Security readout for executives and security teams
Plain-English summary
CVE-2018-12126 is an Intel CPU side-channel issue where a local authenticated user may infer sensitive information from processor store buffers. It is not a remote network attack. Business risk is highest on shared systems, virtualization hosts, and environments running untrusted local workloads.
Executive priority
Handle as a planned but important confidentiality remediation. It is medium severity, local, and complex, but the impact can matter on shared infrastructure. Prioritize externally hosted, multi-user, and virtualized environments before single-user endpoints with low data sensitivity.
Technical view
This is Microarchitectural Store Buffer Data Sampling, a speculative-execution information disclosure flaw mapped to CWE-200. The CVSS 3.1 score is 5.6: local attack vector, high complexity, low privileges, scope changed, and high confidentiality impact. Vendor references point to Intel microcode and operating-system updates.
Likely exposure
Exposure depends on whether systems use impacted Intel processors and whether vendor microcode and OS mitigations were applied. Multi-tenant servers, hypervisors, and appliances based on affected Intel CPUs deserve priority review. The provided bundle references Intel’s impacted-product guidance but does not embed the full product list.
Exploitation context
The source bundle does not show CISA KEV listing or other cited evidence of active exploitation. Exploitation requires local authenticated access and is described as high complexity. Treat it as a confidentiality risk in shared-compute settings rather than a broad remote compromise issue.
Researcher notes
Do not assume all Intel CPUs are affected from the bundle alone; use Intel’s product list. The strongest evidence provided is the CVE record, Intel SA-00233, and multiple vendor advisories. No exploit-in-the-wild signal is supplied, and KEV is false.
Mitigation direction
- Review Intel SA-00233 for affected processors and current microcode guidance.
- Apply relevant OS, hypervisor, firmware, and appliance vendor security updates.
- Prioritize shared virtualization hosts and systems running untrusted local workloads.
- Check vendor advisories for Synology, Linux distributions, FreeBSD, and appliance vendors in scope.
- Follow vendor guidance where patch or mitigation specifics vary by platform.
Validation and detection
- Inventory Intel CPU models and map them against Intel’s affected-product guidance.
- Confirm deployed microcode versions include vendor fixes for CVE-2018-12126.
- Verify operating systems and hypervisors received related 2019 security updates.
- Review virtualization platforms for vendor-specific MDS mitigation status.
- Document exceptions where hardware or vendor support is unavailable.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2018-12126 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N1.14CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.6MediumVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00233.htmlCVE reference, intel · x_refsource_CONFIRM
- https://www.synology.com/security/advisory/Synology_SA_19_24CVE reference, intel · x_refsource_CONFIRM
- FEDORA-2019-1f5832fc0eCVE reference, intel · vendor-advisory, x_refsource_FEDORA
- RHSA-2019:1455CVE reference, intel · vendor-advisory, x_refsource_REDHAT
- USN-3977-3CVE reference, intel · vendor-advisory, x_refsource_UBUNTU
- [debian-lts-announce] 20190620 [SECURITY] [DLA 1789-2] intel-microcode security updateCVE reference, intel · mailing-list, x_refsource_MLIST
- 20190624 [SECURITY] [DSA 4447-2] intel-microcode security updateCVE reference, intel · mailing-list, x_refsource_BUGTRAQ
- 20190624 [SECURITY] [DSA 4469-1] libvirt security updateCVE reference, intel · mailing-list, x_refsource_BUGTRAQ
- https://cert-portal.siemens.com/productcert/pdf/ssa-616472.pdfCVE reference, intel · x_refsource_CONFIRM
- FreeBSD-SA-19:07CVE reference, intel · vendor-advisory, x_refsource_FREEBSD
- RHSA-2019:2553CVE reference, intel · vendor-advisory, x_refsource_REDHAT
- https://kc.mcafee.com/corporate/index?page=content&id=SB10292CVE reference, intel · x_refsource_CONFIRM
- https://cert-portal.siemens.com/productcert/pdf/ssa-608355.pdfCVE reference, intel · x_refsource_CONFIRM
- FreeBSD-SA-19:26CVE reference, intel · vendor-advisory, x_refsource_FREEBSD
- 20191112 FreeBSD Security Advisory FreeBSD-SA-19:26.mcuCVE reference, intel · mailing-list, x_refsource_BUGTRAQ
- 20191112 [SECURITY] [DSA 4564-1] linux security updateCVE reference, intel · mailing-list, x_refsource_BUGTRAQ
- DSA-4602CVE reference, intel · vendor-advisory, x_refsource_DEBIAN
- 20200114 [SECURITY] [DSA 4602-1] xen security updateCVE reference, intel · mailing-list, x_refsource_BUGTRAQ
- GLSA-202003-56CVE reference, intel · vendor-advisory, x_refsource_GENTOO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.