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Ubuntu Security Notice USN-3548-1

Ubuntu Security Notice USN-3548-1
Posted Jan 26, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3548-1 - Jay Vosburgh discovered a logic error in the x86-64 syscall entry implementation in the Linux kernel, introduced as part of the mitigations for the Spectre vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, x86, kernel, local
systems | linux, ubuntu
SHA-256 | fd6620cdf4dbb2cacfee77be628eed34cca4832975ddbbfbc7643bbb36829c21

Ubuntu Security Notice USN-3548-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3548-1
January 26, 2018

linux vulnerability
==========================================================================

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

- Ubuntu 17.10

Summary:

The system could be made to crash or run programs as an administrator.

Software Description:
- linux: Linux kernel

Details:

Jay Vosburgh discovered a logic error in the x86-64 syscall entry
implementation in the Linux kernel, introduced as part of the
mitigations for the Spectre vulnerability. A local attacker could use
this to cause a denial of service or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 17.10:
linux-image-4.13.0-32-generic 4.13.0-32.35
linux-image-4.13.0-32-lowlatency 4.13.0-32.35
linux-image-generic 4.13.0.32.34
linux-image-lowlatency 4.13.0.32.34

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://www.ubuntu.com/usn/usn-3548-1
https://launchpad.net/bugs/1745564

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.13.0-32.35

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