{"id":"UBUNTU-CVE-2026-0665","details":"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.","modified":"2026-03-07T05:03:50.797217Z","published":"2026-02-18T21:16:00Z","related":["USN-8073-1"],"upstream":["CVE-2026-0665"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-0665"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-0665"},{"type":"REPORT","url":"https://lore.kernel.org/qemu-devel/13FE03BE60EA78D6+20260109023548.4047-1-vr@darknavy.com/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8073-1"}],"affected":[{"package":{"name":"qemu","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/qemu@1:8.2.2+ds-0ubuntu1.13?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.2.2+ds-0ubuntu1.13"}]}],"versions":["1:8.0.4+dfsg-1ubuntu3","1:8.0.4+dfsg-1ubuntu4","1:8.0.4+dfsg-1ubuntu5","1:8.1.3+ds-1ubuntu2","1:8.2.1+ds-1ubuntu1","1:8.2.1+ds-1ubuntu8","1:8.2.1+ds-1ubuntu9","1:8.2.2+ds-0ubuntu1","1:8.2.2+ds-0ubuntu1.2","1:8.2.2+ds-0ubuntu1.4","1:8.2.2+ds-0ubuntu1.5","1:8.2.2+ds-0ubuntu1.6","1:8.2.2+ds-0ubuntu1.7","1:8.2.2+ds-0ubuntu1.8","1:8.2.2+ds-0ubuntu1.9","1:8.2.2+ds-0ubuntu1.10","1:8.2.2+ds-0ubuntu1.11","1:8.2.2+ds-0ubuntu1.12"],"ecosystem_specific":{"binaries":[{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-block-extra"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-block-supplemental"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-guest-agent"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-arm"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-common"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-data"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-gui"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-mips"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-misc"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-modules-opengl"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-modules-spice"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-ppc"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-s390x"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-sparc"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-x86"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-x86-xen"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-system-xen"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-user"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-user-binfmt"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-user-static"},{"binary_version":"1:8.2.2+ds-0ubuntu1.13","binary_name":"qemu-utils"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0665.json"}},{"package":{"name":"qemu","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/qemu@1:10.1.0+ds-5ubuntu2.4?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:10.1.0+ds-5ubuntu2.4"}]}],"versions":["1:9.2.1+ds-1ubuntu5","1:10.0.2+ds-1ubuntu1","1:10.0.2+ds-1ubuntu2","1:10.1.0+ds-1ubuntu1","1:10.1.0+ds-5ubuntu1","1:10.1.0+ds-5ubuntu2","1:10.1.0+ds-5ubuntu2.1","1:10.1.0+ds-5ubuntu2.2"],"ecosystem_specific":{"binaries":[{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-block-extra"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-block-supplemental"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-guest-agent"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-arm"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-common"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-data"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-gui"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-mips"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-misc"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-modules-opengl"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-modules-spice"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-ppc"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-riscv"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-s390x"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-sparc"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-x86"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-x86-xen"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-system-xen"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-user"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-user-binfmt"},{"binary_version":"1:10.1.0+ds-5ubuntu2.4","binary_name":"qemu-utils"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0665.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}