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Ubuntu 16.04: USN-6439-1 High Severity: Kernel DoS Issues

ubuntu
Calendar Grey October 20, 2023
Dist Ubuntu Esm H88
Important kernel patches released for Ubuntu users to fix various vulnerabilities and prevent possible system instability.
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 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 that the Xen netback backend driver in the Linux

kernel did not properly handle certain unusual packets from a

paravirtualized network f...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory Ubuntu kernel update instructions Denial of Service system crash

Update Instructions

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

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1125-kvm      4.4.0-1125.135
   linux-image-4.4.0-1162-aws      4.4.0-1162.177
   linux-image-4.4.0-246-generic   4.4.0-246.280
   linux-image-4.4.0-246-lowlatency  4.4.0-246.280
   linux-image-aws                 4.4.0.1162.166
   linux-image-generic             4.4.0.246.252
   linux-image-generic-lts-xenial  4.4.0.246.252
   linux-image-kvm                 4.4.0.1125.122
   linux-image-lowlatency          4.4.0.246.252
   linux-image-lowlatency-lts-xenial  4.4.0.246.252
   linux-image-virtual             4.4.0.246.252
   linux-image-virtual-lts-xenial  4.4.0.246.252

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-246-generic   4.4.0-246.280~14.04.1
   linux-image-4.4.0-246-lowlatency  4.4.0-246.280~14.04.1
   linux-image-generic-lts-xenial  4.4.0.246.214
   linux-image-lowlatency-lts-xenial  4.4.0.246.214
   linux-image-virtual-lts-xenial  4.4.0.246.214

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-6439-1

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

Ubuntu Security Notice USN-6439-1

Topics%20covered

Topics Covered

security advisory Ubuntu kernel update instructions Denial of Service system crash

Package Information

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