CVE-2019-7222

Impact:
Low
Public Date:
2019-02-07
CWE:
CWE-200
Bugzilla:
1671930: CVE-2019-7222 Kernel: KVM: leak of uninitialized stack contents to guest
An information leakage issue was found in the way Linux kernel's KVM hypervisor handled page fault exceptions while emulating instructions like VMXON, VMCLEAR, VMPTRLD, and VMWRITE with memory address as an operand. It occurs if the operand is a mmio address, as the returned exception object holds uninitialized stack memory contents. A guest user/process could use this flaw to leak host's stack memory contents to a guest.

Find out more about CVE-2019-7222 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue does not affect the version of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, and Red Hat Enterprise MRG 2.

This issue affects the versions of Linux kernel as shipped with Red Hat Enterprise Linux 7. Future kernel updates for Red Hat Enterprise Linux 7 may address this issue.

Note:- Impact on Red Hat Enterprise Linux 7 kernel is limited, as it requires that nested virtualization feature is enabled on a system. Nested Virtualization feature is available only as - Technology Preview.

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 2.8
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality Low
Integrity Impact None
Availability Impact None

Affected Packages State

Platform Package State
Red Hat Enterprise MRG 2 kernel-rt Not affected
Red Hat Enterprise Linux 8 kernel Affected
Red Hat Enterprise Linux 8 kernel-rt Affected
Red Hat Enterprise Linux 7 kernel-alt Not affected
Red Hat Enterprise Linux 7 kernel Affected
Red Hat Enterprise Linux 7 kernel-rt Affected
Red Hat Enterprise Linux 6 kernel Not affected
Red Hat Enterprise Linux 5 kernel Not affected

Acknowledgements

Red Hat would like to thank Felix Wilhelm (Google) for reporting this issue.
Last Modified