Vulnerability-Lookup

RHSA-2020:0666

Vulnerability from csaf_redhat - Published: 2020-03-03 15:24 - Updated: 2026-11-07 05:20

Summary

Red Hat Security Advisory: qemu-kvm security and enhancement update

Severity

Moderate

Notes

Topic: An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM. Security Fix(es): * hw: TSX Transaction Asynchronous Abort (TAA) (CVE-2019-11135) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Enhancement(s): * [Intel 7.8 FEAT] MDS_NO exposure to guest - qemu-kvm (BZ#1755332)

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2019-11135

A flaw was found in the way Intel CPUs handle speculative execution of instructions when the TSX Asynchronous Abort (TAA) error occurs. A local authenticated attacker with the ability to monitor execution times could infer the TSX memory state by comparing abort execution times. This could allow information disclosure via this observed side-channel for any TSX transaction being executed while an attacker is able to observe abort timing. Intel's Transactional Synchronisation Extensions (TSX) are set of instructions which enable transactional memory support to improve performance of the multi-threaded applications, in the lock-protected critical sections. The CPU executes instructions in the critical-sections as transactions, while ensuring their atomic state. When such transaction execution is unsuccessful, the processor cannot ensure atomic updates to the transaction memory, so the processor rolls back or aborts such transaction execution. While TSX Asynchronous Abort (TAA) is pending, CPU may continue to read data from architectural buffers and pass it to the dependent speculative operations. This may cause information leakage via speculative side-channel means, which is quite similar to the Microarchitectural Data Sampling (MDS) issue.

6.5 (Medium)


                
                  CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CWE-385 - Covert Timing Channel

Affected products

Fixed 12 products

Product	Version	Remediation
Unresolved product id: 7ComputeNode-optional-7.6.EUS:qemu-img-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7ComputeNode-optional-7.6.EUS:qemu-kvm-10:1.5.3-160.el7_6.5.src	—	Vendor Fix fix Workaround
Unresolved product id: 7ComputeNode-optional-7.6.EUS:qemu-kvm-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7ComputeNode-optional-7.6.EUS:qemu-kvm-common-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7ComputeNode-optional-7.6.EUS:qemu-kvm-debuginfo-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7ComputeNode-optional-7.6.EUS:qemu-kvm-tools-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.6.EUS:qemu-img-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.6.EUS:qemu-kvm-10:1.5.3-160.el7_6.5.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.6.EUS:qemu-kvm-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.6.EUS:qemu-kvm-common-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.6.EUS:qemu-kvm-debuginfo-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.6.EUS:qemu-kvm-tools-10:1.5.3-160.el7_6.5.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2020:0666	self
https://access.redhat.com/security/updates/classi…	external
https://access.redhat.com/solutions/tsx-asynchron…	external
https://bugzilla.redhat.com/show_bug.cgi?id=1753062	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2019-11135	self
https://bugzilla.redhat.com/show_bug.cgi?id=1753062	external
https://www.cve.org/CVERecord?id=CVE-2019-11135	external
https://nvd.nist.gov/vuln/detail/CVE-2019-11135	external
https://access.redhat.com/solutions/tsx-asynchron…	external
https://www.intel.com/content/www/us/en/security-…	external

Acknowledgments

Intel

JSON

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      "cve": "CVE-2019-11135",
      "cwe": {
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        "name": "Covert Timing Channel"
      },
      "discovery_date": "2019-09-18T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way Intel CPUs handle speculative execution of instructions when the TSX Asynchronous Abort (TAA) error occurs. A local authenticated attacker with the ability to monitor execution times could infer the TSX memory state by comparing abort execution times. This could allow information disclosure via this observed side-channel for any TSX transaction being executed while an attacker is able to observe abort timing.\r\n\r\nIntel\u0027s Transactional Synchronisation Extensions (TSX) are set of instructions which enable transactional memory support to improve performance of the multi-threaded applications, in the lock-protected critical sections. The CPU executes instructions in the critical-sections as transactions, while ensuring their atomic state. When such transaction execution is unsuccessful, the processor cannot ensure atomic updates to the transaction memory, so the processor rolls back or aborts such transaction execution.\r\n\r\nWhile TSX Asynchronous Abort (TAA) is pending, CPU may continue to read data from architectural buffers and pass it to the dependent speculative operations. This may cause information leakage via speculative side-channel means, which is quite similar to the Microarchitectural Data Sampling (MDS) issue.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "hw: TSX Transaction Asynchronous Abort (TAA)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "libvirt and qemu-kvm on Red Hat Enterprise Linux 6 are not affected by this vulnerability as they do not support MSR-based CPU features.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "category": "impact",
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      ],
      "title": "hw: TSX Transaction Asynchronous Abort (TAA)"
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  ]
}

CVE-2019-11135 (GCVE-0-2019-11135)

Vulnerability from cvelistv5 – Published: 2019-11-14 18:19 – Updated: 2026-05-28 18:21

Summary

TSX Asynchronous Abort condition on some CPUs utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-28 18:20 UTC

CWE

Information Disclosure
CWE-noinfo Not enough information

Assigner

intel CNA under the mitre root

CNA scorecard C 60/100 over 96 records in the last 180 days details

References

30 references

URL	Tags
https://seclists.org/bugtraq/2019/Nov/26	mailing-listx_refsource_BUGTRAQ
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://access.redhat.com/errata/RHSA-2019:3936	vendor-advisoryx_refsource_REDHAT
https://usn.ubuntu.com/4186-2/	vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
http://www.openwall.com/lists/oss-security/2019/12/10/3	mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2019/12/10/4	mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2019/12/11/1	mailing-listx_refsource_MLIST
https://seclists.org/bugtraq/2019/Dec/28	mailing-listx_refsource_BUGTRAQ
https://lists.debian.org/debian-lts-announce/2019…	mailing-listx_refsource_MLIST
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
https://access.redhat.com/errata/RHSA-2020:0026	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0028	vendor-advisoryx_refsource_REDHAT
https://www.debian.org/security/2020/dsa-4602	vendor-advisoryx_refsource_DEBIAN
https://seclists.org/bugtraq/2020/Jan/21	mailing-listx_refsource_BUGTRAQ
https://access.redhat.com/errata/RHSA-2020:0204	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0279	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0366	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0555	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0666	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0730	vendor-advisoryx_refsource_REDHAT
https://security.gentoo.org/glsa/202003-56	vendor-advisoryx_refsource_GENTOO
https://www.oracle.com/security-alerts/cpujan2021.html	x_refsource_MISC
https://www.intel.com/content/www/us/en/security-…	x_refsource_MISC
https://support.f5.com/csp/article/K02912734?utm_…	x_refsource_CONFIRM
http://packetstormsecurity.com/files/155375/Slack…	x_refsource_MISC
https://support.hpe.com/hpsc/doc/public/display?d…	x_refsource_CONFIRM
https://kc.mcafee.com/corporate/index?page=conten…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
n/a	2019.2 IPU – TSX Asynchronous Abort	Affected: See provided reference

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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