high
7.8
CWE
755 250
Advisory Published
CVE Published
Updated

CVE-2017-7518

First published: Fri Jun 23 2017(Updated: )

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.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
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
redhat/kernel<4.12
4.12
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.12.5-1
6.12.6-1

Remedy

http://www.openwall.com/lists/oss-security/2017/06/23/5

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518

Remedy

https://www.spinics.net/lists/kvm/msg151817.html

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Reference Links

Frequently Asked Questions

  • What is CVE-2017-7518?

    CVE-2017-7518 is a vulnerability found in the Linux kernel before version 4.12 that affects the KVM module.

  • What is the severity of CVE-2017-7518?

    CVE-2017-7518 has a severity level of medium.

  • Which Linux kernel versions are affected by CVE-2017-7518?

    Linux kernel versions before 4.12 are affected by CVE-2017-7518.

  • How can CVE-2017-7518 be exploited?

    CVE-2017-7518 can be exploited by a user or process inside a guest using the trap flag (TF) bit in EFLAGS during the emulation of the syscall instruction.

  • Is there a fix available for CVE-2017-7518?

    Yes, the fix for CVE-2017-7518 is available in the Linux kernel version 4.12 and later.

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