PT-2021-2467 · Linux+2 · Linux Kernel+2

Evgenii Shatokhin + 1 · Published 2018-08-21 · Updated 2021-05-18 · CVE-2021-20219

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A denial of service issue was found in the n tty receive char special function in the Linux kernel, specifically in drivers/tty/n tty.c. This flaw allows a local attacker with normal user privileges to delay a loop due to a changing ldata->read head and a missing sanity check, posing a threat to system availability. The vulnerability is related to incorrect input data used as a condition for executing a cycle.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Improper Resource Release

Weakness Enumeration

CWE-404

CWE-697

CWE-606

Related Identifiers

ALT-PU-2018-2192

ALT-PU-2018-2210

ALT-PU-2019-1433

BDU:2021-01834

CVE-2021-20219

SUSE-SU-2021:1210-1

SUSE-SU-2021:1248-1

SUSE-SU-2021:1266-1

SUSE-SU-2021:1573-1

SUSE-SU-2021:1596-1

SUSE-SU-2021:1617-1

SUSE-SU-2021:1623-1

SUSE-SU-2021:1624-1

Affected Products

Alt Linux

Linux Kernel

Suse

References · 207

• https://osv.dev/vulnerability/SUSE-SU-2021:1248-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-20219 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2021:1266-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-01834 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2021:1623-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-20219 · Security Note
• https://linux.oracle.com/errata/ELSA-2021-9215.html · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:1573-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:1624-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-20219 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:1617-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:1210-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:1596-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-20219 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-20219 · Vendor Advisory