A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the
A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs.
- Published
- May 8, 2018
- Updated
- Jun 16, 2026
- EPSS
- 18.5% · 97th percentile
- CWE
- CWE-362
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Report tools
Action score
37
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 6 / 30 · 18.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
| redhat | enterprise virtualization manager | cpe:2.3:o:redhat:enterprise_virtualization_manager |
| citrix | xenserver | cpe:2.3:a:citrix:xenserver |
| synology | skynas | cpe:2.3:a:synology:skynas |
| synology | diskstation manager | cpe:2.3:o:synology:diskstation_manager |
| apple | mac os x | cpe:2.3:o:apple:mac_os_x |
| xen | xen | cpe:2.3:o:xen:xen |
| freebsd | freebsd | cpe:2.3:o:freebsd:freebsd |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apple mac os xbefore 10.13.4
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux17.10
- citrix xenserver6.0.2
- citrix xenserver6.2.0
- citrix xenserver6.5
- citrix xenserver7.0
- citrix xenserver7.1
- citrix xenserver7.2
- citrix xenserver7.3
- citrix xenserver7.4
- debian debian linux7.0
- debian debian linux8.0
- debian debian linux9.0
- freebsd freebsd11.0 and later · before 11.1
- redhat enterprise linux server7.0
- redhat enterprise linux workstation7.0
- redhat enterprise virtualization manager3.0
- synology diskstation manager5.2
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | xen | before 4.10.1-r1 | 4.10.1-r1 |
| Alpine:v3.4 | xen | before 4.6.6-r5 | 4.6.6-r5 |
| Alpine:v3.5 | xen | before 4.7.3-r9 | 4.7.3-r9 |
| Alpine:v3.6 | xen | before 4.8.3-r1 | 4.8.3-r1 |
| Alpine:v3.7 | xen | before 4.9.2-r2 | 4.9.2-r2 |
| Debian:12 | linux | before 4.15.17-1 | 4.15.17-1 |
| Debian:12 | xen | before 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6 | 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6 |
| Debian:7 | linux | before 3.2.102-1 | 3.2.102-1 |
| Debian:7 | xen | before 4.1.6.lts1-14 | 4.1.6.lts1-14 |
| Debian:8 | linux | before 3.16.56-1+deb8u1 | 3.16.56-1+deb8u1 |
| Debian:8 | xen | before 4.4.4lts4-0+deb8u1 | 4.4.4lts4-0+deb8u1 |
| Debian:9 | linux | before 4.9.88-1+deb9u1 | 4.9.88-1+deb9u1 |
| Red Hat:enterprise_linux:6::client | kernel | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-abi-whitelists | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-debug | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-debug-debuginfo | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-debug-devel | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-debuginfo | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-debuginfo-common-i686 | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-debuginfo-common-x86_64 | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-devel | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-doc | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-firmware | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
| Red Hat:enterprise_linux:6::client | kernel-headers | before 0:2.6.32-696.28.1.el6 | 0:2.6.32-696.28.1.el6 |
+96
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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 |
|---|---|---|
| alpine:xen | 4.10.1-r1 · Alpine:v3.10 | Package registry (OSV) |
| debian:linux | 4.15.17-1 · Debian:12 | Package registry (OSV) |
| debian:xen | 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6 · Debian:12 | Package registry (OSV) |
| red hat:kernel | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-abi-whitelists | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debug | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debuginfo | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debuginfo-common-x86_64 | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-devel | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-doc | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-headers | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-tools | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-tools-debuginfo | 0:3.10.0-862.2.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:kernel-bigmem | 3.0.101-108.41.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-bigsmp | 3.0.101-0.47.106.22.1 · SUSE:Linux Enterprise Server 11 SP3-LTSS | Package registry (OSV) |
| suse:kernel-default | 3.0.101-108.41.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-docs | 3.0.101-108.41.1 · SUSE:Linux Enterprise Software Development Kit 11 SP4 | Package registry (OSV) |
| suse:kernel-ec2 | 3.0.101-108.41.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-pae | 3.0.101-108.41.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-ppc64 | 3.0.101-108.41.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-source | 3.0.101-108.41.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-syms | 3.0.101-108.41.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-trace | 3.0.101-108.41.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-xen | 3.0.101-108.41.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP2_Update_21 | 1-3.3.1 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
- Exploit-DB entry ×3
- Proof-of-concept repository on GitHub ×4
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | local | 2018-05-22 |
| Exploit-DB entry | local | 2018-07-13 |
| Exploit-DB entry | local | 2018-07-13 |
| Metasploit module | exploit/windows/local/mov_ssMicrosoft Windows POP/MOV SS Local Privilege Elevation Vulnerabilityexploit | 2018-05-08 |
| Proof-of-concept repository on GitHub | stars:81 | 2018-05-10 |
| Proof-of-concept repository on GitHub | stars:4 | 2018-05-13 |
| Proof-of-concept repository on GitHub | stars:424 | 2018-05-13 |
| Proof-of-concept repository on GitHub | stars:119 | 2018-08-08 |
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.
- Metasploit-1 d
- Published
- First PoC+1 d
- TodaySep 30, 2026+3067 d
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.
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.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')CVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/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.
Attack patterns (CAPEC)
ATT&CK techniques
—
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
- www.kb.cert.org/vuls/id/631579
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9
- openwall.com/lists/oss-security/2018/05/08/1
- openwall.com/lists/oss-security/2018/05/08/4
- www.huawei.com/en/psirt/security-advisories/huawei-sa-20190921-01-debug-en
- www.securityfocus.com/bid/104071
- www.securitytracker.com/id/1040744
- www.securitytracker.com/id/1040849
- www.securitytracker.com/id/1040861
- www.securitytracker.com/id/1040866
- www.securitytracker.com/id/1040882
- access.redhat.com/errata/RHSA-2018:1318
- access.redhat.com/errata/RHSA-2018:1319
- access.redhat.com/errata/RHSA-2018:1345
- access.redhat.com/errata/RHSA-2018:1346
- access.redhat.com/errata/RHSA-2018:1347
- access.redhat.com/errata/RHSA-2018:1348
- access.redhat.com/errata/RHSA-2018:1349
- access.redhat.com/errata/RHSA-2018:1350
- access.redhat.com/errata/RHSA-2018:1351
Vendor advisories and official records. Exploit/PoC links are deliberately left out.