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

RHEL 10 must not forward Internet Protocol version 4 (IPv4) source-routed packets.

DISA Rule

SV-281342r1167176_rule

Vulnerability Number

V-281342

Group Title

SRG-OS-000420-GPOS-00186

Rule Version

RHEL-10-800100

Severity

CAT II

CCI(s)

• CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.
• CCI-001097 - Monitor and control communications at the external managed interfaces to the system and at key managed interfaces within the system.

Weight

10

Fix Recommendation

Configure RHEL 10 to ignore IPv4 source-routed packets.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/99-ipv4_accept_source.conf

Add the following line to the file:

net.ipv4.conf.all.accept_source_route = 0

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

$ sudo sysctl --system

Check Contents

Verify RHEL 10 will not accept IPv4 source-routed packets.

Check the value of the "net.ipv4.conf.all.accept_source_route" variable with the following command:

$ sudo sysctl net.ipv4.conf.all.accept_source_route
net.ipv4.conf.all.accept_source_route = 0

If "net.ipv4.conf.all.accept_source_route" is not set to "0" or is missing, this is a finding.

Vulnerability Number

V-281342

Documentable

False

Rule Version

RHEL-10-800100

Severity Override Guidance

Verify RHEL 10 will not accept IPv4 source-routed packets.

Check the value of the "net.ipv4.conf.all.accept_source_route" variable with the following command:

$ sudo sysctl net.ipv4.conf.all.accept_source_route
net.ipv4.conf.all.accept_source_route = 0

If "net.ipv4.conf.all.accept_source_route" is not set to "0" or is missing, this is a finding.

Check Content Reference

M

Target Key

5733