Executive Summary

Summary
Title Linux kernel (Xenial HWE) vulnerabilities
Informations
NameUSN-3982-2First vendor Publication2019-05-14
VendorUbuntuLast vendor Modification2019-05-14
Severity (Vendor) N/ARevisionN/A

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:N/I:N/A:C)
Cvss Base Score4.9Attack RangeLocal
Cvss Impact Score6.9Attack ComplexityLow
Cvss Expoit Score3.9AuthenticationNone Required
Calculate full CVSS 2.0 Vectors scores

Detail

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

- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-3982-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 for Ubuntu 14.04 LTS.

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Giorgi Maisuradze, Dan Horea Lutas, Andrei Lutas, Volodymyr Pikhur, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Moritz Lipp, Michael Schwarz, and Daniel Gruss discovered that memory previously stored in microarchitectural fill buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2018-12130)

Brandon Falk, Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida discovered that memory previously stored in microarchitectural load ports of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2018-12127)

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Marina Minkin, Daniel Moghimi, Moritz Lipp, Michael Schwarz, Jo Van Bulck, Daniel Genkin, Daniel Gruss, Berk Sunar, Frank Piessens, and Yuval Yarom discovered that memory previously stored in microarchitectural store buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2018-12126)

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Volodrmyr Pikhur, Moritz Lipp, Michael Schwarz, Daniel Gruss, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida discovered that uncacheable memory previously stored in microarchitectural buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2019-11091)

Matteo Croce, Natale Vinto, and Andrea Spagnolo discovered that the cgroups subsystem of the Linux kernel did not properly account for SCTP socket buffers. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-3874)

Alex Williamson discovered that the vfio subsystem of the Linux kernel did not properly limit DMA mappings. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-3882)

Update instructions:

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

Ubuntu 14.04 ESM:
linux-image-4.4.0-148-generic 4.4.0-148.174~14.04.1
linux-image-4.4.0-148-generic-lpae 4.4.0-148.174~14.04.1
linux-image-4.4.0-148-lowlatency 4.4.0-148.174~14.04.1
linux-image-4.4.0-148-powerpc-e500mc 4.4.0-148.174~14.04.1
linux-image-4.4.0-148-powerpc-smp 4.4.0-148.174~14.04.1
linux-image-4.4.0-148-powerpc64-emb 4.4.0-148.174~14.04.1
linux-image-4.4.0-148-powerpc64-smp 4.4.0-148.174~14.04.1
linux-image-generic-lpae-lts-xenial 4.4.0.148.130
linux-image-generic-lts-xenial 4.4.0.148.130
linux-image-lowlatency-lts-xenial 4.4.0.148.130
linux-image-powerpc-e500mc-lts-xenial 4.4.0.148.130
linux-image-powerpc-smp-lts-xenial 4.4.0.148.130
linux-image-powerpc64-emb-lts-xenial 4.4.0.148.130
linux-image-powerpc64-smp-lts-xenial 4.4.0.148.130
linux-image-virtual-lts-xenial 4.4.0.148.130

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

Please note that fully mitigating the Microarchitectural Data Sampling (MDS) issues (CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, and CVE-2019-11091) requires corresponding processor microcode/firmware updates or, in virtual environments, hypervisor updates.

References:
https://usn.ubuntu.com/usn/usn-3982-2
https://usn.ubuntu.com/usn/usn-3982-1
CVE-2018-12126, CVE-2018-12127, CVE-2018-12130,
CVE-2019-11091, CVE-2019-3874, CVE-2019-3882,
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/MDS

Original Source

Url : http://www.ubuntu.com/usn/USN-3982-2

CWE : Common Weakness Enumeration

%idName
50 %CWE-400Uncontrolled Resource Consumption ('Resource Exhaustion')
50 %CWE-119Failure to Constrain Operations within the Bounds of a Memory Buffer

CPE : Common Platform Enumeration

TypeDescriptionCount
Os1
Os131

Alert History

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0
DateInformations
2019-05-15 05:18:48
  • First insertion