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Alerts This Week
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Ubuntu 18.04: USN-5728-3 Critical Issues: Kernel Denial Of Service

ubuntu
Calendar Grey November 29, 2022
Dist Ubuntu Esm H88
Recent Ubuntu Security Alert USN-5729-4 tackles vital kernel vulnerabilities impacting AWS deployments, safeguarding overall system security.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems

Details:

Jann Horn discovered that the Linux kernel did not properly track memory

allocations for anonymous VMA mappings in some situations, leading to

potential data structure reuse. A local attacker could use this to cause a

denial of service (system crash) or possibly execute arbitrary code.

(CVE-2022-42703)

It was discovered that a race condition existed in the memory address space

accounting 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 execute arbitrary code. (CVE-2022-41222)

It was discovered that a race condition existed in the instruction emulator

of the Linux kernel on Arm 64-bit systems. A local attacker could use this

to cause a denial of service (system crash). (CVE-2022-20422)

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu use after free linux-gcp

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-5.4.0-1093-gcp      5.4.0-1093.102~18.04.1
   linux-image-gcp                 5.4.0.1093.71

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-5728-3

https://ubuntu.com/security/notices/USN-5728-1

CVE-2022-20422, CVE-2022-2153, CVE-2022-2978, CVE-2022-29901,

CVE-2022-3028, CVE-2022-3625, CVE-2022-3635, CVE-2022-39188,

CVE-2022-40768, CVE-2022-41222, CVE-2022-42703, CVE-2022-42719

Severity
critical
Lowest
Low
Medium
High
Critical

November 29, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu use after free linux-gcp

Package Information

https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1093.102~18.04.1

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