package, versions <1:10.1.0+ds-5ubuntu2.4


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.14% (4th percentile)

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  • Snyk IDSNYK-UBUNTU2510-QEMU-15011187
  • published16 Jan 2026
  • disclosed18 Feb 2026

Introduced: 16 Jan 2026

CVE-2026-0665  (opens in a new tab)

How to fix?

Upgrade Ubuntu:25.10 qemu to version 1:10.1.0+ds-5ubuntu2.4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Ubuntu. See How to fix? for Ubuntu:25.10 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1