{"id":"CVE-2022-23033","details":"arm: guest_physmap_remove_page not removing the p2m mappings The functions to remove one or more entries from a guest p2m pagetable on Arm (p2m_remove_mapping, guest_physmap_remove_page, and p2m_set_entry with mfn set to INVALID_MFN) do not actually clear the pagetable entry if the entry doesn't have the valid bit set. It is possible to have a valid pagetable entry without the valid bit set when a guest operating system uses set/way cache maintenance instructions. For instance, a guest issuing a set/way cache maintenance instruction, then calling the XENMEM_decrease_reservation hypercall to give back memory pages to Xen, might be able to retain access to those pages even after Xen started reusing them for other purposes.","modified":"2026-03-15T22:43:46.959181Z","published":"2022-01-25T14:15:08.967Z","related":["SUSE-SU-2022:0333-1","SUSE-SU-2022:0467-1","SUSE-SU-2022:0468-1","SUSE-SU-2022:0469-1","openSUSE-SU-2022:0333-1","openSUSE-SU-2024:11781-1"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/"},{"type":"ADVISORY","url":"https://xenbits.xenproject.org/xsa/advisory-393.txt"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202208-23"},{"type":"ADVISORY","url":"https://www.debian.org/security/2022/dsa-5117"},{"type":"FIX","url":"http://www.openwall.com/lists/oss-security/2022/01/25/2"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"4.12.0"}]},{"events":[{"introduced":"0"},{"last_affected":"34"}]},{"events":[{"introduced":"0"},{"last_affected":"11.0"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-23033.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}