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CVE-2021-4023

Good to know:

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Date: March 9, 2022

A flaw was found in the io-workqueue implementation in the Linux kernel versions prior to 5.15-rc1. The kernel can panic when an improper cancellation operation triggers the submission of new io-uring operations during a shortage of free space. This flaw allows a local user with permissions to execute io-uring requests to possibly crash the system.

Language: C

Severity Score

Related Resources (6)

https://bugzilla.redhat.com/show_bug.cgi?id=2026484
https://github.com/torvalds/linux/commit/713b9825a4c47897f66ad69409581e7734a8728e
https://nvd.nist.gov/vuln/detail/CVE-2021-4023
https://security-tracker.debian.org/tracker/CVE-2021-4023
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-4023
https://www.mend.io/vulnerability-database/CVE-2021-4023

Severity Score

Weakness Type (CWE)

Exposure of Sensitive Information to an Unauthorized Actor

CWE-200

Insufficient Information

NVD-CWE-noinfo

Top Fix

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Upgrade Version

Upgrade to version linux-libc-headers - 5.14

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): COMPLETE
Additional information:

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