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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (24.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Xen — versions consult Xen advisory XSA-394
- Debian Linux — versions 9.0, 11.0
- Fedoraproject Fedora — versions 34
Weakness classification (CWE)
References
- xenbits.xenproject.org/xsa/advisory-394.txt (Patch, Vendor Advisory)
- www.openwall.com/lists/oss-security/2022/01/25/3 (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2022/dsa-5117 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202208-23 (vendor-advisory, Third Party Advisory)
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.