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Rewterz Threat Advisory – CVE-2018-16882 – Linux Kernel KVM “nested_get_vmcs12_pages()” UseAfter-Free Vulnerability

SEVERITY: Medium

 

 

CATEGORY: Vulnerability

 

 

ANALYSIS SUMMARY

A use-after-free issue was found in the way Linux kernel’s KVM hypervisor processed posted interrupts, when nested(=1) virtualization is enabled. Innested_get_vmcs12_pages(). In case of an error while processing posted interrupt address, it unmaps the ‘pi_desc_page’ without resetting ‘pi_desc’ descriptor address. Which is later used in pi_test_and_clear_on().

A guest user/process could use this flaw to crash the host kernel resulting in DoS.

 

 

IMPACT

 

System access or Dos (Denial of Service) in guest virtual machine.

 

 

AFFECTED PRODUCTS

 

  • Linux Kernel 3.16.62
  • Linux Kernel 4.4.168
  • Linux Kernel 4.9.146
  • Linux Kernel 4.14.89
  • Linux Kernel 4.19.10

 

 

REMEDIATION

 

Upstream patch can be followed from the following link.
(Note: This is a third-party patch, whereas the vendor has not released any patches for this vulnerability so far.)
https://marc.info/?l=kvm&m=154514994222809&w=2

 

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