CVE-2021-26401

MEDIUMNVD 5.65.6—

5.6

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

CVSS v3: 5.6
EG Score: 5.6(medium)
EPSS: 32.2%
KEV: Not listed

Published

March 11, 2022

Last Modified

November 21, 2024

References (4)

psirt@amdhttp://www.openwall.com/lists/oss-security/2022/03/18/2
psirt@amdhttps://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1036
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2022/03/18/2
af854a3a-2127-422b-91ae-364da2661108https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1036

Patch Availability(11)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-tools-aws-hwe (4.15.0.1128.118) @ xenial	2026-05-26	ubuntu
ubuntu	linux-tools-4.4.0-239-lowlatency (4.4.0-239.273) @ xenial	2026-05-26	ubuntu
ubuntu	linux-headers-azure-fde (5.4.0.1078.81+cvm1.22) @ focal	2026-05-26	ubuntu
ubuntu	linux-image-lowlatency (5.13.0.41.50) @ impish	2026-05-26	ubuntu
ubuntu	linux-tools-4.4.0-1155-aws (4.4.0-1155.170) @ xenial	2026-05-26	ubuntu
ubuntu	linux-image-4.4.0-1117-aws (4.4.0-1117.123) @ trusty	2026-05-26	ubuntu
redhat	kernel-0:3.10.0-1160.83.1.el7	2023-01-24	redhat
redhat	kernel-rt-0:3.10.0-1160.83.1.rt56.1228.el7	2023-01-24	redhat
redhat	kernel-0:2.6.32-754.49.1.el6	2023-01-17	redhat
redhat	kernel-rt-0:4.18.0-372.9.1.rt7.166.el8	2022-05-10	redhat
redhat	kernel-0:4.18.0-372.9.1.el8	2022-05-10	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(11)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-26401?

CVE-2021-26401 is a medium vulnerability published on March 11, 2022. LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.

When was CVE-2021-26401 disclosed?

CVE-2021-26401 was first published in the National Vulnerability Database on March 11, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-26401 actively exploited?

CVE-2021-26401 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-26401?

CVE-2021-26401 has a CVSS v3 base score of 5.6 (NVD).

How do I remediate CVE-2021-26401?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-26401, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-26401

📅 Published

🔄 Last Modified

🔗 References (4)

Patch Availability(11)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-26401?

🔗 Related CVEs(same vendor)

Same vendor

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same vendor)