CVE-2020-15436

MEDIUMNVD 6.76.7—
EchelonGraph scoreMEDIUM confidence

Score 6.7 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 6.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.7Exploit: None knownExposed: 0

A fix is available — apply it.

Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field.

CVSS v3
6.7
EG Score
6.7(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity67% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
58%
KEV
Not listed

Published

November 23, 2020

Last Modified

November 21, 2024

References (4)

Vendor Advisories for CVE-2020-15436(2)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-oem-20.04 (5.6.0.1048.44) @ focal2026-05-23ubuntu
redhatkernel-0:3.10.0-1062.51.1.el72021-06-22redhat
redhatkernel-0:3.10.0-957.72.1.el72021-04-27redhat
redhatkernel-rt-0:3.10.0-1160.15.2.rt56.1152.el72021-02-02redhat
redhatkernel-0:3.10.0-1160.15.2.el72021-02-02redhat
redhatkernel-alt-0:4.14.0-115.35.1.el7a2021-02-02redhat

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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—5.7.6-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.7.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.7.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.7.6-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

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 8× in last 7d / 34× 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 131 total refreshes for this CVE.

  1. 2026-08-20 22:52 UTCEPSS rescore
  2. 2026-08-19 17:00 UTCEPSS rescore
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  22. 2026-07-30 13:44 UTCOSV refresh
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  7. 2026-07-23 01:50 UTCEG score recompute
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  25. 2026-07-12 23:07 UTCOSV refresh
  26. 2026-07-12 05:44 UTCEPSS rescore
  27. 2026-07-11 08:25 UTCEPSS rescore
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  49. 2026-06-24 14:03 UTCEPSS rescore
  50. 2026-06-24 14:03 UTCEPSS rescore
  51. 2026-06-24 08:50 UTCOSV refresh
  52. 2026-06-23 21:31 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2020-15436?
CVE-2020-15436 is a medium vulnerability published on November 23, 2020. Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field.
When was CVE-2020-15436 disclosed?
CVE-2020-15436 was first published in the National Vulnerability Database on November 23, 2020, 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-2020-15436 actively exploited?
CVE-2020-15436 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 42.2% of all scored CVEs.
What is the CVSS score of CVE-2020-15436?
CVE-2020-15436 has a CVSS v3 base score of 6.7 (NVD).
How do I remediate CVE-2020-15436?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-15436, 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.

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