RHEL 10 must not accept router advertisements on all Internet Protocol version 6 (IPv6) interfaces by default.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-281358 | RHEL-10-800260 | SV-281358r1167224_rule | CCI-002385 | medium |
| Description | ||||
| An illicit router advertisement message could result in a man-in-the-middle attack. Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00089 | ||||
| STIG | Date | |||
| Red Hat Enterprise Linux 10 Security Technical Implementation Guide | 2026-03-11 | |||
Details
Check Text (C-281358r1167224_chk)
Note: If IPv6 is disabled on the system, this requirement is not applicable.
Verify RHEL 10 does not accept router advertisements on all IPv6 interfaces by default, unless the system is a router.
Check the value of the "net.ipv6.conf.default.accept_ra" variable with the following command:
$ sudo sysctl net.ipv6.conf.default.accept_ra
net.ipv6.conf.default.accept_ra = 0
If "net.ipv6.conf.default.accept_ra" is not set to "0" or is missing, this is a finding.
Fix Text (F-85824r1167223_fix)
Configure RHEL 10 to not accept router advertisements on all IPv6 interfaces by default, unless the system is a router.
Create a configuration file if it does not already exist:
$ sudo vi /etc/sysctl.d/ipv6_accept_ra.conf
Add the following line to the file:
net.ipv6.conf.default.accept_ra = 0
Reload settings from all system configuration files with the following command:
$ sudo sysctl --system