[ASA-201801-6] linux-lts: access restriction bypass
anthraxx at archlinux.org
Mon Jan 8 22:01:41 UTC 2018
Arch Linux Security Advisory ASA-201801-6
Date : 2018-01-08
CVE-ID : CVE-2017-5754
Package : linux-lts
Type : access restriction bypass
Remote : No
Link : https://security.archlinux.org/AVG-577
The package linux-lts before version 4.9.75-1 is vulnerable to access
Upgrade to 4.9.75-1.
# pacman -Syu "linux-lts>=4.9.75-1"
The problem has been fixed upstream in version 4.9.75.
An industry-wide issue was found in the way many modern microprocessor
designs have implemented speculative execution of instructions (a
commonly used performance optimization).
This variant ("Rogue Data Load") relies on the fact that, on impacted
microprocessors, during speculative execution of instruction permission
faults, exception generation triggered by a faulting access is
suppressed until the retirement of the whole instruction block. In a
combination with the fact that memory accesses may populate the cache
even when the block is being dropped and never committed (executed), an
unprivileged local attacker could use this flaw to read memory from
arbitrary addresses, including privileged (kernel space) and all other
processes running on the system by conducting targeted cache side-
A local unprivileged attacker is able to read memory from arbitrary
addresses including the kernel and all other processes running on the
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