CVE-2021-20177

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 flaw was found in the Linux kernel's implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN) when inserting iptables rules could insert a rule which can panic the system. Kernel before kernel 5.5-rc1 is affected.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1914719

Details

Source: MITRE

Published: 2021-05-26

Updated: 2021-06-02

Type: CWE-125

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: 4.4

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

Impact Score: 3.6

Exploitability Score: 0.8

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to 5.4.9 (inclusive)

Tenable Plugins

View all (16 total)

IDNameProductFamilySeverity
151167EulerOS Virtualization for ARM 64 3.0.6.0 : kernel (EulerOS-SA-2021-2002)NessusHuawei Local Security Checks
high
150213EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-1950)NessusHuawei Local Security Checks
high
149607EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-1879)NessusHuawei Local Security Checks
high
148634EulerOS Virtualization 2.9.1 : kernel (EulerOS-SA-2021-1715)NessusHuawei Local Security Checks
high
148604EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-1751)NessusHuawei Local Security Checks
high
148550Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2021-9038)NessusOracle Linux Local Security Checks
medium
148549Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2021-9037)NessusOracle Linux Local Security Checks
medium
148009Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4750-1)NessusUbuntu Local Security Checks
high
146685SUSE SLES15 Security Update : kernel (SUSE-SU-2021:0532-1)NessusSuSE Local Security Checks
high
146512Debian DLA-2557-1 : linux-4.19 security updateNessusDebian Local Security Checks
high
146406SUSE SLES15 Security Update : kernel (SUSE-SU-2021:0427-1)NessusSuSE Local Security Checks
high
146366SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:0354-1)NessusSuSE Local Security Checks
high
146362SUSE SLES12 Security Update : kernel (SUSE-SU-2021:0348-1)NessusSuSE Local Security Checks
high
146359SUSE SLES12 Security Update : kernel (SUSE-SU-2021:0353-1)NessusSuSE Local Security Checks
high
146293openSUSE Security Update : the Linux Kernel (openSUSE-2021-241)NessusSuSE Local Security Checks
high
146052Debian DSA-4843-1 : linux - security updateNessusDebian Local Security Checks
high