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Execution with Unnecessary Privileges

CVE-2017-7518

Medium
5.5/10

Summary

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.

  • LOW
  • ADJACENT_NETWORK
  • LOW
  • UNCHANGED
  • NONE
  • LOW
  • LOW
  • LOW

CWE-250 - Execution with Unnecessary Privileges

The software 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.

References

Advisory Timeline

  • Published