STIGQter: STIG Summary: Red Hat Enterprise Linux 10 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 01 Jul 2026:

RHEL 10 must use a reverse-path filter for Internet Protocol version 4 (IPv4) network traffic when possible by default.

DISA Rule

SV-281348r1167194_rule

Vulnerability Number

V-281348

Group Title

SRG-OS-000420-GPOS-00186

Rule Version

RHEL-10-800160

Severity

CAT II

CCI(s)

• CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.
• CCI-001103 - Establish a traffic flow policy for each managed interface for each external telecommunication service.

Weight

10

Fix Recommendation

Configure RHEL 10 to use reverse path filtering on IPv4 interfaces by default.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/ipv4_rp_filter.conf

Add the following line to the file:

net.ipv4.conf.default.rp_filter = 1

Reload settings from all system configuration files with the following command:

$ sudo sysctl --system

Check Contents

Verify RHEL 10 uses reverse path filtering on IPv4 interfaces.

Check the value of the "net.ipv4.conf.default.rp_filter" with the following command:

$ sudo sysctl net.ipv4.conf.default.rp_filter
net.ipv4.conf.default.rp_filter = 1

If the returned line does not have a value of "1", or a line is not returned, this is a finding.

Vulnerability Number

V-281348

Documentable

False

Rule Version

RHEL-10-800160

Severity Override Guidance

Verify RHEL 10 uses reverse path filtering on IPv4 interfaces.

Check the value of the "net.ipv4.conf.default.rp_filter" with the following command:

$ sudo sysctl net.ipv4.conf.default.rp_filter
net.ipv4.conf.default.rp_filter = 1

If the returned line does not have a value of "1", or a line is not returned, this is a finding.

Check Content Reference

M

Target Key

5733