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AUSCERT External Security Bulletin Redistribution
[DLA 1481-1] linux-4.9 security update
29 August 2018
AusCERT Security Bulletin Summary
Product: Linux kernel
Operating System: Debian GNU/Linux 8
Impact/Access: Access Privileged Data -- Existing Account
CVE Names: CVE-2018-3646 CVE-2018-3620
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Package : linux-4.9
Version : 4.9.110-3+deb9u4~deb8u1
CVE ID : CVE-2018-3620 CVE-2018-3646
Debian Bug : 906769
Multiple researchers have discovered a vulnerability in the way the
Intel processor designs have implemented speculative execution of
instructions in combination with handling of page-faults. This flaw
could allow an attacker controlling an unprivileged process to read
memory from arbitrary (non-user controlled) addresses, including from
the kernel and all other processes running on the system or cross
guest/host boundaries to read host memory.
To fully resolve these vulnerabilities it is also necessary to install
updated CPU microcode (only available in Debian non-free). Common server
class CPUs are covered in the update released as DLA 1446-1.
For Debian 8 "Jessie", these problems have been fixed in version
We recommend that you upgrade your linux-4.9 packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
Ben Hutchings - Debian developer, member of kernel, installer and LTS teams
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