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Ubuntu Security Notice USN-5977-1

Ubuntu Security Notice USN-5977-1
Posted Mar 28, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5977-1 - It was discovered that the network queuing discipline implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. 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.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2022-2196, CVE-2023-1032, CVE-2023-1281
SHA-256 | 99af519443a922498b72c03944c7ecee25171c7b6bce683a3cee5430e6cbb4b7

Ubuntu Security Notice USN-5977-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5977-1
March 27, 2023

linux-oem-6.0 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-oem-6.0: Linux kernel for OEM systems

Details:

It was discovered that the network queuing discipline implementation in the
Linux kernel contained 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-2023-1281)

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)

Thadeu Cascardo discovered that the io_uring subsystem contained a double-
free vulnerability in certain memory allocation error conditions. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2023-1032)

Update instructions:

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

Ubuntu 22.04 LTS:
linux-image-6.0.0-1013-oem 6.0.0-1013.13
linux-image-oem-22.04b 6.0.0.1013.13

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-5977-1
CVE-2022-2196, CVE-2023-1032, CVE-2023-1281

Package Information:
https://launchpad.net/ubuntu/+source/linux-oem-6.0/6.0.0-1013.13
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