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CVE-2019-19338

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.

Risk Information

Base Score
5.5
MODERATE
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS Score
Exploitation Probability
0.091

Associated Vulnerability

VulnerabilityOS Platform
SUSE-SU-2019:3316-1(SUSE Linux Enterprise Server 12-SP4 ) kernel-azure-4.12.14-6.34.1.x86_64.rpmLinux
SUSE-SU-2019:3316-1(SUSE Linux Enterprise Server 12-SP4 ) kernel-azure-base-4.12.14-6.34.1.x86_64.rpmLinux
SUSE-SU-2019:3316-1(SUSE Linux Enterprise Server 12-SP4 ) kernel-azure-base-debuginfo-4.12.14-6.34.1.x86_64.rpmLinux
SUSE-SU-2019:3316-1(SUSE Linux Enterprise Server 12-SP4 ) kernel-azure-debuginfo-4.12.14-6.34.1.x86_64.rpmLinux
SUSE-SU-2019:3316-1(SUSE Linux Enterprise Server 12-SP4 ) kernel-azure-debugsource-4.12.14-6.34.1.x86_64.rpmLinux
SUSE-SU-2019:3316-1(SUSE Linux Enterprise Server 12-SP4 ) kernel-azure-devel-4.12.14-6.34.1.x86_64.rpmLinux
SUSE-SU-2019:3316-1(SUSE Linux Enterprise Server 12-SP4 ) kernel-devel-azure-4.12.14-6.34.1.noarch.rpmLinux
SUSE-SU-2019:3316-1(SUSE Linux Enterprise Server 12-SP4 ) kernel-source-azure-4.12.14-6.34.1.noarch.rpmLinux
SUSE-SU-2019:3316-1(SUSE Linux Enterprise Server 12-SP4 ) kernel-syms-azure-4.12.14-6.34.1.x86_64.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-default-4.12.14-122.12.1.x86_64.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-default-base-4.12.14-122.12.1.x86_64.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-default-base-debuginfo-4.12.14-122.12.1.x86_64.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-default-debuginfo-4.12.14-122.12.1.x86_64.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-default-debugsource-4.12.14-122.12.1.x86_64.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-default-devel-4.12.14-122.12.1.x86_64.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-default-devel-debuginfo-4.12.14-122.12.1.x86_64.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-devel-4.12.14-122.12.1.noarch.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-macros-4.12.14-122.12.1.noarch.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-source-4.12.14-122.12.1.noarch.rpmLinux
SUSE-SU-2019:3389-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-syms-4.12.14-122.12.1.x86_64.rpmLinux
SUSE-SU-2020:0093-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-azure-4.12.14-16.7.1.x86_64.rpmLinux
SUSE-SU-2020:0093-1(SUSE Linux Enterprise Server 12-SP5 ) kernel-azure-base-4.12.14-16.7.1.x86_64.rpmLinux
Observable Discrepancy Vulnerability (CVE-2019-19338)NCM

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234