Vulnetix
Try Vulnetix Request Demo
CVE-2022-23033 PUBLISHED CVSS 4.599999904632568 MEDIUM

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.

EPSS 0.09% · 25.9th percentile

Risk Scores

CVSS v2.0
4.599999904632568
EPSS Score
0.09%
25.9th percentile

Affected Products

VendorProductVersions
debiandebian_linux11.0
xenxen4.12.0
Xenxenconsult Xen advisory XSA-393
fedoraprojectfedora34

Timeline

References

Open in Interactive Console →