🛡️ CVE-2022-23033
🟠 CVSS 7.8 — High ✅ No Known Exploit CWE-404 NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-404
Public Exploit ✅ No
Source NVD
Published 2022-01-25
Updated 2026-06-08
Modified 2024-11-21

Affected Packages

Software From version Fixed in
debian-linux
fedora
xen 4.12.0

References

Mailing List, Patch, Third Party Advisory http://www.openwall.com/lists/oss-security/2022/01/25/2
Mailing List, Patch, Third Party Advisory http://www.openwall.com/lists/oss-security/2022/01/25/2

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