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Ubuntu 20.04 LTS: USN-5623-1 Critical Denial of Service Flaws

ubuntu
Calendar Grey September 21, 2022
Dist Ubuntu Esm H88
Multiple vulnerabilities addressed in Ubuntu's Linux kernel improved overall performance and security, prompting immediate patch releases.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-hwe-5.15: Linux hardware enablement (HWE) kernel

- linux-lowlatency-hwe-5.15: Linux low latency kernel

Details:

Asaf Modelevsky discovered that the Intel(R) 10GbE PCI Express (ixgbe)

Ethernet driver for the Linux kernel performed insufficient control flow

management. A local attacker could possibly use this to cause a denial of

service. (CVE-2021-33061)

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)

Moshe Kol, Amit Klein and Yossi Gilad discovered that the IP implementation

in the Linux kernel did not provide sufficient randomization when

calculating port offsets. An attacker could possibly use this to expose

sensitive information....

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service update critical kernel ubuntu linux

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.15.0-48-generic   5.15.0-48.54~20.04.1
  linux-image-5.15.0-48-generic-64k  5.15.0-48.54~20.04.1
  linux-image-5.15.0-48-generic-lpae  5.15.0-48.54~20.04.1
  linux-image-5.15.0-48-lowlatency  5.15.0-48.54~20.04.1
  linux-image-5.15.0-48-lowlatency-64k  5.15.0-48.54~20.04.1
  linux-image-generic-64k-hwe-20.04  5.15.0.48.54~20.04.18
  linux-image-generic-hwe-20.04   5.15.0.48.54~20.04.18
  linux-image-generic-lpae-hwe-20.04  5.15.0.48.54~20.04.18
  linux-image-lowlatency-64k-hwe-20.04  5.15.0.48.54~20.04.16
  linux-image-lowlatency-hwe-20.04  5.15.0.48.54~20.04.16
  linux-image-virtual-hwe-20.04   5.15.0.48.54~20.04.18

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-5623-1

CVE-2021-33061, CVE-2021-33655, CVE-2022-1012, CVE-2022-1729,

CVE-2022-1852, CVE-2022-1943, CVE-2022-1973, CVE-2022-2318,

CVE-2022-2503, CVE-2022-26365, CVE-2022-2873, CVE-2022-2959,

CVE-2022-32296, CVE-2022-33740, CVE-2022-33741, CVE-2022-33742,

CVE-2022-33743, CVE-2022-33744, CVE-2022-34494, CVE-2022-34495,

CVE-2022-36946

Severity
critical
Lowest
Low
Medium
High
Critical

September 21, 2022

Topics%20covered

Topics Covered

security advisory denial of service update critical kernel ubuntu linux

Package Information

https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-48.54~20.04.1
https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-5.15/5.15.0-48.54~20.04.1

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