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 be configured to use TCP syncookies.

DISA Rule

SV-261320r996861_rule

Vulnerability Number

V-261320

Group Title

SRG-OS-000142-GPOS-00071

Rule Version

SLEM-05-253045

Severity

CAT II

CCI(s)

• CCI-001095 - Manage capacity, bandwidth, or other redundancy to limit the effects of information flooding types of denial of service attacks.

Weight

10

Fix Recommendation

Configure SLEM 5 to use IPv4 TCP syncookies by running the following command as an administrator:

> sudo sysctl -w net.ipv4.tcp_syncookies=1

If "1" 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.tcp_syncookies=1" >> /etc/sysctl.d/99-stig.conf'

> sudo sysctl --system

Check Contents

Verify SLEM 5 is configured to use IPv4 TCP syncookies with the following command:

> sudo sysctl net.ipv4.tcp_syncookies
net.ipv4.tcp_syncookies = 1

If the network parameter "ipv4.tcp_syncookies" is not equal to "1", or nothing is returned, this is a finding.

Vulnerability Number

V-261320

Documentable

False

Rule Version

SLEM-05-253045

Severity Override Guidance

Verify SLEM 5 is configured to use IPv4 TCP syncookies with the following command:

> sudo sysctl net.ipv4.tcp_syncookies
net.ipv4.tcp_syncookies = 1

If the network parameter "ipv4.tcp_syncookies" is not equal to "1", or nothing is returned, this is a finding.

Check Content Reference

M

Target Key

5596