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Fencer Vulns
medium 5.9

CVE-2025-61971 json

Missing lock bit protection for NBIO registers could allow a local admin-privileged attacker to modify MMIO routing configurations, potenti…

published 2026-05-13 5 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-209811

cvss
5.9
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

Missing lock bit protection for NBIO registers could allow a local admin-privileged attacker to modify MMIO routing configurations, potentially resulting in loss of SEV-SNP guest integrity.

Patch / fix

  • AMD AMD EPYC™ 9004 Series Processors GenoaPI_1.0.0.H
  • AMD AMD EPYC™ 7003 Series Processors MilanPI-SP3_1.0.0.J
  • AMD AMD EPYC™ 9005 Series Processors TurinPI_1.0.0.8
  • AMD AMD EPYC™ 8004 Series Processors GenoaPI_1.0.0.H
  • AMD AMD EPYC™ Embedded 7003 Series Processors EmbMilanPI-SP3 1.0.0.D
  • AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa") EmbGenoaPI-SP5 1.0.0.D
  • AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo") EmbGenoaPI-SP5 1.0.0.D
  • AMD AMD EPYC™ Embedded 8004 Series Processors EmbGenoaPI-SP5 1.0.0.D
  • AMD AMD EPYC™ Embedded 9005 Series Processors EmbeddedTurinPI_SP5_1004

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-2025-61971 updated cvss 6.0

microcode_ctl: Microcode: Loss of SEV-SNP guest integrity via NBIO register modification

  • Red Hat Enterprise Linux 8 microcode_ctl Red Hat Enterprise Linux 9 microcode_ctl
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 10 microcode_ctl
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”

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
5 mo ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
CNA 4.0 5.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • AMD AMD EPYC™ 9004 Series Processors
  • AMD AMD EPYC™ 7003 Series Processors
  • AMD AMD EPYC™ 9005 Series Processors
  • AMD AMD EPYC™ 8004 Series Processors
  • AMD AMD EPYC™ Embedded 7003 Series Processors
  • AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa")
  • AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo")
  • AMD AMD EPYC™ Embedded 8004 Series Processors
  • AMD AMD EPYC™ Embedded 9005 Series Processors

Classification

Weakness
  • CWE-1233 Security-Sensitive Hardware Controls with Missing Lock Bit Protection

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.