Fiche vulnérabilité
CVE-2022-23033 : faille élevée xen xen (CVSS 7.8)
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.
En bref
- Sévérité
- Élevée (CVSS 7.8)
- Vecteur CVSS
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Exploitation active
- Non signalée par la CISA
- Publication
- 25 janv. 2022
- Dernière mise à jour
- 17 juin 2026
Produits concernés
- xen xen
- fedoraproject fedora
- debian debian linux