The acpi_ns_evaluate() function in drivers/acpi/acpica/nseval.c in the
Linux kernel through 4.12.9 does not flush the operand cache and causes
a kernel stack dump, which allows local users to obtain sensitive
information from kernel memory and bypass the KASLR protection
mechanism (in the kernel through 4.9) via a crafted ACPI table.
Created acpica-tools tracking bugs for this issue:
Affects: fedora-all [bug 1485355]
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1485356]
Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/
The Red Hat Security Response Team has rated this issue as having moderate security impact.
The risks associated with fixing this bug are greater than the moderate
severity security risk. We therefore currently have no plans to fix this flaw
in Red Hat Enterprise Linux 5,6,7 and Red Hat Enterprise MRG.