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Fencer Vulns
high 8.8

CVE-2023-23583 json

Sequence of processor instructions leads to unexpected behavior for some Intel(R) Processors may allow an authenticated user to potentially…

published 2023-11-14 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-27683

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Sequence of processor instructions leads to unexpected behavior for some Intel(R) Processors may allow an authenticated user to potentially enable escalation of privilege and/or information disclosure and/or denial of service via local access.

Patch / fix

  • intel-microcode Debian 12 3.20231114.1~deb12u1
  • intel-microcode Debian 14, Debian 13 3.20231114.1

debian advisories DEBIAN-CVE-2023-23583

  • intel-microcode Ubuntu 20.04 LTS 3.20231114.0ubuntu0.20.04.1
  • intel-microcode Ubuntu 22.04 LTS 3.20231114.0ubuntu0.22.04.1
  • intel-microcode Ubuntu Pro 16.04 LTS 3.20231114.0ubuntu0.16.04.1+esm1
  • intel-microcode Ubuntu Pro 18.04 LTS 3.20231114.0ubuntu0.18.04.1+esm1

ubuntu advisories UBUNTU-CVE-2023-23583

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 for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +16 more 20231114-150200.35.1
  • ucode-intel SLES for SAP 12 SP5, SLES 12 SP5 20231114-131.1
  • ucode-intel SLES for SAP 12 SP5, SLES 12 SP5 20231113-128.1
  • ucode-intel SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +18 more 20231113-150200.32.1
  • microcode_ctl SLES 11 SP4 LTSS EXTREME CORE 1.17-102.83.81.1
  • ucode-intel SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 20231114-150100.3.231.1
  • ucode-intel SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 20231113-150100.3.228.1

suse advisories SUSE-SU-2025:1032-1SUSE-SU-2023:4510-1SUSE-SU-2023:4500-1SUSE-SU-2023:4493-1SUSE-SU-2023:4442-1SUSE-SU-2023:4441-1

  • spectre-meltdown-checker openSUSE Tumbleweed 26.36.0602723-1.1
  • ucode-intel openSUSE Tumbleweed 20231114-1.1

opensuse advisories openSUSE-SU-2026:11242-1openSUSE-SU-2024:13434-1

  • intel-ucode Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 20231114-r0

alpine advisories ALPINE-CVE-2023-23583

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2023-23583 updated cvss 8.8

hw: Intel: execution of MOVSB instructions with redundant REX prefix leads to unintended system behavior

  • Red Hat Enterprise Linux 6 microcode_ctl Red Hat Enterprise Linux 7 microcode_ctl Red Hat Enterprise Linux 8 microcode_ctl Red Hat Enterprise Linux 9 microcode_ctl
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

1.28% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a Intel(R) Processors

Classification

Weakness
  • CWE-1281 Sequence of Processor Instructions Leads to Unexpected Behavior
  • CWE-276 Incorrect Default Permissions

References

Sources

Fencer Vulns 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.