CVE-2019-19338
First published: Mon Nov 18 2019(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| IBM Data Risk Manager | <=2.0.6 | |
| Linux Linux kernel | <5.5 | |
| Redhat Enterprise Linux | =6.0 | |
| redhat/kernel-rt | <0:3.10.0-1062.18.1.rt56.1044.el7 | 0:3.10.0-1062.18.1.rt56.1044.el7 |
| redhat/kernel | <0:3.10.0-1062.18.1.el7 | 0:3.10.0-1062.18.1.el7 |
| redhat/kernel | <0:3.10.0-957.48.1.el7 | 0:3.10.0-957.48.1.el7 |
| redhat/kernel-rt | <0:4.18.0-147.5.1.rt24.98.el8_1 | 0:4.18.0-147.5.1.rt24.98.el8_1 |
| redhat/kernel | <0:4.18.0-147.5.1.el8_1 | 0:4.18.0-147.5.1.el8_1 |
Remedy
Please refer to the Red Hat Knowledgebase Transactional Synchronization Extensions (TSX) Asynchronous Abort article (https://access.redhat.com/solutions/tsx-asynchronousabort) for mitigation instructions.
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Reference Links
- https://exchange.xforce.ibmcloud.com/vulnerabilities/172836
- https://www.ibm.com/support/pages/node/6335281 (Advisory)
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19338
- https://software.intel.com/security-software-guidance/insights/deep-dive-intel-transactional-synchronization-extensions-intel-tsx-asynchronous-abort
- https://www.openwall.com/lists/oss-security/2019/12/10/3
- https://git.kernel.org/linus/cbbaa2727aa3ae9e0a844803da7cef7fd3b94f2b
- https://git.kernel.org/linus/c11f83e0626bdc2b6c550fc8b9b6eeefbd8cefaa
- https://git.kernel.org/linus/b07a5c53d42a8c87b208614129e947dd2338ff9c
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1781527
- https://access.redhat.com/solutions/tsx-asynchronousabort
- https://access.redhat.com/errata/RHSA-2020:0328
- https://access.redhat.com/errata/RHSA-2020:0339
- https://access.redhat.com/security/cve/cve-2019-19338
- https://access.redhat.com/errata/RHSA-2020:0834
- https://access.redhat.com/errata/RHSA-2020:0839
- https://access.redhat.com/errata/RHSA-2020:1465
- https://bugzilla.redhat.com/show_bug.cgi?id=1781514
- https://www.cve.org/CVERecord?id=CVE-2019-19338 https://nvd.nist.gov/vuln/detail/CVE-2019-19338 https://software.intel.com/security-software-guidance/insights/deep-dive-intel-transactional-synchronization-extensions-intel-tsx-asynchronous-abort https://www.openwall.com/lists/oss-security/2019/12/10/3
Parent vulnerabilities
(Appears in the following advisories)
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/weakness
- agent/first-publish-date
- agent/last-modified-date
- agent/softwarecombine
- agent/author
- agent/severity
- agent/references
- agent/remedy
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2019-19338
- agent/software-canonical-lookup
- agent/event
- collector/ibm-support
- source/IBM
- agent/tags
- agent/description
- collector/mitre-cve
- source/MITRE
- package-manager/redhat
- vendor/linux
- canonical/linux linux kernel
- vendor/redhat
- canonical/redhat enterprise linux
- version/redhat enterprise linux/6.0
- vendor/ibm
- canonical/ibm data risk manager
- version/ibm data risk manager/2.0.6