The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not
The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not verify that kernel mode is used to call the handle_gdt_ldt_mapping_fault function, which allows guest OS users to cause a denial of service (host OS BUG_ON) via a crafted memory access.
- Published
- Jan 24, 2011
- Updated
- Jun 16, 2026
- EPSS
- 0.8% · 54th percentile
- CWE
- —
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Report tools
Action score
24
Monitor
Low priority for now.
- CVSS
- 24 / 40 · 6.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.8%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| citrix | xen | cpe:2.3:a:citrix:xen |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- citrix xenup to 4.0.1 inclusive
- citrix xen3.0.2
- citrix xen3.0.3
- citrix xen3.0.4
- citrix xen3.1.2
- citrix xen3.1.3
- citrix xen3.1.4
- citrix xen3.2.0
- citrix xen3.2.1
- citrix xen3.2.2
- citrix xen3.2.3
- citrix xen3.3.0
- citrix xen3.3.1
- citrix xen3.3.2
- citrix xen3.4.0
- citrix xen3.4.1
- citrix xen3.4.2
- citrix xen3.4.3
- citrix xen4.0.0
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 4.0.1-2 | 4.0.1-2 |
| Red Hat:enterprise_linux:5::client | kernel | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-debug | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-debug-debuginfo | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-debug-devel | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-debuginfo | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-debuginfo-common | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-devel | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-doc | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-headers | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-PAE | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-PAE-debuginfo | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-PAE-devel | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-xen | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-xen-debuginfo | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::client | kernel-xen-devel | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::server | kernel-kdump | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::server | kernel-kdump-debuginfo | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
| Red Hat:enterprise_linux:5::server | kernel-kdump-devel | before 0:2.6.18-238.el5 | 0:2.6.18-238.el5 |
Same product
citrix: all recordsOther highest-scoring records for the same primary product.
- CVE-2011-1898Xen 4.1 before 4.1.1 and 4.0 before 4.0.2, when using PCI passthrough on Intel VT-d chipsets that do not have interrupt remapping, allows gu29Monitor
- CVE-2008-5716xend in Xen 3.3.0 does not properly restrict a guest VM's write access within the /local/domain xenstore directory tree, which allows guest 28Monitor
- CVE-2008-4405xend in Xen 3.0.3 does not properly limit the contents of the /local/domain xenstore directory tree, and does not properly restrict a guest 28Monitor
- CVE-2011-1583Multiple integer overflows in tools/libxc/xc_dom_bzimageloader.c in Xen 3.2, 3.3, 4.0, and 4.1 allow local users to cause a denial of servic27Monitor
- CVE-2010-3699The backend driver in Xen 3.x allows guest OS users to cause a denial of service via a kernel thread leak, which prevents the device and gue10Monitor
- CVE-2011-3262tools/libxc/xc_dom_bzimageloader.c in Xen 3.2, 3.3, 4.0, and 4.1 allows local users to cause a denial of service (management software infini8Monitor
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 | 4.0.1-2 · Debian:12 | Package registry (OSV) |
| red hat:kernel | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-debug | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-debuginfo | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-debuginfo-common | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-devel | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-doc | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-headers | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-PAE | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-PAE-debuginfo | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:kernel-PAE-devel | 0:2.6.18-238.el5 · Red Hat:enterprise_linux:5::client | 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
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- C · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- C
Weakness class (CWE)
—
CVSS vector
AV:A/AC:L/Au:N/C:N/I:N/A:C
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
- lists.xensource.com/archives/html/xen-devel/2010-11/msg01650.html
- openwall.com/lists/oss-security/2010/11/30/5
- openwall.com/lists/oss-security/2010/11/30/8
- secunia.com/advisories/42884
- secunia.com/advisories/46397
- www.redhat.com/support/errata/RHSA-2011-0017.html
- www.securityfocus.com/archive/1/520102/100/0/threaded
- www.vmware.com/security/advisories/VMSA-2011-0012.html
- bugzilla.redhat.com/show_bug.cgi?id=658155
Vendor advisories and official records. Exploit/PoC links are deliberately left out.