[USN-6923-2] Linux kernel vulnerabilities

[Giampaolo Fresi Roglia]

==========================================================================
Ubuntu Security Notice USN-6923-2
July 30, 2024

linux-aws-5.15, linux-ibm, linux-ibm-5.15, linux-raspi vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-ibm: Linux kernel for IBM cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems
- linux-ibm-5.15: Linux kernel for IBM cloud systems

Details:

Benedict Schlüter, Supraja Sridhara, Andrin Bertschi, and Shweta Shinde
discovered that an untrusted hypervisor could inject malicious #VC
interrupts and compromise the security guarantees of AMD SEV-SNP. This flaw
is known as WeSee. A local attacker in control of the hypervisor could use
this to expose sensitive information or possibly execute arbitrary code in
the trusted execution environment. (CVE-2024-25742)

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
  - TTY drivers;
  - SMB network file system;
  - Netfilter;
  - Bluetooth subsystem;
(CVE-2024-26886, CVE-2023-52752, CVE-2024-36016, CVE-2024-26952,
CVE-2024-27017)

Update instructions:

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

Ubuntu 22.04 LTS
  linux-image-5.15.0-1059-ibm     5.15.0-1059.62
  linux-image-5.15.0-1059-raspi   5.15.0-1059.62
  linux-image-ibm                 5.15.0.1059.55
  linux-image-raspi               5.15.0.1059.57
  linux-image-raspi-nolpae        5.15.0.1059.57

Ubuntu 20.04 LTS
  linux-image-5.15.0-1059-ibm     5.15.0-1059.62~20.04.1
  linux-image-5.15.0-1066-aws     5.15.0-1066.72~20.04.1
  linux-image-aws                 5.15.0.1066.72~20.04.1
  linux-image-ibm                 5.15.0.1059.62~20.04.1

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-6923-2
  https://ubuntu.com/security/notices/USN-6923-1
  CVE-2023-52752, CVE-2024-25742, CVE-2024-26886, CVE-2024-26952,
  CVE-2024-27017, CVE-2024-36016

Package Information:
  https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1059.62
  https://launchpad.net/ubuntu/+source/linux-raspi/5.15.0-1059.62
  https://launchpad.net/ubuntu/+source/linux-aws-5.15/5.15.0-1066.72~20.04.1
  https://launchpad.net/ubuntu/+source/linux-ibm-5.15/5.15.0-1059.62~20.04.1
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