A flaw was found in the Linux kernel before version...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://access.redhat.com/errata/RHSA-2018:0412
- https://access.redhat.com/articles/3290921
- https://usn.ubuntu.com/3619-2/
- https://access.redhat.com/errata/RHSA-2018:0395
- https://usn.ubuntu.com/3754-1/
- http://www.securitytracker.com/id/1038782
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518
- http://www.openwall.com/lists/oss-security/2017/06/23/5
- https://usn.ubuntu.com/3619-1/
- https://www.debian.org/security/2017/dsa-3981
- https://www.spinics.net/lists/kvm/msg151817.html
- http://www.securityfocus.com/bid/99263
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