CVE-2018-20836

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in the Linux kernel before 4.20. There is a race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c, leading to a use-after-free.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity81% × 45%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
5%
EPSS %ILE
92%
KEV
Not listed

Published

May 7, 2019

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Sep 15, 2026
Patch available. Sources: github_commit.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20190719-0003/
generic

Bugtraq: [SECURITY] [DSA 4497-1] linux security update

https://seclists.org/bugtraq/2019/Aug/18
generic

Bugtraq: [SECURITY] [DSA 4495-1] linux security update

https://seclists.org/bugtraq/2019/Aug/13
generic Patch Available

[SECURITY] [DLA 1885-1] linux-4.9 security update

https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html
generic Patch Available

[SECURITY] [DLA 1884-1] linux security update

https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html
github_commit

commit b90cd6f2b905 (torvalds/linux)

Fix landed in torvalds/linux commit b90cd6f2b905 — awaiting tagged release

https://github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16ae
generic

scsi: libsas: fix a race condition when smp task timeout - kernel/git/torvalds/linux.git - Linux kernel source tree

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b90cd6f2b905905fb42671009dc0e27c310a16ae
generic

CVE-2018-20836 - PSIRT.COM

http://www.securityfocus.com/bid/108196

Vendor Advisories for CVE-2018-20836(3)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-virtual-lts-xenial (4.4.0.157.165) @ xenial2026-05-27ubuntu
redhatkernel-0:3.10.0-1062.43.1.el72021-01-05redhat
redhatkernel-0:3.10.0-957.65.1.el72020-12-22redhat
redhatkernel-rt-0:3.10.0-1160.rt56.1131.el72020-09-29redhat
redhatkernel-0:3.10.0-1160.el72020-09-29redhat

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

(8 across 7 ecosystems)
Debian:8(2)
PackageVulnerable rangeFixed inDependents
linux3.16.36-1 ... 3.16.70-1 (66 versions)3.16.72-1—
linux-4.94.9.110-1~deb8u1, 4.9.144-3.1~deb8u1, 4.9.168-1~deb8u14.9.168-1+deb9u5~deb8u1—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
linux4.19.37-5, 4.19.37-5+deb10u1, 4.19.37-5+deb10u2~bpo9+14.19.37-5+deb10u2—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—5.2.6-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.2.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.2.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.2.6-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
linux4.9.107-1 ... 4.9.88-1~bpo8+1 (50 versions)4.9.168-1+deb9u5—

Weakness Classification(2)

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

Additional Vendor Advisories

(2)

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 5× in last 7d / 23× 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 146 total refreshes for this CVE.

  1. 2026-09-18 19:22 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 05:06 UTCEPSS rescore
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  22. 2026-08-21 22:44 UTCOSV refresh
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  1. 2026-08-17 13:43 UTCEPSS rescore
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  11. 2026-08-06 04:51 UTCOSV refresh
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  22. 2026-07-23 14:15 UTCEPSS rescore
  23. 2026-07-23 01:35 UTCEG score recompute
  24. 2026-07-22 22:15 UTCEG score recompute
  25. 2026-07-22 14:05 UTCEPSS rescore
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  27. 2026-07-20 17:04 UTCEPSS rescore
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  29. 2026-07-20 17:02 UTCOSV refresh
  30. 2026-07-19 14:28 UTCEPSS rescore
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  50. 2026-07-04 06:28 UTCEPSS rescore
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  52. 2026-07-03 12:26 UTCOSV refresh
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  75. 2026-06-18 17:50 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-20836?
CVE-2018-20836 is a high vulnerability published on May 7, 2019. An issue was discovered in the Linux kernel before 4.20. There is a race condition in smptasktimedout() and smptaskdone() in drivers/scsi/libsas/sas_expander.c, leading to a use-after-free.
When was CVE-2018-20836 disclosed?
CVE-2018-20836 was first published in the National Vulnerability Database on May 7, 2019, 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-2018-20836 actively exploited?
CVE-2018-20836 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5% probability of exploitation in the next 30 days, which ranks it in the top 8.0% of all scored CVEs.
What is the CVSS score of CVE-2018-20836?
CVE-2018-20836 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2018-20836?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20836, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-20836

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