CVE-2019-19338
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.
EPSS 0.48% · 39.4th percentile
Risk Scores
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:14.04:LTS | linux-aws | 4.4.0-1110.116, 4.4.0-1117.123, 4.4.0-1090.94 |
| Ubuntu:Pro:14.04:LTS | linux-azure | 0, *, * |
| Ubuntu:Pro:14.04:LTS | linux | 3.13.0-168.218, 3.13.0-7.25, 3.13.0-8.27 |
| Ubuntu:Pro:14.04:LTS | linux-lts-xenial | 4.4.0-124.148~14.04.1, *, * |
| Ubuntu:18.04:LTS | linux-hwe-edge | 5.0.0-15.16~18.04.1, 5.0.0-16.17~18.04.1, 5.0.0-17.18~18.04.1 |
Timeline
- Dec 17, 2019 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 25, 2021 EPSS Score
- Oct 27, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Mar 3, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 5, 2022 EPSS Score
- Jul 7, 2022 EPSS Score
- Sep 9, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2019-19338 third-party-advisory
- https://www.openwall.com/lists/oss-security/2019/12/10/3 third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2019-19338 third-party-advisory