USN-3880-1: Linux kernel vulnerabilities
linux vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
- linux – Linux kernel
Details
It was discovered that the CIFS client implementation in the Linux kernel
did not properly handle setup negotiation during session recovery, leading
to a NULL pointer exception. An attacker could use this to create a
malicious CIFS server that caused a denial of service (client system
crash). (CVE-2018-1066)
Jann Horn discovered that the procfs file system implementation in the
Linux kernel did not properly restrict the ability to inspect the kernel
stack of an arbitrary task. A local attacker could use this to expose
sensitive information. (CVE-2018-17972)
Jann Horn discovered that the mremap() system call in the Linux kernel did
not properly flush the TLB when completing, potentially leaving access to a
physical page after it has been released to the page allocator. A local
attacker could use this to cause a denial of service (system crash), expose
sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)
It was discovered that the socket implementation in the Linux kernel
contained a type confusion error that could lead to memory corruption. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2018-9568)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 14.04 LTS
- linux-image-3.13.0-165-generic – 3.13.0-165.215
- linux-image-3.13.0-165-generic-lpae – 3.13.0-165.215
- linux-image-3.13.0-165-lowlatency – 3.13.0-165.215
- linux-image-3.13.0-165-powerpc-e500 – 3.13.0-165.215
- linux-image-3.13.0-165-powerpc-e500mc – 3.13.0-165.215
- linux-image-3.13.0-165-powerpc-smp – 3.13.0-165.215
- linux-image-3.13.0-165-powerpc64-emb – 3.13.0-165.215
- linux-image-3.13.0-165-powerpc64-smp – 3.13.0-165.215
- linux-image-generic – 3.13.0.165.175
- linux-image-generic-lpae – 3.13.0.165.175
- linux-image-lowlatency – 3.13.0.165.175
- linux-image-powerpc-e500 – 3.13.0.165.175
- linux-image-powerpc-e500mc – 3.13.0.165.175
- linux-image-powerpc-smp – 3.13.0.165.175
- linux-image-powerpc64-emb – 3.13.0.165.175
- linux-image-powerpc64-smp – 3.13.0.165.175
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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
Source: USN-3880-1: Linux kernel vulnerabilities
