CVE-2022-23033

Advisory lineage Upstream: 0 Downstream: 10
Modified
Published: 25 Jan 2022, 13:36
Last modified:03 Aug 2024, 03:28

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.09% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Jan 2022, 13:36
Published
Vulnerability first disclosed
03 Aug 2024, 03:28
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • v2.0•MEDIUM•Score: 4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.09%• Percentile: 26%

Techniques & Countermeasures

  • CWE-404•Improper Resource Shutdown or Release

    The product does not release or incorrectly releases a resource before it is made available for re-use.

Affected Systems

  • debian•debian_linux

    11.0

  • fedoraproject•fedora

    34

  • xen•xen

    ≥ 4.12.0

References (5)