STIGQter STIGQter: STIG Summary: Red Hat Enterprise Linux 9 Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 2026:

RHEL 9 network interfaces must not be in promiscuous mode.

DISA Rule

SV-257941r991589_rule

Vulnerability Number

V-257941

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-09-251040

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure network interfaces to turn off promiscuous mode unless approved by the ISSO and documented.

Set the promiscuous mode of an interface to off with the following command:

$ sudo ip link set dev <devicename> multicast off promisc off

Check Contents

Verify network interfaces are not in promiscuous mode with the following command:

$ ip link | grep -i promisc

If network interfaces are found on the system in promiscuous mode and their use has not been approved by the ISSO and documented, this is a finding.

Vulnerability Number

V-257941

Documentable

False

Rule Version

RHEL-09-251040

Severity Override Guidance

Verify network interfaces are not in promiscuous mode with the following command:

$ ip link | grep -i promisc

If network interfaces are found on the system in promiscuous mode and their use has not been approved by the ISSO and documented, this is a finding.

Check Content Reference

M

Target Key

5551