CVE-2021-4028

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-08-25. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
21.7%
KEV
Not listed

Published

August 24, 2022

Last Modified

November 21, 2024

References (12)

Vendor Advisories for CVE-2021-4028(17)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatredhat-virtualization-host-0:4.5.0-202205291010_8.62022-06-03redhat
redhatkernel-0:3.10.0-514.101.1.el72022-05-11redhat
redhatkernel-0:3.10.0-957.94.1.el72022-05-11redhat
redhatkernel-0:3.10.0-693.100.1.el72022-05-11redhat
redhatkpatch-patch2022-05-11redhat
redhatkernel-0:4.18.0-348.23.1.el8_52022-04-26redhat
redhatkernel-rt-0:4.18.0-348.23.1.rt7.153.el8_52022-04-26redhat
redhatkernel-0:3.10.0-1062.66.1.el72022-04-12redhat
redhatredhat-virtualization-host-0:4.3.22-20220330.1.el7_92022-04-07redhat
redhatkernel-rt-0:3.10.0-1160.62.1.rt56.1203.el72022-04-05redhat
redhatkernel-0:3.10.0-1160.62.1.el72022-04-05redhat
redhatkernel-0:4.18.0-147.64.1.el8_12022-03-10redhat
redhatkernel-rt-0:4.18.0-305.40.1.rt7.112.el8_42022-03-08redhat
redhatkernel-0:4.18.0-305.40.1.el8_42022-03-08redhat
redhatkernel-rt-0:4.18.0-193.75.1.rt13.125.el8_22022-02-22redhat
redhatkernel-0:4.18.0-193.75.1.el8_22022-02-22redhat

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.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 13× in last 7d / 50× 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.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-23 02:04 UTCEG score recompute
  2. 2026-07-22 22:50 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-4028?
CVE-2021-4028 is a high vulnerability published on August 24, 2022. A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this…
When was CVE-2021-4028 disclosed?
CVE-2021-4028 was first published in the National Vulnerability Database on August 24, 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-2021-4028 actively exploited?
CVE-2021-4028 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-4028?
CVE-2021-4028 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-4028?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-4028, 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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