Microarchitectural Data Sampling Uncacheable Memory (MDSUM): Uncacheable memory on some microprocessors utilizing speculative execution may
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
- BDU:2019-01957
- DLA-1787-1
- DLA-1789-1
- DLA-1789-2
- DLA-1799-1
- DSA-4444-1
- DSA-4447-1
- openSUSE-SU-2019:1402-1
- openSUSE-SU-2019:1403-1
- openSUSE-SU-2019:1404-1
- openSUSE-SU-2019:1405-1
- openSUSE-SU-2019:1468-1
- openSUSE-SU-2019:1505-1
- openSUSE-SU-2019:1805-1
- openSUSE-SU-2019:1806-1
- RHSA-2019:1155
- RHSA-2019:1167
- RHSA-2019:1168
- RHSA-2019:1169
- RHSA-2019:1170
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- May 30, 2019
- Updated
- Jun 16, 2026
- EPSS
- 0.6% · 47th percentile
- CWE
- —
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.6 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| intel | microarchitectural data sampling uncacheable memory firmware | cpe:2.3:o:intel:microarchitectural_data_sampling_uncacheable_memory_firmware |
| intel | microarchitectural data sampling uncacheable memory | cpe:2.3:h:intel:microarchitectural_data_sampling_uncacheable_memory |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fedoraproject fedora29
- intel microarchitectural data sampling uncacheable memory firmwareall versions
Versions reported by the vendor
Affected version ranges reported by the assigning authority (intel). Independent of NVD's CPE analysis and usually ahead of it.
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.pdfaffected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | xen | before 4.12.0-r2 | 4.12.0-r2 |
| Alpine:v3.7 | xen | before 4.9.4-r1 | 4.9.4-r1 |
| Alpine:v3.8 | xen | before 4.10.3-r1 | 4.10.3-r1 |
| Alpine:v3.9 | xen | before 4.11.1-r2 | 4.11.1-r2 |
| Debian:12 | intel-microcode | before 3.20190514.1 | 3.20190514.1 |
| Debian:12 | linux | before 4.19.37-2 | 4.19.37-2 |
| Debian:12 | xen | before 4.11.1+92-g6c33308a8d-1 | 4.11.1+92-g6c33308a8d-1 |
| Debian:8 | intel-microcode | before 3.20190514.1~deb8u1 | 3.20190514.1~deb8u1 |
| Debian:8 | intel-microcode | before 3.20190618.1~deb8u1 | 3.20190618.1~deb8u1 |
| Debian:8 | linux | before 3.16.68-1 | 3.16.68-1 |
| Debian:8 | linux-4.9 | before 4.9.168-1+deb9u2~deb8u1 | 4.9.168-1+deb9u2~deb8u1 |
| Debian:9 | intel-microcode | before 3.20190514.1~deb9u1 | 3.20190514.1~deb9u1 |
| Debian:9 | linux | before 4.9.168-1+deb9u2 | 4.9.168-1+deb9u2 |
| openSUSE:Leap 15.0 | kernel-debug | before 4.12.14-lp150.12.61.1 | 4.12.14-lp150.12.61.1 |
| openSUSE:Leap 15.0 | kernel-default | before 4.12.14-lp150.12.61.1 | 4.12.14-lp150.12.61.1 |
| openSUSE:Leap 15.0 | kernel-docs | before 4.12.14-lp150.12.61.1 | 4.12.14-lp150.12.61.1 |
| openSUSE:Leap 15.0 | kernel-kvmsmall | before 4.12.14-lp150.12.61.1 | 4.12.14-lp150.12.61.1 |
| openSUSE:Leap 15.0 | kernel-obs-build | before 4.12.14-lp150.12.61.1 | 4.12.14-lp150.12.61.1 |
| openSUSE:Leap 15.0 | kernel-obs-qa | before 4.12.14-lp150.12.61.1 | 4.12.14-lp150.12.61.1 |
| openSUSE:Leap 15.0 | kernel-source | before 4.12.14-lp150.12.61.1 | 4.12.14-lp150.12.61.1 |
| openSUSE:Leap 15.0 | kernel-syms | before 4.12.14-lp150.12.61.1 | 4.12.14-lp150.12.61.1 |
| openSUSE:Leap 15.0 | kernel-vanilla | before 4.12.14-lp150.12.61.1 | 4.12.14-lp150.12.61.1 |
| openSUSE:Leap 15.0 | libvirt | before 4.0.0-lp150.7.14.1 | 4.0.0-lp150.7.14.1 |
| openSUSE:Leap 15.0 | qemu | before 2.11.2-lp150.7.22.1 | 2.11.2-lp150.7.22.1 |
+96
