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.
The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.
The product does not handle or incorrectly handles an exceptional condition.
| Link | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2018:0412 | third party advisory vendor advisory |
| https://access.redhat.com/articles/3290921 | third party advisory permissions required |
| https://usn.ubuntu.com/3619-2/ | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2018:0395 | third party advisory vendor advisory |
| https://usn.ubuntu.com/3754-1/ | third party advisory vendor advisory |
| http://www.securitytracker.com/id/1038782 | vdb entry third party advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518 | issue tracking third party advisory patch |
| http://www.openwall.com/lists/oss-security/2017/06/23/5 | mailing list third party advisory patch |
| https://usn.ubuntu.com/3619-1/ | third party advisory vendor advisory |
| https://www.debian.org/security/2017/dsa-3981 | third party advisory vendor advisory |
| https://www.spinics.net/lists/kvm/msg151817.html | mailing list patch |
| http://www.securityfocus.com/bid/99263 | vdb entry third party advisory |