CVE-2019-19338

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Summary

CVECVE-2019-19338
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-07-13 17:15:00 UTC
Updated2020-07-21 17:17:00 UTC
DescriptionA 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 And Classification

Problem Types: CWE-203

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel All All All All
Operating System Redhat Enterprise Linux 6.0 All All All
Operating System Redhat Enterprise Linux 6.0 All All All

References

ReferenceSourceLinkTags
Deep Dive: Intel® Transactional Synchronization Extensions (Intel® TSX) Asynchronous Abort MISC software.intel.com Third Party Advisory
1781514 – (CVE-2019-19338) CVE-2019-19338 Kernel: KVM: export MSR_IA32_TSX_CTRL to guest - incomplete fix for TAA (CVE-2019-11135) CONFIRM bugzilla.redhat.com Issue Tracking, Patch, Third Party Advisory
oss-security - CVE-2019-19338 Kernel: KVM: export MSR_IA32_TSX_CTRL to guest - incomplete fix for TAA (CVE-2019-11135) MISC www.openwall.com Mailing List, Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 670185 EulerOS Security Update for kernel (EulerOS-SA-2021-1684)
  • 900076 CBL-Mariner Linux Security Update for kernel 5.4.91
  • 903502 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (3497)
  • 905944 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (3497-1)
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