Arch Linux Security Advisory ASA-202011-10

Severity: Medium
Date    : 2020-11-10
CVE-ID  : CVE-2020-8694 CVE-2020-25704
Package : linux-hardened
Type    : multiple issues
Remote  : No
Link    :


The package linux-hardened before version 5.9.8.a-1 is vulnerable to
multiple issues including denial of service and information disclosure.


Upgrade to 5.9.8.a-1.

# pacman -Syu "linux-hardened>=5.9.8.a-1"

The problems have been fixed upstream in version 5.9.8.a.


- CVE-2020-8694

A temporary measure would be to remove the ability for non-root users
to read the current RAPL energy reporting metrics.
This can be done with the command:

# sudo chmod 400 /sys/class/powercap/intel_rapl/*/energy_uj

This mitigation will only work on the current boot and will need to be
reapplied at each system boot to remain in effect.


- CVE-2020-8694 (information disclosure)

An information disclosure flaw was found in the Linux kernel's Intel
Running Average Power Limit (RAPL) implementation. A local non-
privileged attacker could infer secrets by measuring power usage and
also infer private data by observing the power usage of calculations
performed on the data.

- CVE-2020-25704 (denial of service)

A memory leak has been found in the perf_event_parse_addr_filter
function of Linux before 5.9.7, leading to a denial of service.


A local attacker might be able to exhaust the memory available on the
system, causing a denial of service, or access sensitive information by
observing the power usage.