Buffer overflow in Xen
CVE-2018-5244
In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- security.gentoo.org/glsa/201810-06 (vendor-advisory)
- www.securityfocus.com/bid/102433 (VDB Entry, Third Party Advisory, vdb-entry)
- www.securitytracker.com/id/1040774 (vdb-entry)
- xenbits.xen.org/xsa/advisory-253.html (Mitigation, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2018-5244?
- CVE-2018-5244 is a medium-severity vulnerability in Xen, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.5/10. Published 2018-01-05.
- How severe is CVE-2018-5244?
- Medium severity. CVSS v3 base score is 6.5 out of 10.