The (1) ioport_read and (2) ioport_write functions in Xen, when qemu is used as a device model within Xen, might allow local x86 HVM guest O
The (1) ioport_read and (2) ioport_write functions in Xen, when qemu is used as a device model within Xen, might allow local x86 HVM guest OS administrators to gain qemu process privileges via vectors involving an out-of-range ioport access.
- Published
- Feb 16, 2017
- Updated
- Jun 16, 2026
- EPSS
- 0.4% · 28th percentile
- CWE
- CWE-264
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Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| citrix | xenserver | cpe:2.3:a:citrix:xenserver |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- citrix xenserver6.0.2
- citrix xenserver6.2.0
- citrix xenserver6.5
- citrix xenserver7.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | xen | before 4.4.0-1 | 4.4.0-1 |
| Debian:7 | xen | before 4.1.6.lts1-12 | 4.1.6.lts1-12 |
| Red Hat:enterprise_linux:5::client | xen | before 0:3.0.3-148.el5_11 | 0:3.0.3-148.el5_11 |
| Red Hat:enterprise_linux:5::client | xen-debuginfo | before 0:3.0.3-148.el5_11 | 0:3.0.3-148.el5_11 |
| Red Hat:enterprise_linux:5::client | xen-libs | before 0:3.0.3-148.el5_11 | 0:3.0.3-148.el5_11 |
| Red Hat:rhel_virtualization:5::client | xen-devel | before 0:3.0.3-148.el5_11 | 0:3.0.3-148.el5_11 |
| SUSE:Linux Enterprise Desktop 12 SP1 | xen | before 4.5.5_02-22.3.1 | 4.5.5_02-22.3.1 |
| SUSE:Linux Enterprise Desktop 12 SP2 | xen | before 4.7.1_02-25.1 | 4.7.1_02-25.1 |
| SUSE:Linux Enterprise Server 11 SP2-LTSS | xen | before 4.1.6_08-32.1 | 4.1.6_08-32.1 |
| SUSE:Linux Enterprise Server for SAP Applications 12 | xen | before 4.4.4_05-22.25.1 | 4.4.4_05-22.25.1 |
| SUSE:Linux Enterprise Software Development Kit 11 SP4 | xen | before 4.4.4_10-43.5 | 4.4.4_10-43.5 |
| SUSE:OpenStack Cloud 5 | xen | before 4.2.5_21-30.1 | 4.2.5_21-30.1 |
Same product
citrix: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-14007Citrix XenServer 7.1 and newer allows Directory Traversal.56Plan
- CVE-2014-4947Buffer overflow in the HVM graphics console support in Citrix XenServer 6.2 Service Pack 1 and earlier has unspecified impact and attack vec42Plan
- CVE-2016-5302Citrix XenServer 7.0 before Hotfix XS70E003, when a deployment has been upgraded from an earlier release, might allow remote attackers on th40Plan
- CVE-2012-4606Citrix XenServer 4.1, 6.0, 5.6 SP2, 5.6 Feature Pack 1, 5.6 Common Criteria, 5.6, 5.5, 5.0, and 5.0 Update 3 contains a Local Privilege Esca31Monitor
- CVE-2014-3798The Windows Guest Tools in Citrix XenServer 6.2 SP1 and earlier allows remote attackers to cause a denial of service (guest OS crash) via a 27Monitor
- CVE-2012-3516The GNTTABOP_swap_grant_ref sub-operation in the grant table hypercall in Xen 4.2 and Citrix XenServer 6.0.2 allows local guest kernels or a27Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:xen | 4.4.0-1 · Debian:12 | Package registry (OSV) |
| red hat:xen | 0:3.0.3-148.el5_11 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:xen-debuginfo | 0:3.0.3-148.el5_11 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:xen-devel | 0:3.0.3-148.el5_11 · Red Hat:rhel_virtualization:5::client | Package registry (OSV) |
| red hat:xen-libs | 0:3.0.3-148.el5_11 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| suse:xen | 4.1.6_08-32.1 · SUSE:Linux Enterprise Server 11 SP2-LTSS | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- Administrator privileges are required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-264 · Permissions, Privileges, and Access ControlsCVSS vector
CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- rhn.redhat.com/errata/RHSA-2016-2963.html
- www.securityfocus.com/bid/94699
- www.securitytracker.com/id/1037397
- xenbits.xen.org/xsa/advisory-199.html
- lists.debian.org/debian-lts-announce/2018/02/msg00005.html
- security.gentoo.org/glsa/201612-56
- support.citrix.com/article/CTX219136
Vendor advisories and official records. Exploit/PoC links are deliberately left out.