CVE-2023-34322

Advisory lineage Upstream: 0 Downstream: 12
Modified
Published: 05 Jan 2024, 16:18
Last modified:04 Nov 2025, 19:16

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.06% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

05 Jan 2024, 16:18
Published
Vulnerability first disclosed
04 Nov 2025, 19:16
Last Modified
Vulnerability information updated

Description

For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. Since Xen itself needs to be mapped when PV guests run, Xen and shadowed PV guests run directly the respective shadow page tables. For 64-bit PV guests this means running on the shadow of the guest root page table. In the course of dealing with shortage of memory in the shadow pool associated with a domain, shadows of page tables may be torn down. This tearing down may include the shadow root page table that the CPU in question is presently running on. While a precaution exists to supposedly prevent the tearing down of the underlying live page table, the time window covered by that precaution isn't large enough.

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

EPSS Trends

Current EPSS score: 0.06%• Percentile: 19%

Techniques & Countermeasures

  • CWE-273•Improper Check for Dropped Privileges

    The product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded.

Affected Systems

  • xen•xen

    ≥ 3.2.0, < 4.15.0

References (2)