VYPR
← All advisories
Medium severity5.5NVD Advisory· Published Jul 13, 2020· Updated Jun 17, 2026

CVE-2019-19338

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

113

Patches

Vulnerability mechanics

References

3

News mentions

0

No linked articles in our index yet.