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Fencer Vulns
medium 5.5

CVE-2023-38575 json

Non-transparent sharing of return predictor targets between contexts in some Intel(R) Processors may allow an authorized user to potentiall…

published 2024-03-14 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-42374

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits
0
none known

Summary

Non-transparent sharing of return predictor targets between contexts in some Intel(R) Processors may allow an authorized user to potentially enable information disclosure via local access.

Patch / fix

  • intel-microcode Debian 12 3.20240312.1~deb12u1
  • intel-microcode Debian 14, Debian 13 3.20240312.1

debian advisories DEBIAN-CVE-2023-38575

  • intel-microcode Ubuntu 20.04 LTS 3.20240514.0ubuntu0.20.04.1
  • intel-microcode Ubuntu 22.04 LTS 3.20240514.0ubuntu0.22.04.1
  • intel-microcode Ubuntu Pro 16.04 LTS 3.20240514.0ubuntu0.16.04.1+esm1
  • intel-microcode Ubuntu Pro 18.04 LTS 3.20240514.0ubuntu0.18.04.1+esm1

ubuntu advisories UBUNTU-CVE-2023-38575

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

  • microcode_ctl RHEL 9 4:20230808-2.20240531.1.el9_4
  • microcode_ctl RHEL 9 4:20240910-1.el9_5

red hat advisories RHEA-2024:7620RHSA-2024:9401

  • ucode-intel Linux Micro 6.0 20240813-1.1
  • ucode-intel SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +19 more 20240312-150200.38.1
  • ucode-intel SLES for SAP 12 SP5, SLES 12 SP5 20240312-134.1
  • microcode_ctl SLES 11 SP4 LTSS EXTREME CORE 1.17-102.83.81.1

suse advisories SUSE-SU-2025:1032-1SUSE-SU-2025:20020-1SUSE-SU-2024:1139-1SUSE-SU-2024:0917-1

  • ucode-intel openSUSE Tumbleweed 20240312-1.1

opensuse advisories openSUSE-SU-2024:13769-1

  • microcode_ctl AlmaLinux 9 4:20240910-1.el9_5

almalinux advisories ALSA-2024:9401

  • microcode_ctl Rocky Linux 9 4:20240910-1.el9_5

rocky linux advisories RLSA-2024:9401

  • intel-ucode Alpine 3.18, Alpine 3.17 20240813-r0
  • intel-ucode Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 20240312-r0

alpine advisories ALPINE-CVE-2023-38575

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-2023-38575 updated cvss 5.5

kernel: Local information disclosure in some Intel(R) processors

  • Red Hat Enterprise Linux 6 microcode_ctl
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 microcode_ctl Red Hat Enterprise Linux 8 microcode_ctl
    affected: no fix available
  • Red Hat Enterprise Linux BaseOS (v. 9) microcode_ctl 20240910-1.el9_5, microcode_ctl 20230808-2.20240531.1.el9_4
    fixed: vendor fix RHEA-2024:7620
  • Red Hat Enterprise Linux 6 perf, kernel, kernel-rt, python-perf, kernel-kdump, kernel-firmware, +2 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    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
partial
Assessed
2 y ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

  • n/a Intel(R) Processors

Classification

Weakness
  • CWE-1303 Non-Transparent Sharing of Microarchitectural Resources

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.