Vulnerability in Xen
CVE-2016-3157
The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel does not properly context-switch IOPL on 64-bit PV Xen guests, which allows local guest OS users to gain privileges, cause a denial of service (guest OS crash), or obtain sensitive information by leveraging I/O port access.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Xen — versions 4.0.0
- Canonical Ubuntu Linux — versions 12.04
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.ubuntu.com/usn/USN-2971-2 (vendor-advisory)
- xenbits.xen.org/xsa/advisory-171.html (Patch, Vendor Advisory)
- www.ubuntu.com/usn/USN-2970-1 (vendor-advisory)
- www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- www.ubuntu.com/usn/USN-2969-1 (vendor-advisory)
- www.ubuntu.com/usn/USN-2968-1 (vendor-advisory)
- www.ubuntu.com/usn/USN-2971-3 (vendor-advisory)
- www.ubuntu.com/usn/USN-2997-1 (vendor-advisory)
- www.debian.org/security/2016/dsa-3607 (vendor-advisory)
- www.ubuntu.com/usn/USN-2971-1 (vendor-advisory)
Frequently asked questions
- What is CVE-2016-3157?
- CVE-2016-3157 is a high-severity vulnerability in Xen, classified under CWE-264. CVSS score: 7.8/10. Published 2016-04-12.
- How severe is CVE-2016-3157?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2016-3157 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.