CVE-2018-12126

Microarchitectural Store Buffer Data Sampling (MSBDS): Store buffers 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

Published: 2019-05-30 Last update: 2026-05-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-12126 is rated Moderate Risk (45.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.52%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-12126

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-30 0.59% 0.52% -0.07%
2 2026-05-09 0.49% 0.59% +0.10%
3 2026-03-17 — 0.49% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-12126

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.6 3.1 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.1 4.0 134c704f-9b21-4f2e-91b3-4a467353bcc0
5.6 3.0 MEDIUM
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.1 4.0 [email protected]
4.7 2.0 MEDIUM
AV:L/AC:M/Au:N/C:C/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.4 6.9 [email protected]

Weakness enumeration for CVE-2018-12126

OS Trackers for CVE-2018-12126

vendor priority summary link
alpine medium CVE-2018-12126: 2 source package rows (intel-ucode, xen); 31 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 31, open 0. https://security.alpinelinux.org/vuln/CVE-2018-12126
debian not yet assigned CVE-2018-12126 not yet assigned priority: Debian including 3 source packages (intel-microcode, linux, xen), 15 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 15. https://security-tracker.debian.org/tracker/CVE-2018-12126
gentoo high CVE-2018-12126: 1 GLSA(s) (202003-56), 2 atom(s) (app-emulation/xen, app-emulation/xen-tools); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-12126
redhat medium — https://access.redhat.com/security/cve/CVE-2018-12126
suse medium CVE-2018-12126 severity moderate: SUSE including 2085 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 3294 product×package rows across 108 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 3.0, … (108 product lines)): Fixed 2936, Known Not Affected 201, Known Affected 157. https://www.suse.com/security/cve/CVE-2018-12126/
ubuntu high CVE-2018-12126 high priority: Ubuntu including 145 source packages (intel-microcode, libvirt, …), 1826 status rows across 17 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, trusty, upstream, xenial): DNE 1342, not-affected 248, released 205, ignored 27, needs-triage 4. https://ubuntu.com/security/CVE-2018-12126

Affected software / configurations for CVE-2018-12126

Vendor Product Version Raw CPE
intel microarchitectural_store_buffer_data_sampling_firmware — cpe:2.3:o:intel:microarchitectural_store_buffer_data_sampling_firmware:-:*:*:*:*:*:*:*
fedoraproject fedora 29 cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*

References for CVE-2018-12126

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00014.html
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00052.html
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00053.html
http://packetstormsecurity.com/files/155281/FreeBSD-Security-Advisory-FreeBSD-SA-19-26.mcu.html
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2019-003.txt
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190712-01-mds-en
https://access.redhat.com/errata/RHSA-2019:1455
https://access.redhat.com/errata/RHSA-2019:2553
https://cert-portal.siemens.com/productcert/pdf/ssa-608355.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-616472.pdf
https://kc.mcafee.com/corporate/index?page=content&id=SB10292
https://lists.debian.org/debian-lts-announce/2019/06/msg00018.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH73SGTJ575OBCPSJFX6LX7KP2KZIEN4/
https://seclists.org/bugtraq/2019/Jun/28
https://seclists.org/bugtraq/2019/Jun/36
https://seclists.org/bugtraq/2019/Nov/15
https://seclists.org/bugtraq/2019/Nov/16
https://seclists.org/bugtraq/2020/Jan/21
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:26.mcu.asc
https://security.gentoo.org/glsa/202003-56
https://usn.ubuntu.com/3977-3/
https://www.debian.org/security/2020/dsa-4602
https://www.freebsd.org/security/advisories/FreeBSD-SA-19:07.mds.asc
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00233.html Vendor Advisory
https://www.synology.com/security/advisory/Synology_SA_19_24
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