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Ubuntu 16.04, 14.04 LTS USN-6700-1 critical: Denial Of Service Issues

ubuntu
Calendar Grey March 19, 2024
Dist Ubuntu Esm H88
Important patches for Ubuntu address multiple kernel security flaws and risks. Safeguard your devices promptly.
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-kvm: Linux kernel for cloud environments

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

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

Details:

It was discovered that the Layer 2 Tunneling Protocol (L2TP) implementation

in the Linux kernel contained a race condition when releasing PPPoL2TP

sockets in certain conditions, leading to a use-after-free vulnerability.

A local attacker could use this to cause a denial of service (system crash)

or possibly execute arbitrary code. (CVE-2022-20567)

It was discovered that the ext4 file system implementation in the Linux

kernel did not properly handle block device modification while it is

mounted. A privileged attacker could use this to cause a denial of service

(system crash) or possibly expose sensitive information. (CVE-2023-34256)

Eric Dumazet discovered that th...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel system update ubuntu linux kernel use-after-free cloud environment

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-4.4.0-1130-kvm      4.4.0-1130.140
   linux-image-4.4.0-252-generic   4.4.0-252.286
   linux-image-4.4.0-252-lowlatency  4.4.0-252.286
   linux-image-generic             4.4.0.252.258
   linux-image-generic-lts-xenial  4.4.0.252.258
   linux-image-kvm                 4.4.0.1130.127
   linux-image-lowlatency          4.4.0.252.258
   linux-image-lowlatency-lts-xenial  4.4.0.252.258
   linux-image-virtual             4.4.0.252.258
   linux-image-virtual-lts-xenial  4.4.0.252.258

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1129-aws      4.4.0-1129.135
   linux-image-4.4.0-252-generic   4.4.0-252.286~14.04.1
   linux-image-4.4.0-252-lowlatency  4.4.0-252.286~14.04.1
   linux-image-aws                 4.4.0.1129.126
   linux-image-generic-lts-xenial  4.4.0.252.219
   linux-image-lowlatency-lts-xenial  4.4.0.252.219
   linux-image-virtual-lts-xenial  4.4.0.252.219

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-6700-1

CVE-2022-20567, CVE-2023-34256, CVE-2023-39197, CVE-2023-51781,

CVE-2024-0775, CVE-2024-1086, CVE-2024-24855

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6700-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel system update ubuntu linux kernel use-after-free cloud environment

Package Information

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