cbcvebase.
CVE-2022-23033
published 2022-01-25

CVE-2022-23033: 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…

PriorityP339high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.34%
26.5th percentile
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.

Affected

8 ranges
VendorProductVersion rangeFixed in
debiandebian_linux——
debianxen< xen 4.16.0+51-g0941d6cb-1 (bookworm)xen 4.16.0+51-g0941d6cb-1 (bookworm)
fedoraprojectfedora——
xenxen>= 0 < 4.14.4+74-gd7b22226b5-14.14.4+74-gd7b22226b5-1
xenxen>= 0 < 4.16.0+51-g0941d6cb-14.16.0+51-g0941d6cb-1
xenxen>= 0 < 4.16.0+51-g0941d6cb-14.16.0+51-g0941d6cb-1
xenxen>= 0 < 4.16.0+51-g0941d6cb-14.16.0+51-g0941d6cb-1
xenxen>= 4.12.0—

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv2.04.6MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:P
osv7.8HIGH
vendor_debian7.8HIGH
vendor_redhat7.8HIGH
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