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1.377 RHEL-10-701060

Information

RHEL 10 must restrict exposed kernel pointer address access.

GROUP ID: V-281308RULE ID: SV-281308r1167074

Exposing kernel pointers (through procfs or "seq_printf()") exposes kernel writable 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

Solution

Configure RHEL 10 to restrict exposed kernel pointer address access.

Create a drop-in if it does not already exist:

$ sudo vi /etc/sysctl.d/99-kernel_kptr_restrict.conf

Add the following to the file:

kernel.kptr_restrict = 1

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

$ sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/26403

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION, SYSTEM AND INFORMATION INTEGRITY

References: 800-53|SC-2, 800-53|SI-16, CAT|II, CCI|CCI-001082, CCI|CCI-002824, Rule-ID|SV-281308r1167074_rule, STIG-ID|RHEL-10-701060, Vuln-ID|V-281308

Plugin: Unix

Control ID: 6a3cd5aa37e6532140a3c16b63e0172e73534f439b93ced0c0b2a53378e84a11