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

RHEL 10 must ignore IPv6 Internet Control Message Protocol (ICMP) redirect messages.

DISA Rule

SV-281355r1167215_rule

Vulnerability Number

V-281355

Group Title

SRG-OS-000420-GPOS-00186

Rule Version

RHEL-10-800230

Severity

CAT II

CCI(s)

• CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.

Weight

10

Fix Recommendation

Configure RHEL 10 to ignore Internet Protocol version 6 (IPv6) ICMP redirect messages.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/ipv6_accept_redirects.conf

Add the following line to the file:

net.ipv6.conf.all.accept_redirects = 0

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

$ sudo sysctl --system

Check Contents

Note: If IPv6 is disabled on the system, this requirement is not applicable.

Verify RHEL 10 ignores IPv6 ICMP redirect messages.

Check the value of the "net.ipv6.conf.all.accept_redirects" variable with the following command:

$ sysctl net.ipv6.conf.all.accept_redirects
net.ipv6.conf.all.accept_redirects = 0

If "net.ipv6.conf.all.accept_redirects" is not set to "0" or is missing, this is a finding.

Vulnerability Number

V-281355

Documentable

False

Rule Version

RHEL-10-800230

Severity Override Guidance

Note: If IPv6 is disabled on the system, this requirement is not applicable.

Verify RHEL 10 ignores IPv6 ICMP redirect messages.

Check the value of the "net.ipv6.conf.all.accept_redirects" variable with the following command:

$ sysctl net.ipv6.conf.all.accept_redirects
net.ipv6.conf.all.accept_redirects = 0

If "net.ipv6.conf.all.accept_redirects" is not set to "0" or is missing, this is a finding.

Check Content Reference

M

Target Key

5733