CVE-2021-0920

6.4 MEDIUM 0.9% exploit odds exploited in the wild Fix listed Memory safety OS & kernel

What it is

In unix_scm_to_skb of af_unix.c, there is a possible use after free bug due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-196926917References: Upstream kernel

At a glance

Exploitability: Can be exploited locally on the machine with an admin-level account. High risk of data exposure, data tampering, service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-11-06 00:00 UTC ReservedThe CVE id was reserved by its CNA
2021-12-15 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2022-05-23 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2022-06-13 Remediation deadlineCISA's due date for federal agencies to fix it
2026-06-17 03:30 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 0.9% in the next 30 days (EPSS).
Severity: 6.4 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-12-15 19:15 UTC
Last modified: 2026-06-17 03:30 UTC
Added to CISA KEV: 2022-05-23
Exploit probability: 0.9% · EPSS, next 30 days
Weakness: CWE-362 · Race condition
Record status: Analyzed

Affected

Linux Kernel ≤ 5.13
Linux Kernel 5.14
Google Android
Debian Linux 9.0

Attack profile CVSS 3.1 · 6.4

Attack vector: Local
Complexity: High
Privileges needed: High
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-0920.md and follow it. Check whether this project is affected by CVE-2021-0920. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record