Debian Security Advisory

DLA-1481-1 linux-4.9 -- LTS security update

Date Reported:
28 Aug 2018
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 906769.
In Mitre's CVE dictionary: CVE-2018-3620, CVE-2018-3646.
More information:

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 4.9.110-3+deb9u4~deb8u1.

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: