CVE-2021-3347

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. 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 weekElevated
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
51(Track*)
EG Risk 51/100SSVC: 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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
69.2%
KEV
Not listed

Published

January 29, 2021

Last Modified

February 25, 2026

References (38)

Vendor Advisories for CVE-2021-3347(7)

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

Patch Availability(19)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-virtual-hwe-20.04-edge (5.8.0.49.54) @ groovy2026-05-26ubuntu
ubuntulinux-image-oracle (4.15.0.1069.57) @ xenial2026-05-26ubuntu
ubuntulinux-image-virtual-hwe-18.04-edge (5.4.0.67.70) @ focal2026-05-26ubuntu
ubuntulinux-image-oem-20.04b (5.10.0.1017.18) @ focal2026-05-26ubuntu
redhatkpatch-patch2021-09-14redhat
redhatkernel-0:3.10.0-1062.56.1.el72021-09-14redhat
redhatkernel-0:3.10.0-327.100.1.el72021-08-31redhat
redhatkernel-0:3.10.0-693.90.2.el72021-07-20redhat
redhatkernel-0:3.10.0-957.78.2.el72021-07-20redhat
redhatkernel-0:2.6.32-754.41.2.el62021-07-20redhat
redhatkernel-0:3.10.0-514.90.2.el72021-07-20redhat
redhatkernel-0:3.10.0-1160.31.1.el72021-06-08redhat
redhatkernel-rt-0:3.10.0-1160.31.1.rt56.1169.el72021-06-08redhat
redhatkernel-0:4.18.0-147.48.1.el8_12021-05-25redhat
redhatkernel-alt-0:4.14.0-115.36.1.el7a2021-04-27redhat
redhatkernel-0:4.18.0-193.51.1.el8_22021-04-20redhat
redhatkernel-rt-0:4.18.0-193.51.1.rt13.101.el8_22021-04-20redhat
redhatkernel-0:4.18.0-240.22.1.el8_32021-04-06redhat
redhatkernel-rt-0:4.18.0-240.22.1.rt7.77.el8_32021-04-06redhat

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

(17)

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 / 51× 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 108 total refreshes for this CVE.

  1. 2026-07-23 02:01 UTCEG score recompute
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Frequently asked(5)

What is CVE-2021-3347?
CVE-2021-3347 is a high vulnerability published on January 29, 2021. An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.
When was CVE-2021-3347 disclosed?
CVE-2021-3347 was first published in the National Vulnerability Database on January 29, 2021, with the most recent update on February 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-3347 actively exploited?
CVE-2021-3347 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 69.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-3347?
CVE-2021-3347 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-3347?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3347, 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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