Vulnerability in Linux Kernel
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.007 (50.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Linux Kernel
- [Unknown] Kernel: — versions 4.12
- Canonical Ubuntu Linux — versions 14.04, 16.04
- Debian Linux — versions 8.0, 9.0
- Red Hat Enterprise Linux — versions 7.0
- Red Hat Enterprise Linux Desktop — versions 7.0
- Red Hat Enterprise Linux Server — versions 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.4
- Red Hat Enterprise Linux Server Eus — versions 7.4, 7.5
- Red Hat Enterprise Linux Workstation — versions 7.0
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2018:0412 (vendor-advisory, Third Party Advisory)
- access.redhat.com/articles/3290921 (Permissions Required, Third Party Advisory)
- usn.ubuntu.com/3619-2/ (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:0395 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3754-1/ (vendor-advisory, Third Party Advisory)
- www.securitytracker.com/id/1038782 (VDB Entry, Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- www.openwall.com/lists/oss-security/2017/06/23/5 (mailing-list, Patch, Mailing List, Third Party Advisory)
- usn.ubuntu.com/3619-1/ (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2017/dsa-3981 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-7518?
- CVE-2017-7518 is a medium-severity vulnerability in Linux Kernel, classified under CWE-250. CVSS score: 5.5/10. Published 2018-07-30.
- How severe is CVE-2017-7518?
- Medium severity. CVSS v3 base score is 5.5 out of 10.