{"id":"CVE-2023-5088","title":"Qemu: improper ide controller reset can lead to mbr overwrite","summary":"A bug in QEMU could cause a guest I/O operation otherwise addressed to an arbitrary disk offset to be targeted to offset 0 instead (potentially overwriting the VM's boot code). This could be used, for example, by L2 guests with a virtual…","severity":"medium","cvss":6.4,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-821"],"vendor":"Red Hat","product":"virt-devel:rhel","affected":["virt-devel:rhel (all versions)","virt:rhel (all versions)","qemu-kvm (all versions)","qemu-kvm","qemu-kvm","qemu-kvm-ma","virt:av/qemu-kvm (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2025-06-12T14:28:52.090327Z"},"published":"2023-11-03","updated":"2026-11-07","sourceUpdated":"2026-11-07T13:41:35.696Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-5088","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:2135","label":"RHSA-2024:2135"},{"url":"https://access.redhat.com/errata/RHSA-2024:2962","label":"RHSA-2024:2962"},{"url":"https://access.redhat.com/security/cve/CVE-2023-5088"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2247283","label":"RHBZ#2247283"},{"url":"https://lore.kernel.org/all/20230921160712.99521-1-simon.rowe@nutanix.com/T/"}],"tags":["cve.org"],"epss":0.00257,"epssPercentile":0.17484,"ingestedAt":"2026-11-07T14:18:21.471Z","slug":"CVE-2023-5088","body":"## Overview\n\nA bug in QEMU could cause a guest I/O operation otherwise addressed to an arbitrary disk offset to be targeted to offset 0 instead (potentially overwriting the VM's boot code). This could be used, for example, by L2 guests with a virtual disk (vdiskL2) stored on a virtual disk of an L1 (vdiskL1) hypervisor to read and/or write data to LBA 0 of vdiskL1, potentially gaining control of L1 at its next reboot.\n\n## Affected\n\n- `virt-devel:rhel (all versions)`\n- `virt:rhel (all versions)`\n- `qemu-kvm (all versions)`\n- `qemu-kvm`\n- `qemu-kvm`\n- `qemu-kvm-ma`\n- `virt:av/qemu-kvm (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nMitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":35.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}