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Ubuntu 16.04 LTS USN-6254-1 Critical: Kernel Denial of Service Fix

ubuntu
Calendar Grey July 26, 2023
Dist Ubuntu Esm H88
Multiple critical security issues in the Linux kernel addressed. Immediate update recommended to safeguard systems.
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:

Jordy Zomer and Alexandra Sandulescu discovered that syscalls invoking the

do_prlimit() function in the Linux kernel did not properly handle

speculative execution barriers. A local attacker could use this to expose

sensitive information (kernel memory). (CVE-2023-0458)

It was discovered that a race condition existed in the btrfs file system

implementation in the Linux kernel, leading to a use-after-free

vulnerability. A local attacker could use this to cause a denial of service

(system crash) or possibly expose sensitive information. (CVE-2023-1611)

It was discovered that the XFS file system implementation in the Linux

kernel did not properly perform metadata val...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu linux memory exposure

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-4.4.0-1122-kvm      4.4.0-1122.132
   linux-image-4.4.0-1159-aws      4.4.0-1159.174
   linux-image-4.4.0-243-generic   4.4.0-243.277
   linux-image-4.4.0-243-lowlatency  4.4.0-243.277
   linux-image-aws                 4.4.0.1159.163
   linux-image-generic             4.4.0.243.249
   linux-image-generic-lts-xenial  4.4.0.243.249
   linux-image-kvm                 4.4.0.1122.119
   linux-image-lowlatency          4.4.0.243.249
   linux-image-lowlatency-lts-xenial  4.4.0.243.249
   linux-image-virtual             4.4.0.243.249
   linux-image-virtual-lts-xenial  4.4.0.243.249

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1121-aws      4.4.0-1121.127
   linux-image-4.4.0-243-generic   4.4.0-243.277~14.04.1
   linux-image-4.4.0-243-lowlatency  4.4.0-243.277~14.04.1
   linux-image-aws                 4.4.0.1121.118
   linux-image-generic-lts-xenial  4.4.0.243.211
   linux-image-lowlatency-lts-xenial  4.4.0.243.211
   linux-image-virtual-lts-xenial  4.4.0.243.211

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-6254-1

CVE-2023-0458, CVE-2023-1611, CVE-2023-2124, CVE-2023-2162,

CVE-2023-2513, CVE-2023-3090, CVE-2023-3141, CVE-2023-3159,

CVE-2023-3161, CVE-2023-3268, CVE-2023-3390, CVE-2023-35001

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6254-1

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu linux memory exposure

Package Information

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