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Es posible tener una entrada v\u00e1lida en la tabla de p\u00e1ginas sin el bit v\u00e1lido establecido cuando un sistema operativo hu\u00e9sped usa instrucciones de mantenimiento de cach\u00e9 set/way. 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{"bugzilla": {"description": "xen: arm: guest_physmap_remove_page not removing the p2m mappings (XSA-393)", "id": "2045043", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2045043"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-863", "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."], "name": "CVE-2022-23033", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel-xen", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2022-01-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-23033\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-23033"], "threat_severity": "Moderate"}