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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel KVM Hypervisor Debug Exception Handling Flaw Lets Local Guest Users Deny Service or Gain Elevated Privileges on the Guest System
SecurityTracker Alert ID:  1040862
SecurityTracker URL:  http://securitytracker.com/id/1040862
CVE Reference:   CVE-2018-1087   (Links to External Site)
Date:  May 9 2018
Impact:   Denial of service via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel KVM hypervisor. A local user on the guest system can cause denial of service conditions on the guest system. A local user on the guest system can gain elevated privileges on the guest system.

The Linux kernel's KVM hypervisor does not properly handle debug exceptions delivered after a stack switch operation via mov SS or pop SS instructions. During the stack switch operation, the exceptions are deferred. As a result, a local user on the KVM guest system can cause the guest system to crash or gain elevated privileges on the guest system.

Andy Lutomirski reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the guest system.

A local user on the guest system can gain elevated privileges on the guest system.

Solution:   The vendor has issued a source code fix, available at:

https://github.com/torvalds/linux/commit/32d43cd391bacb5f0814c2624399a5dad3501d09

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   State error

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 9 2018 (Ubuntu Issues Fix) Linux Kernel KVM Hypervisor Debug Exception Handling Flaw Lets Local Guest Users Deny Service or Gain Elevated Privileges on the Guest System
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 17.10.
May 9 2018 (Ubuntu Issues Fix) Linux Kernel KVM Hypervisor Debug Exception Handling Flaw Lets Local Guest Users Deny Service or Gain Elevated Privileges on the Guest System
Ubuntu has issued a fix for Ubuntu Linux 12.04 ESM.
May 9 2018 (Oracle Issues Fix for Oracle Linux) Linux Kernel KVM Hypervisor Debug Exception Handling Flaw Lets Local Guest Users Deny Service or Gain Elevated Privileges on the Guest System
Oracle has issued a fix for Oracle Linux 7.
May 16 2018 (Red Hat Issues Fix for Red Hat Enterprise Virtualization) Linux Kernel KVM Hypervisor Debug Exception Handling Flaw Lets Local Guest Users Deny Service or Gain Elevated Privileges on the Guest System
Red Hat has issued a fix for Red Hat Enterprise Virtualization for Red Hat Enterprise Linux 7.
May 24 2018 (Oracle Issues Fix for Oracle Linux) Linux Kernel KVM Hypervisor Debug Exception Handling Flaw Lets Local Guest Users Deny Service or Gain Elevated Privileges on the Guest System
Oracle has issued a fix for Oracle Linux 7.



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