STIGQter: STIG Summary: SUSE Linux Enterprise Micro (SLEM) 5 Security Technical Implementation Guide Version: 1 Release: 4 Benchmark Date: 01 Apr 2026:

SLEM 5 must not allow interfaces to accept Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages by default.

DISA Rule

SV-261316r996418_rule

Vulnerability Number

V-261316

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

SLEM-05-253025

Severity

CAT II

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure SLEM 5 to not accept IPv4 ICMP redirect messages by default by running the following command as an administrator:

> sudo sysctl -w net.ipv4.conf.default.accept_redirects=0

If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf":

> sudo sh -c 'echo "net.ipv4.conf.default.accept_redirects=0" >> /etc/sysctl.d/99-stig.conf'

> sudo sysctl --system

Check Contents

Verify SLEM 5 does not accept IPv4 ICMP redirect messages by default with the following command:

> sudo sysctl net.ipv4.conf.default.accept_redirects
net.ipv4.conf.default.accept_redirects = 0

If the network parameter "ipv4.conf.default.accept_redirects" is not equal to "0", or nothing is returned, this is a finding.

Vulnerability Number

V-261316

Documentable

False

Rule Version

SLEM-05-253025

Severity Override Guidance

Check Content Reference

Target Key

5596