Vulnerability CVE-2026-0665: Information

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.

Severity: MEDIUM (6.5)
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
URL: https://nvd.nist.gov/vuln/detail/CVE-2026-0665
Published: Feb. 18, 2026
Modified: Feb. 19, 2026
Error type identifier: CWE-787

Fixed packages

Package name
Branch
Fixed in version
Version from repository
Errata ID
Task #
State
qemusisyphus10.1.4-alt110.1.4-alt1ALT-PU-2026-3760-1409502Fixed
qemusisyphus_riscv6410.1.4-alt110.1.4-alt1ALT-PU-2026-3838-1-Fixed

References to Advisories, Solutions, and Tools

Hyperlink
Resource
https://access.redhat.com/security/cve/CVE-2026-0665
    https://bugzilla.redhat.com/show_bug.cgi?id=2428640
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