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: 0.9%CVSS: 6.7Exploit: None knownExposed services: Not assessed

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
6.7MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.9%
EPSS %ILE
59th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

November 23, 2020

Last Modified

November 21, 2024

References (4)

Vendor Advisories for CVE-2020-15436(3)

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
linux—
  • every version up to 5.7.6-1: fixed in 5.7.6-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.7.6-1: fixed in 5.7.6-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.7.6-1: fixed in 5.7.6-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.7.6-1: fixed in 5.7.6-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(4)

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 6× in last 7d / 29× 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 172 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-10-02 16:22 UTCEPSS rescore
  5. 2026-09-30 15:12 UTCEG score recompute
  6. 2026-09-30 14:59 UTCEPSS rescore
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  15. 2026-09-19 21:52 UTCOSV refresh
  16. 2026-09-18 19:23 UTCEPSS rescore
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  1. 2026-09-10 09:29 UTCEPSS rescore
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  9. 2026-09-01 03:32 UTCEPSS rescore
  10. 2026-09-01 01:34 UTCOSV refresh
  11. 2026-08-30 19:14 UTCEPSS rescore
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  22. 2026-08-16 02:11 UTCEPSS rescore
  23. 2026-08-15 01:26 UTCEPSS rescore
  24. 2026-08-15 01:22 UTCOSV refresh
  25. 2026-08-13 21:57 UTCEPSS rescore
  26. 2026-08-12 13:47 UTCEPSS rescore
  27. 2026-08-09 13:43 UTCEPSS rescore
  28. 2026-08-08 16:33 UTCEPSS rescore
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  30. 2026-08-06 13:43 UTCEPSS rescore
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  37. 2026-07-30 16:25 UTCEPSS rescore
  38. 2026-07-30 13:44 UTCOSV refresh
  39. 2026-07-30 01:27 UTCEPSS rescore
  40. 2026-07-28 15:32 UTCEPSS rescore
  41. 2026-07-27 14:06 UTCEPSS rescore
  42. 2026-07-26 14:51 UTCEPSS rescore
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  44. 2026-07-25 14:14 UTCEPSS rescore
  45. 2026-07-24 14:14 UTCEPSS rescore
  46. 2026-07-23 14:15 UTCEPSS rescore
  47. 2026-07-23 14:15 UTCEPSS rescore
  48. 2026-07-23 01:50 UTCEG score recompute
  49. 2026-07-22 22:35 UTCEG score recompute
  50. 2026-07-22 14:05 UTCEPSS rescore
  51. 2026-07-21 15:22 UTCEPSS rescore
  52. 2026-07-21 15:22 UTCEPSS rescore
  53. 2026-07-20 17:04 UTCEPSS rescore
  54. 2026-07-20 17:04 UTCEPSS rescore
  55. 2026-07-19 14:28 UTCEPSS rescore
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  64. 2026-07-13 06:10 UTCEPSS rescore
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  66. 2026-07-12 23:07 UTCOSV refresh
  67. 2026-07-12 05:44 UTCEPSS rescore
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  70. 2026-07-09 19:07 UTCEPSS rescore
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  72. 2026-07-07 13:43 UTCEPSS rescore
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  74. 2026-07-06 16:25 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 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 0.9% probability of exploitation in the next 30 days (59th percentile of EPSS-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?
A fix for CVE-2020-15436 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-15436 are linked in the Vendor Advisories panel on this page.

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