STIGQter: STIG Summary: Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide Version: 1 Release: 7 Benchmark Date: 01 Jul 2026:

AlmaLinux OS 9 must disable virtual system calls.

DISA Rule

SV-269306r1050188_rule

Vulnerability Number

V-269306

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

ALMA-09-025650

Severity

CAT II

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Document the use of virtual system calls with the ISSO as an operational requirement, or disable them with the following command:

$ grubby --update-kernel=ALL --args="vsyscall=none"

Add or modify the following line in "/etc/default/grub" to ensure the configuration survives kernel updates:

GRUB_CMDLINE_LINUX="vsyscall=none"

Check Contents

Verify the current GRUB 2 configuration disables virtual system calls with the following command:

$ grubby --info=ALL | grep args | grep -v 'vsyscall=none'

If any output is returned, this is a finding.

Check that virtual system calls are disabled by default to persist in kernel updates with the following command:

$ grep vsyscall /etc/default/grub

GRUB_CMDLINE_LINUX="vsyscall=none"

If "vsyscall" is not set to "none", is missing or commented out, and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

Vulnerability Number

V-269306

Documentable

False

Rule Version

ALMA-09-025650

Severity Override Guidance

Check Content Reference

Target Key

5664