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Ubuntu 20.04 LTS USN-6330-1 Critical: Kernel GCP Exploits and Fixes

ubuntu
Calendar Grey September 1, 2023
Dist Ubuntu Esm H88
Patches for Ubuntu 20.04 LTS resolve significant security flaws in the Linux kernel for Amazon Web Services environments.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gcp-5.15: Linux kernel for Google Cloud Platform (GCP) systems

Details:

Daniel Moghimi discovered that some Intel(R) Processors did not properly

clear microarchitectural state after speculative execution of various

instructions. A local unprivileged user could use this to obtain to

sensitive information. (CVE-2022-40982)

Tavis Ormandy discovered that some AMD processors did not properly handle

speculative execution of certain vector register instructions. A local

attacker could use this to expose sensitive information. (CVE-2023-20593)

Ye Zhang and Nicolas Wu discovered that the io_uring subsystem in the Linux

kernel did not properly handle locking for rings with IOPOLL, leading to a

double-free vulnerability. A local attacker could use this to cause a

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

(CVE-2023-21400)

It was discovered that the unive...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu information exposure Linux kernel out-of-bounds GCP

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1040-gcp     5.15.0-1040.48~20.04.1
   linux-image-gcp                 5.15.0.1040.48~20.04.1

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-6330-1

CVE-2022-40982, CVE-2023-20593, CVE-2023-21400, CVE-2023-3609,

CVE-2023-3610, CVE-2023-3611, CVE-2023-3776, CVE-2023-3777,

CVE-2023-3995, CVE-2023-4004, CVE-2023-4015

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6330-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu information exposure Linux kernel out-of-bounds GCP

Package Information

https://launchpad.net/ubuntu/+source/linux-gcp-5.15/5.15.0-1040.48~20.04.1

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