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CVE-2021-26347

TOCTOU (time-of-check to time-of-use) issue in the System Management Unit (SMU) may result in a...

4.7 Medium

Failure to validate the integer operand in ASP (AMD Secure Processor) bootloader may allow an attacker to introduce an integer overflow in the L2 directory table in SPI flash resulting in a potential denial of service.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.20%Down 0.7 points since May 12, 2022
90%50%10%1%

What each source reports

NVD Score used 4.7

Failure to validate the integer operand in ASP (AMD Secure Processor) bootloader may allow an attacker to introduce an integer overflow in the L2 directory table in SPI flash resulting in a potential denial of service.

Record
CVE-2021-26347
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
4.7 MediumAV:L/AC:M/Au:N/C:N/I:N/A:C
Weakness
CWE-1284
Updated
2026-11-02
CVE List No score

Failure to validate the integer operand in ASP (AMD Secure Processor) bootloader may allow an attacker to introduce an integer overflow in the L2 directory table in SPI flash resulting in a potential denial of service.

Record
CVE-2021-26347
Updated
2026-11-02
EUVDEUVD-2021-13153 No score

Failure to validate the integer operand in ASP (AMD Secure Processor) bootloader may allow an attacker to introduce an integer overflow in the L2 directory table in SPI flash resulting in a potential denial of service.

Record
EUVD-2021-13153
Updated
2026-11-03
GitHub AdvisoriesGHSA-3mg2-q757-f3m2 4.7

TOCTOU (time-of-check to time-of-use) issue in the System Management Unit (SMU) may result in a...

TOCTOU (time-of-check to time-of-use) issue in the System Management Unit (SMU) may result in a DMA (Direct Memory Access) to invalid DRAM address that could result in denial of service.

Record
GHSA-3mg2-q757-f3m2
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-367
Updated
2026-11-02
OSVSUSE-SU-2022:1751-1 No score

Security update for kernel-firmware

This update for kernel-firmware fixes the following issues:

Update AMD ucode and SEV firmware

  • CVE-2021-26339, CVE-2021-26373, CVE-2021-26347, CVE-2021-26376, CVE-2021-26375, CVE-2021-26378, CVE-2021-26372, CVE-2021-26339, CVE-2021-26348, CVE-2021-26342, CVE-2021-26388, CVE-2021-26349, CVE-2021-26364, CVE-2021-26312, CVE-2021-26350, CVE-2021-46744, bsc#1199459, bsc#1199470)

Update Intel Bluetooth firmware (INTEL-SA-00604, bsc#1195786):

  • CVE-2021-33139, CVE-2021-33155: Improper conditions check in the firmware for some Intel Wireless Bluetooth and Killer Bluetooth products may allow an authenticated user to potentially cause denial of service via adjacent access.
Record
SUSE-SU-2022:1751-1
Updated
2026-11-02
OSVSUSE-SU-2022:1840-1 No score

Security update for kernel-firmware

This update for kernel-firmware fixes the following issues:

Update AMD ucode and SEV firmware

  • (CVE-2021-26339, CVE-2021-26373, CVE-2021-26347, CVE-2021-26376, CVE-2021-26375, CVE-2021-26378, CVE-2021-26372, CVE-2021-26339, CVE-2021-26348, CVE-2021-26342, CVE-2021-26388, CVE-2021-26349, CVE-2021-26364, CVE-2021-26312, CVE-2021-26350, CVE-2021-46744, bsc#1199459, bsc#1199470)
Record
SUSE-SU-2022:1840-1
Updated
2026-11-02
OSVSUSE-SU-2022:1846-1 No score

Security update for kernel-firmware

This update for kernel-firmware fixes the following issues:

Update AMD ucode and SEV firmware

  • (CVE-2021-26339, CVE-2021-26373, CVE-2021-26347, CVE-2021-26376, CVE-2021-26375, CVE-2021-26378, CVE-2021-26372, CVE-2021-26339, CVE-2021-26348, CVE-2021-26342, CVE-2021-26388, CVE-2021-26349, CVE-2021-26364, CVE-2021-26312, CVE-2021-26350, CVE-2021-46744, bsc#1199459, bsc#1199470)
Record
SUSE-SU-2022:1846-1
Updated
2026-11-02
OSVSUSE-SU-2022:1847-1 No score

Security update for kernel-firmware

This update for kernel-firmware fixes the following issues:

Update AMD ucode and SEV firmware

  • (CVE-2021-26339, CVE-2021-26373, CVE-2021-26347, CVE-2021-26376, CVE-2021-26375, CVE-2021-26378, CVE-2021-26372, CVE-2021-26339, CVE-2021-26348, CVE-2021-26342, CVE-2021-26388, CVE-2021-26349, CVE-2021-26364, CVE-2021-26312, CVE-2021-26350, CVE-2021-46744, bsc#1199459, bsc#1199470)
Record
SUSE-SU-2022:1847-1
Updated
2026-11-02
OSVSUSE-SU-2022:1923-1 No score