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:xen | 4.12.0-r2 · Alpine:v3.10 | Package registry (OSV) |
| debian:intel-microcode | 3.20190514.1 · Debian:12 | Package registry (OSV) |
| debian:linux | 4.19.37-2 · Debian:12 | Package registry (OSV) |
| debian:linux-4.9 | 4.9.168-1+deb9u2~deb8u1 · Debian:8 | Package registry (OSV) |
| debian:xen | 4.11.1+92-g6c33308a8d-1 · Debian:12 | Package registry (OSV) |
| opensuse:kernel-debug | 4.12.14-lp150.12.61.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:kernel-default | 4.12.14-lp150.12.61.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:kernel-docs | 4.12.14-lp150.12.61.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 4.12.14-lp150.12.61.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:kernel-obs-build | 4.12.14-lp150.12.61.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 4.12.14-lp150.12.61.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:kernel-source | 4.12.14-lp150.12.61.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:kernel-syms | 4.12.14-lp150.12.61.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:kernel-vanilla | 4.12.14-lp150.12.61.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:qemu | 2.11.2-lp150.7.22.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:ucode-intel | 20190507-lp150.2.18.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:xen | 4.10.3_04-lp150.2.19.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| red hat:kernel | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-abi-whitelists | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-debug | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-debuginfo | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-debuginfo-common-x86_64 | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-devel | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-doc | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-tools | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-tools-debuginfo | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| red hat:kernel-tools-libs | 0:3.10.0-862.32.2.el7 · Red Hat:rhel_eus:7.5::computenode | Package registry (OSV) |
| suse:kernel-azure | 4.12.14-5.27.1 · SUSE:Linux Enterprise Module for Public Cloud 15 | Package registry (OSV) |
+11
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2019-06/msg00014.html
- lists.opensuse.org/opensuse-security-announce/2019-07/msg00052.html
- lists.opensuse.org/opensuse-security-announce/2019-07/msg00053.html
- www.arubanetworks.com/assets/alert/ARUBA-PSA-2019-003.txt
- www.huawei.com/en/psirt/security-advisories/huawei-sa-20190712-01-mds-en
- access.redhat.com/errata/RHSA-2019:1455
- access.redhat.com/errata/RHSA-2019:2553
- cert-portal.siemens.com/productcert/pdf/ssa-608355.pdf
- cert-portal.siemens.com/productcert/pdf/ssa-616472.pdf
- kc.mcafee.com/corporate/index?page=content&id=SB10292
- lists.debian.org/debian-lts-announce/2019/06/msg00018.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH73SGTJ575OBCPSJFX6LX7KP2KZIEN4/
- seclists.org/bugtraq/2019/Jun/28
- seclists.org/bugtraq/2019/Jun/36
- seclists.org/bugtraq/2019/Nov/15
- seclists.org/bugtraq/2020/Jan/21
- security.gentoo.org/glsa/202003-56
- usn.ubuntu.com/3977-3/
- www.debian.org/security/2020/dsa-4602
- www.freebsd.org/security/advisories/FreeBSD-SA-19:07.mds.asc
Vendor advisories and official records. Exploit/PoC links are deliberately left out.