RHEL 9 must restrict exposed kernel pointer addresses access.
An XCCDF Rule
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". Satisfies: SRG-OS-000132-GPOS-00067, SRG-OS-000433-GPOS-00192, SRG-OS-000480-GPOS-00227
- ID
- SV-257800r1044851_rule
- Version
- RHEL-09-213025
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Add or edit the following line in a system configuration file in the "/etc/sysctl.d/" directory:
kernel.kptr_restrict = 1
Reload settings from all system configuration files with the following command:
$ sudo sysctl --system