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Ubuntu 18.04: USN-3871-1 Critical Kernel Issues and Fixes

ubuntu
Calendar Grey January 29, 2019
Dist Ubuntu Esm H88
=========================================================================Ubuntu Security Notice USN-
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

Details:

Wen Xu discovered that a use-after-free vulnerability existed in the ext4

filesystem implementation in the Linux kernel. An attacker could use this

to construct a malicious ext4 image that, when mounted, could cause a

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

(CVE-2018-10876, CVE-2018-10879)

Wen Xu discovered that a buffer overflow existed in the ext4 filesystem

implementation in the Linux kernel. An attacker could use this to construct

a malicious ext4 image that, when mounted, could cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2018-10877)

Wen Xu discovered that an out-of-bounds write vulnerability existed in the

ext4 filesystem implementation in the Linux kernel. An attacker could use

this to construct a malicious ext4 image that, when mounted, could cause a

denial of service (system crash) or possibly ex...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow Ubuntu system crash linux kernel use-after-free

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-44-generic   4.15.0-44.47
  linux-image-4.15.0-44-generic-lpae  4.15.0-44.47
  linux-image-4.15.0-44-lowlatency  4.15.0-44.47
  linux-image-4.15.0-44-snapdragon  4.15.0-44.47
  linux-image-generic             4.15.0.44.46
  linux-image-generic-lpae        4.15.0.44.46
  linux-image-lowlatency          4.15.0.44.46
  linux-image-snapdragon          4.15.0.44.46

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://ubuntu.com/security/notices/USN-3871-1

CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879,

CVE-2018-10880, CVE-2018-10882, CVE-2018-10883, CVE-2018-14625,

CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407,

CVE-2018-9516

Severity
critical
Lowest
Low
Medium
High
Critical

January 29, 2019

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow Ubuntu system crash linux kernel use-after-free

Package Information

https://launchpad.net/ubuntu/+source/linux/4.15.0-44.47

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