The PCI backend driver in Xen, when running on an x86 system and using Linux 3.1.x through 4.3.x as the driver domain, allows local guest ad
The PCI backend driver in Xen, when running on an x86 system and using Linux 3.1.x through 4.3.x as the driver domain, allows local guest administrators to hit BUG conditions and cause a denial of service (NULL pointer dereference and host OS crash) by leveraging a system with access to a passed-through MSI or MSI-X capable physical PCI device and a crafted sequence of XEN_PCI_OP_* operations, aka "Linux pciback missing sanity checks."
- Published
- Apr 13, 2016
- Updated
- Jun 16, 2026
- EPSS
- 0.5% · 37th percentile
- CWE
- CWE-476
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Report tools
Action score
24
Monitor
Low priority for now.
- CVSS
- 24 / 40 · 6.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| opensuse | opensuse | cpe:2.3:o:opensuse:opensuse |
| suse | linux enterprise desktop | cpe:2.3:o:suse:linux_enterprise_desktop |
| suse | linux enterprise real time extension | cpe:2.3:o:suse:linux_enterprise_real_time_extension |
| suse | linux enterprise server | cpe:2.3:o:suse:linux_enterprise_server |
| suse | linux enterprise software development kit | cpe:2.3:o:suse:linux_enterprise_software_development_kit |
| suse | linux enterprise workstation extension | cpe:2.3:o:suse:linux_enterprise_workstation_extension |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux7.0
- debian debian linux8.0
- linux linux kernel4.3.0 and later · up to 4.3.6 inclusive
- linux linux kernel3.1 and later · up to 3.1.10 inclusive
- opensuse opensuse13.1
- suse linux enterprise desktop11
- suse linux enterprise desktop12
- suse linux enterprise real time extension11
- suse linux enterprise real time extension12
- suse linux enterprise server11
- suse linux enterprise server12
- suse linux enterprise software development kit11
- suse linux enterprise software development kit12
- suse linux enterprise workstation extension12
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 4.3.3-3 | 4.3.3-3 |
| Debian:7 | linux | before 3.2.73-2+deb7u2 | 3.2.73-2+deb7u2 |
| Debian:8 | linux | before 3.16.7-ckt20-1+deb8u2 | 3.16.7-ckt20-1+deb8u2 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-default | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-pae | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-source | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-syms | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-trace | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-xen | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 12 | kernel-default | before 3.12.51-52.34.1 | 3.12.51-52.34.1 |
| SUSE:Linux Enterprise Desktop 12 | kernel-source | before 3.12.51-52.34.1 | 3.12.51-52.34.1 |
| SUSE:Linux Enterprise Desktop 12 | kernel-syms | before 3.12.51-52.34.1 | 3.12.51-52.34.1 |
| SUSE:Linux Enterprise Desktop 12 | kernel-xen | before 3.12.51-52.34.1 | 3.12.51-52.34.1 |
| SUSE:Linux Enterprise Desktop 12 SP1 | kernel-default | before 3.12.62-60.62.1 | 3.12.62-60.62.1 |
| SUSE:Linux Enterprise Desktop 12 SP1 | kernel-default | before 3.12.53-60.30.1 | 3.12.53-60.30.1 |
| SUSE:Linux Enterprise Desktop 12 SP1 | kernel-source | before 3.12.62-60.62.1 | 3.12.62-60.62.1 |
| SUSE:Linux Enterprise Desktop 12 SP1 | kernel-source | before 3.12.53-60.30.1 | 3.12.53-60.30.1 |
| SUSE:Linux Enterprise Desktop 12 SP1 | kernel-syms | before 3.12.53-60.30.1 | 3.12.53-60.30.1 |
| SUSE:Linux Enterprise Desktop 12 SP1 | kernel-syms | before 3.12.62-60.62.1 | 3.12.62-60.62.1 |
| SUSE:Linux Enterprise Desktop 12 SP1 | kernel-xen | before 3.12.53-60.30.1 | 3.12.53-60.30.1 |
| SUSE:Linux Enterprise Desktop 12 SP1 | kernel-xen | before 3.12.62-60.62.1 | 3.12.62-60.62.1 |
| SUSE:Linux Enterprise Live Patching 12 | kgraft-patch-SLE12_Update_10 | before 1-2.1 | 1-2.1 |
| SUSE:Linux Enterprise Live Patching 12 | kgraft-patch-SLE12-SP1_Update_3 | before 1-2.1 | 1-2.1 |
| SUSE:Linux Enterprise Live Patching 12 | kgraft-patch-SLE12-SP1_Update_7 | before 1-4.2 | 1-4.2 |
+41
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
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:linux | 4.3.3-3 · Debian:12 | Package registry (OSV) |
| suse:kernel-default | 3.12.51-52.34.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:kernel-docs | 3.12.51-52.34.3 · SUSE:Linux Enterprise Software Development Kit 12 | Package registry (OSV) |
| suse:kernel-ec2 | 3.12.51-52.34.1 · SUSE:Linux Enterprise Module for Public Cloud 12 | Package registry (OSV) |
| suse:kernel-obs-build | 3.12.51-52.34.1 · SUSE:Linux Enterprise Software Development Kit 12 | Package registry (OSV) |
| suse:kernel-pae | 3.0.101-71.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
| suse:kernel-source | 3.12.51-52.34.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:kernel-syms | 3.12.51-52.34.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:kernel-trace | 3.0.101-71.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
| suse:kernel-xen | 3.12.51-52.34.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:kgraft-patch-SLE12_Update_10 | 1-2.1 · SUSE:Linux Enterprise Live Patching 12 | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP1_Update_3 | 1-2.1 · SUSE:Linux Enterprise Live Patching 12 | Package registry (OSV) |
| suse:lttng-modules | 2.7.0-3.1 · SUSE:Linux Enterprise Server 12 SP1 | 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
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- Administrator privileges are required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/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
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
- lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
- lists.opensuse.org/opensuse-security-announce/2016-06/msg00059.html
- lists.opensuse.org/opensuse-security-announce/2016-07/msg00005.html
- lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html
- lists.opensuse.org/opensuse-security-announce/2016-08/msg00044.html
- lists.opensuse.org/opensuse-security-announce/2016-08/msg00055.html
- www.debian.org/security/2016/dsa-3434
- www.securityfocus.com/bid/79546
- www.securitytracker.com/id/1034480
- xenbits.xen.org/xsa/advisory-157.html
- security.gentoo.org/glsa/201604-03
Vendor advisories and official records. Exploit/PoC links are deliberately left out.