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CVE-2021-26401· NVD / CVE Program· CNA AMD

LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.

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: 0.29% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: bpftool (AlmaLinux:8) 4.18.0-372.9.1.el8; kernel (AlmaLinux:8) 4.18.0-372.9.1.el8; kernel-abi-stablelists (AlmaLinux:8) 4.18.0-372.9.1.el8.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to bpftool (AlmaLinux:8) 4.18.0-372.9.1.el8; kernel (AlmaLinux:8) 4.18.0-372.9.1.el8; kernel-abi-stablelists (AlmaLinux:8) 4.18.0-372.9.1.el8 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

MediumCVSS 5.6 · v3.1—No exploit Fix available
Published
Mar 11, 2022
Updated
Jun 16, 2026
EPSS
0.2% · 20th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.6 / 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-2021-26401

When you'll hear from us

  • when it enters CISA KEV
  • 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
amdathlon x4 940 firmware
amdathlon x4 940
amdathlon x4 950 firmware
amdathlon x4 950
amdathlon x4 970 firmware
amdathlon x4 970
amdathlon x4 835 firmware
amdathlon x4 835
amdathlon x4 845 firmware
amdathlon x4 845
amdathlon x4 830 firmware
amdathlon x4 830

and 188 more

Affected versions

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

  • amd a10-9600p firmwareall versions
  • amd a10-9630p firmwareall versions
  • amd a12-9700p firmwareall versions
  • amd a12-9730p firmwareall versions
  • amd a4-9120 firmwareall versions
  • amd a6-9210 firmwareall versions
  • amd a6-9220 firmwareall versions
  • amd a6-9220c firmwareall versions
  • amd a9-9410 firmwareall versions
  • amd a9-9420 firmwareall versions
  • amd athlon gold 3150ge firmwareall versions
  • amd athlon gold 3150u firmwareall versions
  • amd athlon gold 3450g firmwareall versions
  • amd athlon pro 300u firmwareall versions
  • amd athlon silver 3050ge firmwareall versions
  • amd athlon silver 3050u firmwareall versions
  • amd athlon x4 750 firmwareall versions
  • amd athlon x4 760k firmwareall versions
  • amd athlon x4 830 firmwareall versions
  • amd athlon x4 835 firmwareall versions

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 AMD Processors

    • Processor Zen 3not affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernelbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-corebefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-cross-headersbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-debugbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-debug-corebefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-debug-develbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-develbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-docbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-headersbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-modulesbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-modules-extrabefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-toolsbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-tools-libsbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8kernel-tools-libs-develbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8perfbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
AlmaLinux:8python3-perfbefore 4.18.0-372.9.1.el84.18.0-372.9.1.el8
Alpine:v3.14xenbefore 4.15.2-r24.15.2-r2
Debian:12linuxbefore 5.16.12-15.16.12-1
openSUSE:Leap 15.3xenbefore 4.14.4_02-150300.3.21.14.14.4_02-150300.3.21.1
Red Hat:enterprise_linux:7::clientbpftoolbefore 0:3.10.0-1160.83.1.el70:3.10.0-1160.83.1.el7

+96

Same product

amd: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-26341Some AMD CPUs may transiently execute beyond unconditional direct branches, which may potentially result in data leakage.
    26Monitor

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
almalinux:bpftool4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-abi-stablelists4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-core4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-cross-headers4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-core4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-devel4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules-extra4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-devel4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-doc4.18.0-372.9.1.el8 · AlmaLinux:8Package registry (OSV)
alpine:xen4.15.2-r2 · Alpine:v3.14Package registry (OSV)
debian:linux5.16.12-1 · Debian:12Package registry (OSV)
opensuse:xen4.14.4_02-150300.3.21.1 · openSUSE:Leap 15.3Package registry (OSV)
red hat:kernel-rt0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-core0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-devel0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-kvm0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules-extra0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debuginfo0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debuginfo-common-x86_640:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-devel0:4.18.0-372.9.1.rt7.166.el8 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
rocky linux:kernel0:4.18.0-372.9.1.el8 · Rocky Linux:8Package registry (OSV)
rocky linux:kernel-rt0:4.18.0-372.9.1.rt7.166.el8 · Rocky Linux:8Package registry (OSV)
suse:xen4.12.4_20-3.63.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOSPackage 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

—

CVSS vector

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

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.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

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

All records