Vulnerability in Citrix Xenserver
CVE-2016-6258
The PV pagetable code in arch/x86/mm.c in Xen 4.7.x and earlier allows local 32-bit PV guest OS administrators to gain host OS privileges by leveraging fast-paths for updating pagetable entries.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.7% 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
- Citrix Xenserver — versions 6.0, 6.0.2, 6.1
- Xen — versions 3.4.0, 3.4.2, 3.4.3
Weakness classification (CWE)
References
- www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html (Release Notes)
- xenbits.xen.org/xsa/advisory-182.html (Patch, Mitigation, Vendor Advisory)
- xenbits.xen.org/xsa/xsa182-4.6.patch (Patch)
- support.citrix.com/article/CTX214954 (Vendor Advisory)
- security.gentoo.org/glsa/201611-09 (vendor-advisory)
- xenbits.xen.org/xsa/xsa182-unstable.patch (Patch)
- xenbits.xen.org/xsa/xsa182-4.5.patch (Patch)
- www.debian.org/security/2016/dsa-3633 (vendor-advisory)
- www.securitytracker.com/id/1036446 (Third Party Advisory, vdb-entry)
- www.securityfocus.com/bid/92131 (Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2016-6258?
- CVE-2016-6258 is a high-severity vulnerability in Citrix Xenserver, classified under Improper Access Control. CVSS score: 8.8/10. Published 2016-08-02.
- How severe is CVE-2016-6258?
- High severity. CVSS v3 base score is 8.8 out of 10.