[USN-6921-2] Linux kernel vulnerabilities

[Giampaolo Fresi Roglia]

==========================================================================
Ubuntu Security Notice USN-6921-2
July 30, 2024

linux-lowlatency vulnerabilities
==========================================================================

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

- Ubuntu 24.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-lowlatency: Linux low latency kernel

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:
  - DMA engine subsystem;
  - HID subsystem;
  - I2C subsystem;
  - PHY drivers;
  - TTY drivers;
  - IPv4 networking;
(CVE-2024-35997, CVE-2024-36016, CVE-2024-35990, CVE-2024-35984,
CVE-2024-35992, CVE-2024-36008)

Update instructions:

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

Ubuntu 24.04 LTS
  linux-image-6.8.0-39-lowlatency  6.8.0-39.39.1
  linux-image-6.8.0-39-lowlatency-64k  6.8.0-39.39.1
  linux-image-lowlatency          6.8.0-39.39.1
  linux-image-lowlatency-64k      6.8.0-39.39.1

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-6921-2
  https://ubuntu.com/security/notices/USN-6921-1
  CVE-2024-25742, CVE-2024-35984, CVE-2024-35990, CVE-2024-35992,
  CVE-2024-35997, CVE-2024-36008, CVE-2024-36016

Package Information:
  https://launchpad.net/ubuntu/+source/linux-lowlatency/6.8.0-39.39.1
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