CVE-2021-20219

CVSS V2 Low 2.1 CVSS V3 Medium 5.5

Description

A denial of service vulnerability was found in n_tty_receive_char_special in drivers/tty/n_tty.c of the Linux kernel. In this flaw a local attacker with a normal user privilege could delay the loop (due to a changing ldata->read_head, and a missing sanity check) and cause a threat to the system availability.

Overview

CVE ID
CVE-2021-20219

Assigner
secalert@redhat.com

Vulnerability Status
Analyzed

Published Version
2021-03-23T17:15:13

Last Modified Date
2021-03-26T19:48:33

Weakness Enumerations

CWE	URL
CWE-697	http://cwe.mitre.org/data/definitions/697.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
cpe:2.3:o:linux:linux_kernel::::::::	1	OR		4.18

CVSS Version 2

Version
2.0

Vector String
AV:L/AC:L/Au:N/C:N/I:N/A:P

Access Vector
LOCAL

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
NONE

Integrity Impact
NONE

Availability Impact
PARTIAL

Base Score
2.1

Severity
LOW

Exploitability Score
3.9

Impact Score
2.9

CVSS Version 3

Version
3.1

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

Attack Vector
LOCAL

Attack Compatibility
LOW

Privileges Required
LOW

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
NONE

Availability Impact
HIGH

Base Score
5.5

Base Severity
MEDIUM

Exploitability Score
1.8

Impact Score
3.6

References

Reference URL	Reference Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1923738	Issue Tracking Third Party Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-20219
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20219

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 07:18:31				Added to TrackCVE
2022-12-06 00:14:50	2021-03-23T17:15Z	2021-03-23T17:15:13	CVE Published Date	updated
2022-12-06 00:14:50		2021-03-26T19:48:33	CVE Modified Date	updated
2022-12-06 00:14:50		Analyzed	Vulnerability Status	updated