STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

TOSS must prevent IPv6 Internet Control Message Protocol (ICMP) redirect messages from being accepted.

DISA Rule

SV-253131r991589_rule

Vulnerability Number

V-253131

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-04-040900

Severity

CAT II

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure TOSS to prevent IPv6 ICMP redirect messages from being accepted with the following command:

$ sudo sysctl -w net.ipv6.conf.default.accept_redirects=0

If "0" is not the system's default value then add or update the following line in the appropriate file under "/etc/sysctl.d":

net.ipv6.conf.default.accept_redirects=0

Check Contents

Verify TOSS will not accept IPv6 ICMP redirect messages.

Note: If IPv6 is disabled on the system, this requirement is Not Applicable.

Check the value of the default "accept_redirects" variables with the following command:

$ sudo sysctl net.ipv6.conf.default.accept_redirects

net.ipv6.conf.default.accept_redirects = 0

If the returned line does not have a value of "0", a line is not returned, or the line is commented out, this is a finding.

Vulnerability Number

V-253131

Documentable

False

Rule Version

TOSS-04-040900

Severity Override Guidance

Check Content Reference

Target Key

5469