A use-after-free flaw was found in the io_uring in Linux kernel, where a local attacker with a user privilege could cause a denial of service problem on the system The issue results from the lack of validating the existence of an object prior to performing operations on the object by not incrementing the file reference counter while in use. The highest threat from this vulnerability is to data integrity, confidentiality and system availability.
Published 2021-02-23 17:15:14
Updated 2023-07-28 17:12:35
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: Memory CorruptionDenial of service

Exploit prediction scoring system (EPSS) score for CVE-2021-20226

Probability of exploitation activity in the next 30 days: 0.27%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 63 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-20226

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
6.1
MEDIUM AV:L/AC:L/Au:N/C:P/I:P/A:C
3.9
8.5
NIST
7.8
HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.8
5.9
NIST

CWE ids for CVE-2021-20226

  • Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
    Assigned by:
    • nvd@nist.gov (Secondary)
    • secalert@redhat.com (Primary)

References for CVE-2021-20226

Products affected by CVE-2021-20226

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