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Ubuntu 16.04 LTS USN-6739-1 Critical: Linux Kernel Security Issues

ubuntu
Calendar Grey April 19, 2024
Scroller Ubuntu
The Ubuntu Linux kernel contains significant vulnerabilities that necessitate prompt updates, as they pose risks of denial-of-service (DoS) attacks and potential data exposure.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed 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

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

Details:

It was discovered that a race condition existed in the instruction emulator

of the Linux kernel on Arm 64-bit systems. A local attacker could use this

to cause a denial of service (system crash). (CVE-2022-20422)

Wei Chen discovered that a race condition existed in the TIPC protocol

implementation in the Linux kernel, leading to a null pointer dereference

vulnerability. A local attacker could use this to cause a denial of service

(system crash). (CVE-2023-1382)

Jose Oliveira and Rodrigo Branco discovered that the Spectre Variant 2

mitigations with prctl syscall were insufficient in some situations. A

local attacker could possibly use this to expose sensitive info...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory DoS Ubuntu system crash Linux kernel authentication flaw insufficient mitigation

Update Instructions

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

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1131-kvm      4.4.0-1131.141
   linux-image-4.4.0-1168-aws      4.4.0-1168.183
   linux-image-4.4.0-253-generic   4.4.0-253.287
   linux-image-4.4.0-253-lowlatency  4.4.0-253.287
   linux-image-aws                 4.4.0.1168.172
   linux-image-generic             4.4.0.253.259
   linux-image-generic-lts-xenial  4.4.0.253.259
   linux-image-kvm                 4.4.0.1131.128
   linux-image-lowlatency          4.4.0.253.259
   linux-image-lowlatency-lts-xenial  4.4.0.253.259
   linux-image-virtual             4.4.0.253.259
   linux-image-virtual-lts-xenial  4.4.0.253.259

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1130-aws      4.4.0-1130.136
   linux-image-4.4.0-253-generic   4.4.0-253.287~14.04.1
   linux-image-4.4.0-253-lowlatency  4.4.0-253.287~14.04.1
   linux-image-aws                 4.4.0.1130.127
   linux-image-generic-lts-xenial  4.4.0.253.287~14.04.1
   linux-image-lowlatency-lts-xenial  4.4.0.253.287~14.04.1
   linux-image-virtual-lts-xenial  4.4.0.253.287~14.04.1

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-6739-1

CVE-2019-25162, CVE-2021-46936, CVE-2021-46955, CVE-2021-46966,

CVE-2021-46990, CVE-2022-20422, CVE-2023-1382, CVE-2023-1998,

CVE-2023-24023, CVE-2023-51043, CVE-2023-51779, CVE-2023-52429,

CVE-2023-52445, CVE-2023-52451, CVE-2023-52600, CVE-2023-52603,

CVE-2024-23851

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6739-1

Topics%20covered

Topics Covered

security advisory DoS Ubuntu system crash Linux kernel authentication flaw insufficient mitigation

Package Information

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