CVE-2021-20219

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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

https://bugzilla.redhat.com/show_bug.cgi?id=1923738

Details

Source: MITRE

Published: 2021-03-23

Updated: 2021-03-26

Type: CWE-697

Risk Information

CVSS v2

Base Score: 2.1

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

Impact Score: 2.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 5.5

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

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Tenable Plugins

View all (9 total)

IDNameProductFamilySeverity
150463OracleVM 3.4 : Unbreakable / etc (OVMSA-2021-0016)NessusOracleVM Local Security Checks
high
149717SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1624-1)NessusSuSE Local Security Checks
high
149716SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1623-1)NessusSuSE Local Security Checks
high
149633SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1617-1)NessusSuSE Local Security Checks
high
149491SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1596-1)NessusSuSE Local Security Checks
high
149462SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1573-1)NessusSuSE Local Security Checks
high
149296Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2021-9215)NessusOracle Linux Local Security Checks
high
148753SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1248-1)NessusSuSE Local Security Checks
high
148700SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1210-1)NessusSuSE Local Security Checks
high