AlmaLinux OS 9 must restrict exposed kernel pointer addresses access.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269423 | ALMA-09-040830 | SV-269423r1117266_rule | CCI-001082 | medium |
| Description | ||||
| Exposing kernel pointers (through procfs or "seq_printf()") exposes kernel writeable structures, which may contain functions pointers. If a write vulnerability occurs in the kernel, allowing write access to any of this structure, the kernel can be compromised. This option disallows any program without the CAP_SYSLOG capability to get the addresses of kernel pointers by replacing them with "0". | ||||
| STIG | Date | |||
| Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide | 2026-02-27 | |||
Related Frameworks
3 paths across 3 frameworks
Related Frameworks
NIST 800-531 mapping
SC-2
1.00
- DISA · V1R6 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1711 mapping
3.13.3
1.00
- DISA · V1R6 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
CCI1 mapping
CCI-001082
1.00
- DISA · V1R6 · disa_xccdf · related
Details
Check Text (C-269423r1117266_chk)
Verify the runtime status of the kernel.kptr_restrict kernel parameter with the following command:
$ sysctl kernel.kptr_restrict
kernel.kptr_restrict = 1
Verify the configuration of the kernel.kptr_restrict kernel parameter with the following command:
$ /usr/lib/systemd/systemd-sysctl --cat-config | egrep -v '^(#|;)' | grep -F kernel.kptr_restrict | tail -1
kernel.kptr_restrict =1
If "kernel.kptr_restrict" is not set to "1" or is missing, this is a finding.
Fix Text (F-73355r1049680_fix)
Configure AlmaLinux OS 9 to restrict exposed kernel pointer addresses access with the following command:
$ echo "kernel.kptr_restrict = 1" > /etc/sysctl.d/60-kptr.conf
Load settings from all system configuration files with the following command:
$ sysctl --system