Alerts This Week
Warning Icon 1 758
Alerts This Week
Warning Icon 1 758

Ubuntu 20.04: USN-6416-2 Critical: Denial Of Service Risks Addressed

ubuntu
Calendar Grey October 6, 2023
Dist Ubuntu Esm H88
Essential updates released for Ubuntu 20.04 LTS resolving vulnerabilities related to potential service interruptions and data leaks.
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-oracle-5.15: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the IPv6 implementation in the Linux kernel

contained a high rate of hash collisions in connection lookup table. A

remote attacker could use this to cause a denial of service (excessive CPU

consumption). (CVE-2023-1206)

Daniël Trujillo, Johannes Wikner, and Kaveh Razavi discovered that some AMD

processors utilising speculative execution and branch prediction may allow

unauthorised memory reads via a speculative side-channel attack. A local

attacker could use this to expose sensitive information, including kernel

memory. (CVE-2023-20569)

It was discovered that the IPv6 RPL protocol implementation in the Linux

kernel did not properly handle user-supplied data. A remote attacker could

use this to cause a denial of service (system crash...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update ubuntu information leakage

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1045-oracle  5.15.0-1045.51~20.04.1
   linux-image-5.15.0-86-generic   5.15.0-86.96~20.04.1
   linux-image-5.15.0-86-generic-64k  5.15.0-86.96~20.04.1
   linux-image-5.15.0-86-generic-lpae  5.15.0-86.96~20.04.1
   linux-image-generic-64k-hwe-20.04  5.15.0.86.96~20.04.44
   linux-image-generic-hwe-20.04   5.15.0.86.96~20.04.44
   linux-image-generic-lpae-hwe-20.04  5.15.0.86.96~20.04.44
   linux-image-oem-20.04           5.15.0.86.96~20.04.44
   linux-image-oem-20.04b          5.15.0.86.96~20.04.44
   linux-image-oem-20.04c          5.15.0.86.96~20.04.44
   linux-image-oem-20.04d          5.15.0.86.96~20.04.44
   linux-image-oracle              5.15.0.1045.51~20.04.1
   linux-image-virtual-hwe-20.04   5.15.0.86.96~20.04.44

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-6416-2

https://ubuntu.com/security/notices/USN-6416-1

CVE-2023-1206, CVE-2023-20569, CVE-2023-2156, CVE-2023-3338,

CVE-2023-38432, CVE-2023-3863, CVE-2023-3865, CVE-2023-3866,

CVE-2023-4132, CVE-2023-4155, CVE-2023-4194, CVE-2023-4273,

CVE-2023-44466

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6416-2

Topics%20covered

Topics Covered

security advisory denial of service kernel update ubuntu information leakage

Package Information

https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-86.96~20.04.1
https://launchpad.net/ubuntu/+source/linux-oracle-5.15/5.15.0-1045.51~20.04.1

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here