CVE-2020-36387

HIGHNVD 7.87.8—

7.8

An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 18.1%
KEV: Not listed

Published

June 7, 2021

Last Modified

November 21, 2024

References (10)

cve@mitrehttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2
cve@mitrehttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d816e088c359866f9867057e04f244c608c42fe
cve@mitrehttps://security.netapp.com/advisory/ntap-20210727-0006/
cve@mitrehttps://sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_func
cve@mitrehttps://syzkaller.appspot.com/bug?id=ce5f07d6ec3b5050b8f0728a3b389aa510f2591b
af854a3a-2127-422b-91ae-364da2661108https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d816e088c359866f9867057e04f244c608c42fe
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210727-0006/
af854a3a-2127-422b-91ae-364da2661108https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_func
af854a3a-2127-422b-91ae-364da2661108https://syzkaller.appspot.com/bug?id=ce5f07d6ec3b5050b8f0728a3b389aa510f2591b

Weakness Classification(1)

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

CWE-416Use After Free

Data Freshness Timeline

(refreshed 12× in last 7d / 20× 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.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-36387?

CVE-2020-36387 is a high vulnerability published on June 7, 2021. An issue was discovered in the Linux kernel before 5.8.2. fs/iouring.c has a use-after-free related to ioasynctaskfunc and ctx reference holding, aka CID-6d816e088c35.

When was CVE-2020-36387 disclosed?

CVE-2020-36387 was first published in the National Vulnerability Database on June 7, 2021, 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-2020-36387 actively exploited?

CVE-2020-36387 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-36387?

CVE-2020-36387 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2020-36387?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-36387, 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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CVE-2020-36387

📅 Published

🔄 Last Modified

🔗 References (10)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-36387?

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Published

Last Modified

References (10)

Frequently asked(5)

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