==========================================================================
Ubuntu Security Notice USN-3823-1
November 15, 2018

linux vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 12.04 ESM

Summary:

Several security issues were mitigated in the Linux kernel.

Software Description:
– linux: Linux kernel

Details:

It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker in a guest virtual machine could use this to expose sensitive
information (memory from other guests or the host OS). (CVE-2018-3646)

It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker could use this to expose sensitive information (memory from the
kernel or other processes). (CVE-2018-3620)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 ESM:
linux-image-3.2.0-137-generic 3.2.0-137.183
linux-image-3.2.0-137-generic-pae 3.2.0-137.183
linux-image-3.2.0-137-highbank 3.2.0-137.183
linux-image-3.2.0-137-omap 3.2.0-137.183
linux-image-3.2.0-137-powerpc-smp 3.2.0-137.183
linux-image-3.2.0-137-powerpc64-smp 3.2.0-137.183
linux-image-3.2.0-137-virtual 3.2.0-137.183
linux-image-generic 3.2.0.137.152
linux-image-generic-pae 3.2.0.137.152
linux-image-highbank 3.2.0.137.152
linux-image-omap 3.2.0.137.152
linux-image-powerpc 3.2.0.137.152
linux-image-powerpc-smp 3.2.0.137.152
linux-image-powerpc64-smp 3.2.0.137.152
linux-image-virtual 3.2.0.137.152

Please note that the recommended mitigation for CVE-2018-3646 involves
updating processor microcode in addition to updating the kernel;
however, the kernel includes a fallback for processors that have not
received microcode updates.

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
https://usn.ubuntu.com/usn/usn-3823-1
CVE-2018-3620, CVE-2018-3646,
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF

—–BEGIN PGP SIGNATURE—–
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=mZJ9
—–END PGP SIGNATURE—–
—