{"api_version":"1","generated_at":"2026-04-22T23:53:10+00:00","cve":"CVE-2022-23033","urls":{"html":"https://cve.report/CVE-2022-23033","api":"https://cve.report/api/cve/CVE-2022-23033.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-23033","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-23033"},"summary":{"title":"CVE-2022-23033","description":"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.","state":"PUBLIC","assigner":"security@xen.org","published_at":"2022-01-25 14:15:00","updated_at":"2023-11-07 03:44:00"},"problem_types":["CWE-404"],"metrics":[],"references":[{"url":"https://www.debian.org/security/2022/dsa-5117","name":"DSA-5117","refsource":"DEBIAN","tags":[],"title":"Debian -- Security Information -- DSA-5117-1 xen","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"http://www.openwall.com/lists/oss-security/2022/01/25/2","name":"[oss-security] 20220125 Xen Security Advisory 393 v2 (CVE-2022-23033) - arm: guest_physmap_remove_page not removing the p2m mappings","refsource":"MLIST","tags":[],"title":"oss-security - Xen Security Advisory 393 v2 (CVE-2022-23033) - arm:\n guest_physmap_remove_page not removing the p2m mappings","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://security.gentoo.org/glsa/202208-23","name":"GLSA-202208-23","refsource":"GENTOO","tags":[],"title":"Xen: Multiple Vulnerabilities (GLSA 202208-23) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/","name":"FEDORA-2022-0cc3916e08","refsource":"","tags":[],"title":"[SECURITY] Fedora 34 Update: xen-4.14.4-1.fc34 - 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Only Arm systems are\nvulnerable.\n\nx86 systems are not vulnerable."}]}}},"credit":{"credit_data":{"description":{"description_data":[{"lang":"eng","value":"This issue was discovered by Dmytro Firsov of EPAM."}]}}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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."}]},"impact":{"impact_data":{"description":{"description_data":[{"lang":"eng","value":"A malicious guest may be able to access Xen and other domains' memory.\nThis could cause information leaks, host or domain Denial of Service\n(DoS), and privilege escalations."}]}}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"unknown"}]}]},"references":{"reference_data":[{"url":"https://xenbits.xenproject.org/xsa/advisory-393.txt","refsource":"MISC","name":"https://xenbits.xenproject.org/xsa/advisory-393.txt"},{"refsource":"MLIST","name":"[oss-security] 20220125 Xen Security Advisory 393 v2 (CVE-2022-23033) - arm: guest_physmap_remove_page not removing the p2m mappings","url":"http://www.openwall.com/lists/oss-security/2022/01/25/2"},{"refsource":"FEDORA","name":"FEDORA-2022-0cc3916e08","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/"},{"refsource":"DEBIAN","name":"DSA-5117","url":"https://www.debian.org/security/2022/dsa-5117"},{"refsource":"GENTOO","name":"GLSA-202208-23","url":"https://security.gentoo.org/glsa/202208-23"}]},"workaround":{"workaround_data":{"description":{"description_data":[{"lang":"eng","value":"There is no known mitigation."}]}}}},"nvd":{"publishedDate":"2022-01-25 14:15:00","lastModifiedDate":"2023-11-07 03:44:00","problem_types":["CWE-404"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:L/AC:L/Au:N/C:P/I:P/A:P","accessVector":"LOCAL","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":4.6},"severity":"MEDIUM","exploitabilityScore":3.9,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:xen:xen:*:*:*:*:*:*:arm:*","versionStartIncluding":"4.12.0","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2022","CveId":"23033","Ordinal":"225624","Title":"CVE-2022-23033","CVE":"CVE-2022-23033","Year":"2022"},"notes":[{"CveYear":"2022","CveId":"23033","Ordinal":"1","NoteData":"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. 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