A flaw was found in the way ACPI table loading through acpi_configfs was handled when the kernel was locked down. A (root) privileged local user could use this flaw to circumvent the kernel lockdown restrictions.
Statement: This issue is rated as having Moderate impact because of the privileges required for exploitation.
External References: https://www.openwall.com/lists/oss-security/2020/06/15/3 https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language-2.sh
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1852963]
Mitigation: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Mitigation is https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=75b0cea7bf307f362057cc778efe89af4c615354
This is fixed for Fedora with the 5.7.7 stable kernel updates.
*** Bug 1857894 has been marked as a duplicate of this bug. ***
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:3218 https://access.redhat.com/errata/RHSA-2020:3218
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:3219 https://access.redhat.com/errata/RHSA-2020:3219
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-15780
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.1 Extended Update Support Via RHSA-2020:3222 https://access.redhat.com/errata/RHSA-2020:3222
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions Via RHSA-2020:3228 https://access.redhat.com/errata/RHSA-2020:3228