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MEDIUM

CVE-2018-3639

CVSS v3

5.5

MEDIUM

EPSS Score

60.6 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2018-3639 Red Hat Product Security5,137 products fixed · 11 known affected

    hw: cpu: speculative store bypass

    qemu-img-ma as a component of Red Hat Enterprise Linux 7 · qemu-kvm-common-ma as a component of Red Hat Enterprise Linux 7 · qemu-kvm-ma as a component of Red Hat Enterprise Linux 7

  • RHSA-2019:1046 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: rhvm-setup-plugins security and bug fix update

  • RHSA-2019:0148 Red Hat Product Security6 products fixed

    Red Hat Security Advisory: qemu-kvm-rhev security update

  • RHSA-2018:3424 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: qemu-kvm security update

  • RHSA-2018:3425 Red Hat Product Security12 products fixed

    Red Hat Security Advisory: qemu-kvm security update

  • RHSA-2018:3423 Red Hat Product Security42 products fixed

    Red Hat Security Advisory: qemu-kvm security update

87 more advisories

Full record on NVD

Description

Systems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB), Variant 4.

Technical details

Published
2018-05-22
Exploit-DB
EDB-44695

Frequently asked questions

What is CVE-2018-3639?

Systems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB), Variant 4.

Is CVE-2018-3639 actively exploited?

Active exploitation of CVE-2018-3639 has not been confirmed. Its EPSS score was 60.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-3639?

CVE-2018-3639 has a CVSS v3 base score of 5.5 (MEDIUM severity).

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