Ubuntu 18.04 LTS USN-5984-1 Critical: Denial Of Service Threats

ubuntu

March 29, 2023

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-dell300x: Linux kernel for Dell 300x platforms

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi2: Linux kernel for Raspberry Pi systems

Details:

It was discovered that the System V IPC implementation in the Linux kernel

did not properly handle large shared memory counts. A local attacker could

use this to cause a denial of service (memory exhaustion). (CVE-2021-3669)

It was discovered that a use-after-free vulnerability existed in the SGI

GRU driver in the Linux kernel. A local attacker could possibly use this to

cause a denial of service (system crash) or possibly execute arbitrary

code. (CVE-2022-3424)

Ziming Zhang discovered that the VMware Virtual GPU DRM driver in the Linux

kernel contained an out-of-bounds write ...

Read the Full Advisory

Topics Covered

security advisory denial of service critical Ubuntu kernel memory exhaustion system crash

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1062-dell300x  4.15.0-1062.67
   linux-image-4.15.0-1116-oracle  4.15.0-1116.127
   linux-image-4.15.0-1129-raspi2  4.15.0-1129.137
   linux-image-4.15.0-1137-kvm     4.15.0-1137.142
   linux-image-4.15.0-1153-aws     4.15.0-1153.166
   linux-image-4.15.0-208-generic  4.15.0-208.220
   linux-image-4.15.0-208-generic-lpae  4.15.0-208.220
   linux-image-4.15.0-208-lowlatency  4.15.0-208.220
   linux-image-aws-lts-18.04       4.15.0.1153.151
   linux-image-dell300x            4.15.0.1062.61
   linux-image-generic             4.15.0.208.191
   linux-image-generic-lpae        4.15.0.208.191
   linux-image-kvm                 4.15.0.1137.128
   linux-image-lowlatency          4.15.0.208.191
   linux-image-oracle-lts-18.04    4.15.0.1116.121
   linux-image-raspi2              4.15.0.1129.124
   linux-image-virtual             4.15.0.208.191

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.