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Fencer Intel
medium 5.6

CVE-2018-3640 json

Systems with microprocessors utilizing speculative execution and that perform speculative reads of system registers may allow unauthorized…

published 2018-05-22 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-15494

cvss
5.6
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.1%
EPSS 7.1% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

Systems with microprocessors utilizing speculative execution and that perform speculative reads of system registers may allow unauthorized disclosure of system parameters to an attacker with local user access via a side-channel analysis, aka Rogue System Register Read (RSRE), Variant 3a.

Patch / fix

  • intel-microcode Debian 14, Debian 13, Debian 12 3.20180703.1

debian advisories DEBIAN-CVE-2018-3640

  • intel-microcode Ubuntu 14.04 LTS 3.20180807a.0ubuntu0.14.04.1
  • intel-microcode Ubuntu 16.04 LTS 3.20180807a.0ubuntu0.16.04.1
  • intel-microcode Ubuntu 18.04 LTS 3.20180807a.0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-3640

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ucode-intel SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +8 more 20180807-13.29.1
  • ucode-intel SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +8 more 20180703-13.25.1
  • ucode-intel SLE Module for Basesystem 15 20180807-3.6.1
  • microcode_ctl SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 1.17-102.83.27.1
  • microcode_ctl SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 1.17-102.83.24.1
  • ucode-intel SLE Module for Basesystem 15 20180703-3.3.1

suse advisories SUSE-SU-2018:2331-2SUSE-SU-2018:1935-2SUSE-SU-2018:2338-1SUSE-SU-2018:2335-1SUSE-SU-2018:2331-1SUSE-SU-2018:2076-1

  • spectre-meltdown-checker openSUSE Tumbleweed 26.36.0602723-1.1
  • ucode-intel openSUSE Tumbleweed 20210608-1.2

opensuse advisories openSUSE-SU-2026:11242-1openSUSE-SU-2024:11478-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-3640 updated cvss 2.8

hw: cpu: speculative register load

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

7.14% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 5.6 CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
NVD 2.0 4.7 AV:L/AC:M/Au:N/C:C/I:N/A:N

Affected products

  • Intel Corporation Multiple

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.