==========================================================================
Ubuntu Security Notice USN-5979-1
March 28, 2023

linux-hwe-5.19 vulnerabilities
==========================================================================

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

- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-hwe-5.19: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the KVM VMX implementation in the Linux kernel did
not properly handle indirect branch prediction isolation between L1 and L2
VMs. An attacker in a guest VM could use this to expose sensitive
information from the host OS or other guest VMs. (CVE-2022-2196)

It was discovered that a race condition existed in the Xen network backend
driver in the Linux kernel when handling dropped packets in certain
circumstances. An attacker could use this to cause a denial of service
(kernel deadlock). (CVE-2022-42328, CVE-2022-42329)

Gerald Lee discovered that the USB Gadget file system implementation in the
Linux kernel contained a race condition, leading to a use-after-free
vulnerability in some situations. A local attacker could use this to cause
a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2022-4382)

José Oliveira and Rodrigo Branco discovered that the prctl syscall
implementation in the Linux kernel did not properly protect against
indirect branch prediction attacks in some situations. A local attacker
could possibly use this to expose sensitive information. (CVE-2023-0045)

It was discovered that a use-after-free vulnerability existed in the
Advanced Linux Sound Architecture (ALSA) subsystem. A local attacker could
use this to cause a denial of service (system crash). (CVE-2023-0266)

It was discovered that the io_uring subsystem in the Linux kernel contained
a use-after-free vulnerability. A local attacker could possibly use this to
cause a denial of service (system crash) or execute arbitrary code.
(CVE-2023-0469)

It was discovered that the CIFS network file system implementation in the
Linux kernel contained a user-after-free vulnerability. A local attacker
could possibly use this to cause a denial of service (system crash) or
execute arbitrary code. (CVE-2023-1195)

It was discovered that the RNDIS USB driver in the Linux kernel contained
an integer overflow vulnerability. A local attacker with physical access
could plug in a malicious USB device to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2023-23559)

Update instructions:

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

Ubuntu 22.04 LTS:
   linux-image-5.19.0-38-generic   5.19.0-38.39~22.04.1
   linux-image-5.19.0-38-generic-64k  5.19.0-38.39~22.04.1
   linux-image-5.19.0-38-generic-lpae  5.19.0-38.39~22.04.1
   linux-image-generic-64k-hwe-22.04  5.19.0.38.39~22.04.12
   linux-image-generic-hwe-22.04   5.19.0.38.39~22.04.12
   linux-image-generic-lpae-hwe-22.04  5.19.0.38.39~22.04.12
   linux-image-virtual-hwe-22.04   5.19.0.38.39~22.04.12

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-5979-1
   CVE-2022-2196, CVE-2022-42328, CVE-2022-42329, CVE-2022-4382,
   CVE-2023-0045, CVE-2023-0266, CVE-2023-0469, CVE-2023-1195,
   CVE-2023-23559

Package Information:
   https://launchpad.net/ubuntu/+source/linux-hwe-5.19/5.19.0-38.39~22.04.1