Dm-verity is used for extending root-of-trust to root filesystems. LoadPin builds on this property to restrict module/firmware loads to just the trusted root filesystem. Device-mapper table reloads currently allow users with root privileges to switch out the target with an equivalent dm-linear target and bypass verification till reboot. This allows root to bypass LoadPin and can be used to load untrusted and unverified kernel modules and firmware, which implies arbitrary kernel execution and persistence for peripherals that do not verify firmware updates. We recommend upgrading past commit 4caae58406f8ceb741603eee460d79bacca9b1b5 https://github.com/google/security-research/security/advisories/GHSA-6vq3-w69p-w63m https://security.netapp.com/advisory/ntap-20230214-0005/
This issue was fixed upstream in kernel version 5.19. The kernel packages as shipped in following Red Hat products were previously updated to a version that contains the fix via the following errata: kernel in Red Hat Enterprise Linux 9 https://access.redhat.com/errata/RHSA-2022:8267 kernel-rt in Red Hat Enterprise Linux 9 https://access.redhat.com/errata/RHSA-2022:7933
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Extended Update Support Via RHSA-2023:5627 https://access.redhat.com/errata/RHSA-2023:5627