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Ubuntu 14.04 LTS USN-6440-2 Critical Denial of Service Threat

ubuntu
Calendar Grey October 20, 2023
Dist Ubuntu Esm H88
Ubuntu 14.04 LTS has received important updates that address severe kernel vulnerabilities tied to denial of service exploits within Azure environments.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

Details:

Seth Jenkins discovered that the Linux kernel did not properly perform

address randomization for a per-cpu memory management structure. A local

attacker could use this to expose sensitive information (kernel memory) or

in conjunction with another kernel vulnerability. (CVE-2023-0597)

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)

Yu Hao and Weiteng Chen discovered that the Bluetooth HCI UART driver in

the Linux kernel contained a race condition, leading to a null pointer

dereference vulnerability. A local attacker could use this to cause a

denial of service (system crash). (CVE-2023-31083)

Ross Lagerwall discovered...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical issue kernel patch ubuntu linux-azure

Update Instructions

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

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1171-azure   4.15.0-1171.186~14.04.1
   linux-image-azure               4.15.0.1171.137

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-6440-2

https://ubuntu.com/security/notices/USN-6440-1

CVE-2023-0597, CVE-2023-1206, CVE-2023-31083, CVE-2023-34319,

CVE-2023-3772, CVE-2023-42752, CVE-2023-42753, CVE-2023-42755,

CVE-2023-4622, CVE-2023-4623, CVE-2023-4881, CVE-2023-4921

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6440-2

Topics%20covered

Topics Covered

security advisory denial of service critical issue kernel patch ubuntu linux-azure

Package Information

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