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CVE-2021-4023

MEDIUM
5.5
CVSS Score
Published: March 9, 2022 at 04:49 PM UTC
Updated: June 17, 2026 at 04:18 AM UTC
3 products affected across 3 vendorsLinux KernelFedoraKernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
35
Linux Kernel· Linux
95%
v ≤ 5.14
Kernel· Red Hat
60%
v < 5.15-rc1
Affected range stops below 5.15-rc1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2026484

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200NVD-CWE-noinfo

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