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Fencer Vulns
high 7.8

CVE-2021-26316 json

Failure to validate the communication buffer and communication service in the BIOS may allow an attacker to tamper with the buffer resultin…

published 2023-01-10 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13122

cvss
7.8
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 18%
public exploits
0
none known

Summary

Failure to validate the communication buffer and communication service in the BIOS may allow an attacker to tamper with the buffer resulting in potential SMM (System Management Mode) arbitrary code execution.

Patch / fix

  • amd epyc_7h12_firmware romepi_1.0.0.d
  • amd epyc_7f72_firmware romepi_1.0.0.d
  • amd epyc_7f52_firmware romepi_1.0.0.d
  • amd epyc_7f32_firmware romepi_1.0.0.d
  • amd epyc_7742_firmware romepi_1.0.0.d
  • amd epyc_7702p_firmware romepi_1.0.0.d
  • amd epyc_7702_firmware romepi_1.0.0.d
  • amd epyc_7662_firmware romepi_1.0.0.d
  • amd epyc_7642_firmware romepi_1.0.0.d
  • amd epyc_7552_firmware romepi_1.0.0.d
  • amd epyc_7542_firmware romepi_1.0.0.d
  • amd epyc_7532_firmware romepi_1.0.0.d
  • amd epyc_7502p_firmware romepi_1.0.0.d
  • amd epyc_7502_firmware romepi_1.0.0.d
  • amd epyc_7452_firmware romepi_1.0.0.d
  • amd epyc_7402_firmware romepi_1.0.0.d
  • amd epyc_7402p_firmware romepi_1.0.0.d
  • amd epyc_7352_firmware romepi_1.0.0.d
  • amd epyc_7302p_firmware romepi_1.0.0.d
  • amd epyc_7302_firmware romepi_1.0.0.d

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-2021-26316 updated cvss 7.8

hw: amd: arbitrary code execution in bios due to a fault in communication buffer

  • 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 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
total
Assessed
19 mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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
CNA 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

  • AMD Ryzen 5000 Series
  • AMD Ryzen 2000 Series
  • AMD Ryzen 3000 Series
  • AMD 1st Gen EPYC
  • AMD 2nd Gen EPYC
  • AMD 3rd Gen EPYC

Classification

Weakness
  • CWE-20 Improper Input Validation

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.