Security update for kernel-firmware

This update for kernel-firmware fixes the following issues:

Update to version 20220411 (git commit f219d616f42b, bsc#1199459):

  • CVE-2021-26373, CVE-2021-26347, CVE-2021-26376, CVE-2021-26350, CVE-2021-26375, CVE-2021-26378, CVE-2021-26372, CVE-2021-26339, CVE-2021-26348, CVE-2021-26342, CVE-2021-26388, CVE-2021-26349, CVE-2021-26364, CVE-2021-26312: Update AMD cpu microcode

Update to version 20220309 (git commit cd01f857da28, bsc#1199470):

  • CVE-2021-46744: Ciphertext Side Channels on AMD SEV

Update Intel Bluetooth firmware (INTEL-SA-00604, bsc#1195786):

  • CVE-2021-33139, CVE-2021-33155: Improper conditions check in the firmware for some Intel Wireless Bluetooth and Killer Bluetooth products may allow an authenticated user to potentially cause denial of service via adjacent access.
Record
SUSE-SU-2022:1923-1
Updated
2026-11-02

Affected products

Show 38 moreShow less

Affected packages

Affected packages
PackageAffectedFixed
kernel-firmware
SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise High Performance Computing 15 SP2-ESPOS
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise Server 15 SP1-BCL
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise Server 15 SP1-LTSS
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise Server 15 SP2-BCL
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise Server 15 SP2-LTSS
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise Server for SAP Applications 15 SP1
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise Server for SAP Applications 15 SP2
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
Show 21 moreShow less
Affected packages
PackageAffectedFixed
kernel-firmware
SUSE:Manager Proxy 4.1
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Manager Retail Branch Server 4.1
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Manager Server 4.1
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Enterprise Storage 6
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Enterprise Storage 7
From an advisory covering 18 CVEs
 before 20200107-150100.3.31.1
20200107-150100.3.31.1
kernel-firmware
SUSE:Linux Enterprise Module for Basesystem 15 SP3
From an advisory covering 15 CVEs
 before 20210208-150300.4.10.1
20210208-150300.4.10.1
kernel-firmware
SUSE:Linux Enterprise Micro 5.1
From an advisory covering 15 CVEs
 before 20210208-150300.4.10.1
20210208-150300.4.10.1
kernel-firmware
SUSE:Linux Enterprise Micro 5.2
From an advisory covering 15 CVEs
 before 20210208-150300.4.10.1
20210208-150300.4.10.1
kernel-firmware
openSUSE:Leap 15.3
From an advisory covering 15 CVEs
 before 20210208-150300.4.10.1
20210208-150300.4.10.1
kernel-firmware
SUSE:OpenStack Cloud 9
From an advisory covering 15 CVEs
 before 20190618-5.25.2
20190618-5.25.2
kernel-firmware
SUSE:OpenStack Cloud Crowbar 9
From an advisory covering 15 CVEs
 before 20190618-5.25.2
20190618-5.25.2
kernel-firmware
SUSE:Linux Enterprise Server for SAP Applications 12 SP4
From an advisory covering 15 CVEs
 before 20190618-5.25.2
20190618-5.25.2
kernel-firmware
SUSE:Linux Enterprise Server 12 SP4-LTSS
From an advisory covering 15 CVEs
 before 20190618-5.25.2
20190618-5.25.2
kernel-firmware
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 15 CVEs
 before 20190618-5.25.2
20190618-5.25.2
kernel-firmware
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 15 CVEs
 before 20190618-5.25.2
20190618-5.25.2
kernel-firmware
SUSE:Linux Enterprise High Performance Computing 15-ESPOS
From an advisory covering 15 CVEs
 before 20191118-150000.3.42.1
20191118-150000.3.42.1
kernel-firmware
SUSE:Linux Enterprise High Performance Computing 15-LTSS
From an advisory covering 15 CVEs
 before 20191118-150000.3.42.1
20191118-150000.3.42.1
kernel-firmware
SUSE:Linux Enterprise Server 15-LTSS
From an advisory covering 15 CVEs
 before 20191118-150000.3.42.1
20191118-150000.3.42.1
kernel-firmware
SUSE:Linux Enterprise Server for SAP Applications 15
From an advisory covering 15 CVEs
 before 20191118-150000.3.42.1
20191118-150000.3.42.1
kernel-firmware
SUSE:Linux Enterprise Module for Basesystem 15 SP4
From an advisory covering 17 CVEs
 before 20220509-150400.4.5.1
20220509-150400.4.5.1
kernel-firmware
openSUSE:Leap 15.4
From an advisory covering 17 CVEs
 before 20220509-150400.4.5.1
20220509-150400.4.5.1

History

History
RecordedChangedSources
affected, facts
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-26347 is a medium vulnerability (CVSS 4.7) in Amd Epyc 7002 Firmware, published May 11, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 9th percentile. No source names a fixed version.

References

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