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Ubuntu 16.04 LTS USN-3654-1 Critical: Kernel Threats Summary

ubuntu
Calendar Grey May 22, 2018
Scroller Ubuntu
The latest patch for Ubuntu 16.04 LTS resolves significant vulnerabilities in the Linux kernel that could affect system security and stability.
Several security issues were addressed in the Linux kernel.

Summary

Several security issues were addressed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-kvm: Linux kernel for cloud environments

Details:

Jann Horn and Ken Johnson discovered that microprocessors utilizing

speculative execution of a memory read may allow unauthorized memory

reads via a sidechannel attack. This flaw is known as Spectre

Variant 4. A local attacker could use this to expose sensitive

information, including kernel memory. (CVE-2018-3639)

Tuba Yavuz discovered that a double-free error existed in the USBTV007

driver of the Linux kernel. A local attacker could use this to cause a

denial of service (system crash) or possibly execute arbitrary code.

(CVE-2017-17975)

It was discovered that a race condition existed in the F2FS implementation

in the Linux kernel. A local attacker could use this to cause a denial of

service (system crash). (CVE-2017-18193)

It was discovered that a buffe...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory Ubuntu kernel information exposure Denial of Service system crash

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1026-kvm      4.4.0-1026.31
  linux-image-4.4.0-1060-aws      4.4.0-1060.69
  linux-image-4.4.0-127-generic   4.4.0-127.153
  linux-image-4.4.0-127-generic-lpae  4.4.0-127.153
  linux-image-4.4.0-127-lowlatency  4.4.0-127.153
  linux-image-4.4.0-127-powerpc-e500mc  4.4.0-127.153
  linux-image-4.4.0-127-powerpc-smp  4.4.0-127.153
  linux-image-4.4.0-127-powerpc64-emb  4.4.0-127.153
  linux-image-4.4.0-127-powerpc64-smp  4.4.0-127.153
  linux-image-aws                 4.4.0.1060.62
  linux-image-generic             4.4.0.127.133
  linux-image-generic-lpae        4.4.0.127.133
  linux-image-kvm                 4.4.0.1026.25
  linux-image-lowlatency          4.4.0.127.133
  linux-image-powerpc-e500mc      4.4.0.127.133
  linux-image-powerpc-smp         4.4.0.127.133
  linux-image-powerpc64-emb       4.4.0.127.133
  linux-image-powerpc64-smp       4.4.0.127.133

Please note that fully mitigating CVE-2018-3639 (Spectre Variant 4)
may require corresponding processor microcode/firmware updates or,
in virtual environments, hypervisor updates. On i386 and amd64
architectures, the SSBD feature is required to enable the kernel
mitigations. BIOS vendors will be making updates available for Intel
processors that implement SSBD and Ubuntu is working with Intel to
provide future microcode updates. Ubuntu users with a processor from
a different vendor should contact the vendor to identify necessary
firmware updates. Ubuntu provided corresponding QEMU updates for usersof self-hosted virtual environments in USN 3651-1. Ubuntu users in
cloud environments should contact the cloud provider to confirm that
the hypervisor has been updated to expose the new CPU features to
virtual machines.

References

https://ubuntu.com/security/notices/USN-3654-1

CVE-2017-17975, CVE-2017-18193, CVE-2017-18222, CVE-2018-1065,

CVE-2018-1068, CVE-2018-1130, CVE-2018-3639, CVE-2018-5803,

CVE-2018-7480, CVE-2018-7757, CVE-2018-7995, CVE-2018-8781,

CVE-2018-8822,

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Variant4

Severity
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Critical

May 22, 2018

Topics%20covered

Topics Covered

security advisory Ubuntu kernel information exposure Denial of Service system crash

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-127.153
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1060.69
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1026.31

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