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CVE-2022-23033

Status: ModifiedHigh (7.8)—

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.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (3)

Debian — Debian LinuxFedoraproject — FedoraXEN — XEN

CWEs

References

Raw JSON (NVD)

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  "id": "CVE-2022-23033",
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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  "published": "2022-01-25T14:15:08.967",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "lang": "en",
      "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."
    },
    {
      "lang": "es",
      "value": "arm: la función guest_physmap_remove_page no elimina los mapeos p2m Las funciones para eliminar una o más entradas de una tabla de páginas p2m de huésped en Arm (p2m_remove_mapping, guest_physmap_remove_page y p2m_set_entry con mfn establecido como INVALID_MFN) no borran realmente la entrada de la tabla de páginas si la entrada no presenta el bit válido establecido. Es posible tener una entrada válida en la tabla de páginas sin el bit válido establecido cuando un sistema operativo huésped usa instrucciones de mantenimiento de caché set/way. Por ejemplo, un huésped que emite una instrucción de mantenimiento de caché set/way, y luego llama a la hiperllamada XENMEM_decrease_reservation para devolver páginas de memoria a Xen, podría ser capaz de retener el acceso a esas páginas incluso después de que Xen empezara a reusarlas para otros propósitos"
    }
  ],
  "lastModified": "2026-06-17T04:29:23.107",
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