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RHEL-10-701060 - RHEL 10 must restrict exposed kernel pointer address access.
Information
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://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_10_V1R1_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 10 STIG v1r1
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: 4e5d267d626da9b2b92d828e8cc5ed228c07adb1e2a5aaef789392533040d523