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Ubuntu Security Notice USN-6648-2

Ubuntu Security Notice USN-6648-2
Posted Feb 29, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6648-2 - It was discovered that a race condition existed in the AppleTalk networking subsystem of the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Zhenghan Wang discovered that the generic ID allocator implementation in the Linux kernel did not properly check for null bitmap when releasing IDs. A local attacker could use this to cause a denial of service.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-51781, CVE-2023-6915, CVE-2024-0565, CVE-2024-0646
SHA-256 | b20b61a904133f077965c2d159bb4588f6d1a76c9d9e29a8c1d6e8e4f12b7705

Ubuntu Security Notice USN-6648-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-6648-2
February 28, 2024

linux-azure, linux-azure-5.4 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems

Details:

It was discovered that a race condition existed in the AppleTalk networking
subsystem of the Linux kernel, leading to 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-2023-51781)

Zhenghan Wang discovered that the generic ID allocator implementation in
the Linux kernel did not properly check for null bitmap when releasing IDs.
A local attacker could use this to cause a denial of service (system
crash). (CVE-2023-6915)

Robert Morris discovered that the CIFS network file system implementation
in the Linux kernel did not properly validate certain server commands
fields, leading to an out-of-bounds read vulnerability. An attacker could
use this to cause a denial of service (system crash) or possibly expose
sensitive information. (CVE-2024-0565)

Jann Horn discovered that the TLS subsystem in the Linux kernel did not
properly handle spliced messages, leading to an out-of-bounds write
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2024-0646)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.4.0-1124-azure 5.4.0-1124.131
linux-image-azure-lts-20.04 5.4.0.1124.117

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
linux-image-5.4.0-1124-azure 5.4.0-1124.131~18.04.1
linux-image-azure 5.4.0.1124.97

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-6648-2
https://ubuntu.com/security/notices/USN-6648-1
CVE-2023-51781, CVE-2023-6915, CVE-2024-0565, CVE-2024-0646

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1124.131

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