Vulnerability in Xen

CVE-2023-34326

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed. Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (19.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2023-34326: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

  • Xen — versions consult Xen advisory XSA-442

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2023-34326?
CVE-2023-34326 is a high-severity vulnerability in Xen, classified under Operation on a Resource after Expiration or Release. CVSS score: 7.8/10. Published 2024-01-05.
How severe is CVE-2023-34326?
High severity. CVSS v3 base score is 7.8 out of 10.