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NVD / CVE Program· CNA AMD

CVE-2021-26376: Insufficient checks in System Management Unit (SMU) FeatureConfig may result in reenabling features potentially resulting in denial of…

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: kernel-firmware (openSUSE:Leap 15.3) 20210208-150300.4.10.1; kernel-firmware (openSUSE:Leap 15.4) 20220509-150400.4.5.1; kernel-firmware (SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS) 20200107-150100.3.31.1.

Low priority for now. Upgrade to kernel-firmware (openSUSE:Leap 15.3) 20210208-150300.4.10.1; kernel-firmware (openSUSE:Leap 15.4) 20220509-150400.4.5.1; kernel-firmware (SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS) 20200107-150100.3.31.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Insufficient checks in System Management Unit (SMU) FeatureConfig may result in reenabling features potentially resulting in denial of resources and/or denial of service.

Published
May 11, 2022
Updated
Jun 16, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-26376

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
amdepyc 7232p firmware
amdepyc 7232p
amdepyc 7302p firmware
amdepyc 7302p
amdepyc 7402p firmware
amdepyc 7402p
amdepyc 7502p firmware
amdepyc 7502p
amdepyc 7702p firmware
amdepyc 7702p
amdepyc 7252 firmware
amdepyc 7252

and 155 more

Versions reported by the vendor

Affected version ranges reported by the assigning authority (AMD). Independent of NVD's CPE analysis and usually ahead of it.

  • AMD Athlon™ Series

    • variousaffected

  • AMD EPYC™ Processors

    • variousaffected

  • AMD Ryzen™ Series

    • variousaffected
Affected versions · NVD (20)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • amd epyc 7232p firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7252 firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7262 firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7272 firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7282 firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 72f3 firmwarebefore milanpi-sp3_1.0.0.7
  • amd epyc 7302 firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7302p firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7313p firmwarebefore milanpi-sp3_1.0.0.7
  • amd epyc 7343 firmwarebefore milanpi-sp3_1.0.0.7
  • amd epyc 7352 firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7373x firmwarebefore milanpi-sp3_1.0.0.7
  • amd epyc 73f3 firmwarebefore milanpi-sp3_1.0.0.7
  • amd epyc 7402 firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7402p firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7413 firmwarebefore milanpi-sp3_1.0.0.7
  • amd epyc 7443p firmwarebefore milanpi-sp3_1.0.0.7
  • amd epyc 7452 firmwarebefore romepi-sp3_1.0.0.d
  • amd epyc 7453 firmwarebefore milanpi-sp3_1.0.0.7
  • amd epyc 7473x firmwarebefore milanpi-sp3_1.0.0.7

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
openSUSE:Leap 15.3kernel-firmwarebefore 20210208-150300.4.10.120210208-150300.4.10.1
openSUSE:Leap 15.4kernel-firmwarebefore 20220509-150400.4.5.120220509-150400.4.5.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOSkernel-firmwarebefore 20200107-150100.3.31.120200107-150100.3.31.1
SUSE:Linux Enterprise High Performance Computing 15-ESPOSkernel-firmwarebefore 20191118-150000.3.42.120191118-150000.3.42.1
SUSE:Linux Enterprise Module for Basesystem 15 SP3kernel-firmwarebefore 20210208-150300.4.10.120210208-150300.4.10.1
SUSE:Linux Enterprise Module for Basesystem 15 SP4kernel-firmwarebefore 20220509-150400.4.5.120220509-150400.4.5.1
SUSE:OpenStack Cloud 9kernel-firmwarebefore 20190618-5.25.220190618-5.25.2

Same product

amd: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-26323Failure to validate SEV Commands while SNP is active may result in a potential impact to memory integrity.
    31Monitor
  • CVE-2021-26326Failure to validate VM_HSAVE_PA during SNP_INIT may result in a loss of memory integrity.
    31Monitor
  • CVE-2023-20533Insufficient DRAM address validation in System Management Unit (SMU) may allow an attacker to read/write from/to an invalid DRAM address…
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-26373May 11, 2022 · Insufficient bound checks in the System Management Unit (SMU) may result in a system voltage malfunction that could result in denial of…
    22Monitor
  • ← EarlierCVE-2021-26375May 11, 2022 · Insufficient General Purpose IO (GPIO) bounds check in System Management Unit (SMU) may result in access/updates from/to invalid address…
    22Monitor
  • Later →CVE-2021-26378May 11, 2022 · Insufficient bound checks in the System Management Unit (SMU) may result in access to an invalid address space that could result in denial…
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:kernel-firmware20210208-150300.4.10.1 · openSUSE:Leap 15.3Package registry (OSV)
suse:kernel-firmware20200107-150100.3.31.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOSPackage registry (OSV)
suse:kernel-firmware20210208-150300.4.10.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records