7.4
CWE
358 264
Advisory Published
CVE Published
Updated

CVE-2016-3699

First published: Sat Mar 05 2016(Updated: )

A vulnerability was found in the RHEL7.2 kernel. When RHEL 7.2 is booted with UEFI Secure Boot enabled, securelevel is set. The kernel uses the state of securelevel to prevent userspace from inserting untrusted privileged code at runtime. The ACPI tables provided by firmware can be overwritten using the initrd. From the kernel documentation: If the ACPI_INITRD_TABLE_OVERRIDE compile option is true, it is possible to override nearly any ACPI table provided by the BIOS with an instrumented, modified one. RHEL 7.2 has CONFIG_ACPI_INITRD_TABLE_OVERRIDE kernel config option enabled, and will load ACPI tables appended to the initrd, even if booted with UEFI Secure Boot enabled and securelevel set. Upstream patch: <a href="https://github.com/mjg59/linux/commit/a4a5ed2835e8ea042868b7401dced3f517cafa76">https://github.com/mjg59/linux/commit/a4a5ed2835e8ea042868b7401dced3f517cafa76</a>

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:3.10.0-514.rt56.420.el7
0:3.10.0-514.rt56.420.el7
redhat/kernel<0:3.10.0-514.el7
0:3.10.0-514.el7
Linux Linux kernel
Redhat Enterprise Mrg=2.0
Redhat Linux=7.2

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