Integer overflow in Xen
CVE-2022-23034
A PV guest could DoS Xen while unmapping a grant To address XSA-380, reference counting was introduced for grant mappings for the case where a PV guest would have the IOMMU enabled. PV guests can request two forms of mappings. When both are in use for any individual mapping, unmapping of such a mapping can be requested in two steps. The reference count for such a mapping would then mistakenly be decremented twice. Underflow of the counters gets detected, resulting in the triggering of a hypervisor bug check.
EPSS: 0.003 (26.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Xen — versions consult Xen advisory XSA-394
- Debian Debian_linux — versions 9.0, 11.0
- Fedoraproject Fedora — versions 34
Weakness classification (CWE)
References
- security@xen.org (Patch, x_refsource_MISC, Vendor Advisory)
- security@xen.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- security@xen.org (x_refsource_FEDORA, vendor-advisory)
- security@xen.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- security@xen.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
Frequently asked questions
- What is CVE-2022-23034?
- CVE-2022-23034 is a medium-severity vulnerability in Xen, classified under Integer Underflow. CVSS score: 5.5/10. Published 2022-01-25.
- How severe is CVE-2022-23034?
- Medium severity. CVSS v3 base score is 5.5 out of 10.