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Ubuntu 16.04, 14.04 USN-5650-1 Critical: Linux Kernel Security Flaws

ubuntu
Calendar Grey September 30, 2022
Dist Ubuntu Esm H88
Several vulnerabilities in the Ubuntu Linux kernel necessitate immediate patches to avert potential denial of service and unauthorized code execution.
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 the framebuffer driver on the Linux kernel did not

verify size limits when changing font or screen size, leading to an out-of-bounds write. A local attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2021-33655)

It was discovered that the virtual terminal driver in the Linux kernel did

not properly handle VGA console font changes, leading to an out-of-bounds

write. A local attacker could use this to cause a denial of service (system

crash) or possibly execute arbitrary code. (CVE-2021-33656)

Christian Brauner discovered that the XFS file system implementation in the

Linux kernel did no...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical privilege escalation ubuntu linux kernel linux-aws

Update Instructions

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

Ubuntu 16.04 ESM:
   linux-image-4.4.0-1114-kvm      4.4.0-1114.124
   linux-image-4.4.0-1151-aws      4.4.0-1151.166
   linux-image-4.4.0-234-generic   4.4.0-234.268
   linux-image-4.4.0-234-lowlatency  4.4.0-234.268
   linux-image-aws                 4.4.0.1151.155
   linux-image-generic             4.4.0.234.240
   linux-image-kvm                 4.4.0.1114.111
   linux-image-lowlatency          4.4.0.234.240
   linux-image-virtual             4.4.0.234.240

Ubuntu 14.04 ESM:
   linux-image-4.4.0-1113-aws      4.4.0-1113.119
   linux-image-4.4.0-234-generic   4.4.0-234.268~14.04.1
   linux-image-4.4.0-234-lowlatency  4.4.0-234.268~14.04.1
   linux-image-aws                 4.4.0.1113.110
   linux-image-generic-lts-xenial  4.4.0.234.203
   linux-image-lowlatency-lts-xenial  4.4.0.234.203
   linux-image-virtual-lts-xenial  4.4.0.234.203

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-5650-1

CVE-2021-33655, CVE-2021-33656, CVE-2021-4037, CVE-2022-0850,

CVE-2022-1199, CVE-2022-1204, CVE-2022-1729, CVE-2022-20368,

CVE-2022-2639, CVE-2022-2964, CVE-2022-2978, CVE-2022-3028,

CVE-2022-3202, CVE-2022-36946

Severity
critical
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Critical

September 30, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical privilege escalation ubuntu linux kernel linux-aws

Package Information

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