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CVE-2019-19338

MEDIUM

5.5

Description

A flaw was found in the fix for CVE-2019-11135, in the Linux upstream kernel versions before 5.5 where, the way Intel CPUs handle speculative execution of instructions when a TSX Asynchronous Abort (TAA) error occurs. When a guest is running on a host CPU affected by the TAA flaw (TAA_NO=0), but is not affected by the MDS issue (MDS_NO=1), the guest was to clear the affected buffers by using a VERW instruction mechanism. But when the MDS_NO=1 bit was exported to the guests, the guests did not use the VERW mechanism to clear the affected buffers. This issue affects guests running on Cascade Lake CPUs and requires that host has 'TSX' enabled. Confidentiality of data is the highest threat associated with this vulnerability.

CVE Details

CVSS v3.1 Score5.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published7/13/2020

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

linux:linux_kernelredhat:enterprise_linux

Weaknesses (CWE)

CWE-203CWE-385CWE-203

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19338(secalert@redhat.com)

https://software.intel.com/security-software-guidance/insights/deep-dive-intel-transactional-synchronization-extensions-intel-tsx-asynchronous-abort(secalert@redhat.com)

https://www.openwall.com/lists/oss-security/2019/12/10/3(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19338(af854a3a-2127-422b-91ae-364da2661108)

https://software.intel.com/security-software-guidance/insights/deep-dive-intel-transactional-synchronization-extensions-intel-tsx-asynchronous-abort(af854a3a-2127-422b-91ae-364da2661108)

https://www.openwall.com/lists/oss-security/2019/12/10/3(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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