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AUSCERT External Security Bulletin Redistribution
ESB-2019.4270
USN-4187-1: Linux kernel vulnerability
14 November 2019
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AusCERT Security Bulletin Summary
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Product: linux-kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Privileged Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-11135
Reference: ASB-2019.0330
ASB-2019.0322
ESB-2019.4247
ESB-2019.4246
Original Bulletin:
https://usn.ubuntu.com/4187-1/
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USN-4187-1: Linux kernel vulnerability
13 November 2019
linux vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 14.04 ESM
Summary
The system could be made to expose sensitive information.
Software Description
o linux - Linux kernel
Details
Stephan van Schaik, Alyssa Milburn, Sebastian A sterlund, Pietro Frigo, Kaveh
Razavi, Herbert Bos, Cristiano Giuffrida, Giorgi Maisuradze, Moritz Lipp,
Michael Schwarz, Daniel Gruss, and Jo Van Bulck discovered that Intel
processors using Transactional Synchronization Extensions (TSX) could expose
memory contents previously stored in microarchitectural buffers to a malicious
process that is executing on the same CPU core. A local attacker could use this
to expose sensitive information.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 14.04 ESM
linux-image-3.13.0-175-generic - 3.13.0-175.226
linux-image-3.13.0-175-generic-lpae - 3.13.0-175.226
linux-image-3.13.0-175-lowlatency - 3.13.0-175.226
linux-image-generic - 3.13.0.175.186
linux-image-generic-lpae - 3.13.0.175.186
linux-image-lowlatency - 3.13.0.175.186
linux-image-server - 3.13.0.175.186
linux-image-virtual - 3.13.0.175.186
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
Please note that mitigating the TSX (CVE-2019-11135) issue requires a
corresponding Intel processor microcode update.
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
o CVE-2019-11135
o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/TAA_MCEPSC_i915
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