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Fencer Vulns
medium 4.9

CVE-2023-31347 json

Due to a code bug in Secure_TSC, SEV firmware may allow an attacker with high privileges to cause a guest to observe an incorrect TSC when…

published 2024-02-13 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-35658

cvss
4.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

Due to a code bug in Secure_TSC, SEV firmware may allow an attacker with high privileges to cause a guest to observe an incorrect TSC when Secure TSC is enabled potentially resulting in a loss of guest integrity.

Patch / fix

  • amd epyc_7773x_firmware milanpi_1.0.0.c
  • amd epyc_7763_firmware milanpi_1.0.0.c
  • amd epyc_7713_firmware milanpi_1.0.0.c
  • amd epyc_7663_firmware milanpi_1.0.0.c
  • amd epyc_7663p_firmware milanpi_1.0.0.c
  • amd epyc_7643_firmware milanpi_1.0.0.c
  • amd epyc_7643p_firmware milanpi_1.0.0.c
  • amd epyc_7573x_firmware milanpi_1.0.0.c
  • amd epyc_75f3_firmware milanpi_1.0.0.c
  • amd epyc_7543_firmware milanpi_1.0.0.c
  • amd epyc_7543p_firmware milanpi_1.0.0.c
  • amd epyc_7513_firmware milanpi_1.0.0.c
  • amd epyc_7453_firmware milanpi_1.0.0.c
  • amd epyc_7473x_firmware milanpi_1.0.0.c
  • amd epyc_74f3_firmware milanpi_1.0.0.c
  • amd epyc_7443_firmware milanpi_1.0.0.c
  • amd epyc_7443p_firmware milanpi_1.0.0.c
  • amd epyc_7413_firmware milanpi_1.0.0.c
  • amd epyc_7373x_firmware milanpi_1.0.0.c
  • amd epyc_73f3_firmware milanpi_1.0.0.c

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-2023-31347 updated cvss 2.3

kernel: Insufficient check may lead to an incorrect TSC

  • 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, python-perf, kernel-kdump, kernel-tools, +3 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-core, kernel-tools, python3-perf, +17 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 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

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
NVD 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
CNA 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Affected products

  • AMD 3rd Gen AMD EPYC™ Processors
  • AMD 4th Gen AMD EPYC™ Processors

Classification

Weakness

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.