CVE-2017-7518
MEDIUMCVSS 5.5/10EPSS 0.70%
Last modified
CVE-2017-7518 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. EPSS estimates a 0.70% chance of exploitation in the next 30 days.
Description
A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.
Metrics
CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Enterprise Linux | 7.0 |
| Redhat | Enterprise Linux Desktop | 7.0 |
| Redhat | Enterprise Linux Server | 7.0 |
| Redhat | Enterprise Linux Server Aus | 7.4 |
| Redhat | Enterprise Linux Server Eus | 7.4 |
| Redhat | Enterprise Linux Server Eus | 7.5 |
| Redhat | Enterprise Linux Workstation | 7.0 |
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Debian | Debian Linux | 8.0 |
| Debian | Debian Linux | 9.0 |
| Linux | Linux Kernel | < 4.12 |
References
- http://www.openwall.com/lists/oss-security/2017/06/23/5Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/99263Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038782Third Party Advisory, VDB Entry
- https://access.redhat.com/articles/3290921Permissions Required, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:0395Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:0412Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518Issue Tracking, Patch, Third Party Advisory
- https://usn.ubuntu.com/3619-1/Third Party Advisory
- https://usn.ubuntu.com/3619-2/Third Party Advisory
- https://usn.ubuntu.com/3754-1/Third Party Advisory
- https://www.debian.org/security/2017/dsa-3981Third Party Advisory
- https://www.spinics.net/lists/kvm/msg151817.htmlMailing List, Patch
- http://www.openwall.com/lists/oss-security/2017/06/23/5Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/99263Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038782Third Party Advisory, VDB Entry
- https://access.redhat.com/articles/3290921Permissions Required, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:0395Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:0412Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518Issue Tracking, Patch, Third Party Advisory
- https://usn.ubuntu.com/3619-1/Third Party Advisory
- https://usn.ubuntu.com/3619-2/Third Party Advisory
- https://usn.ubuntu.com/3754-1/Third Party Advisory
- https://www.debian.org/security/2017/dsa-3981Third Party Advisory
- https://www.spinics.net/lists/kvm/msg151817.htmlMailing List, Patch
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2017-7518?
A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.
How severe is CVE-2017-7518?
CVE-2017-7518 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.
How do I fix CVE-2017-7518?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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