CVE-2021-20219

MEDIUM

Linux Kernel < 4.18 - Denial of Service via n_tty_receive_char_special

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References
Issue Tracking, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1923738

Scores

CVSS v3 5.5
EPSS 0.0040
EPSS Percentile 31.6%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-697
Status published
Products (1)
linux/linux_kernel < 4.18
Published Mar 23, 2021
Tracked Since Feb 18, 2026