==========================================================================
Ubuntu Security Notice USN-6651-2
February 28, 2024

linux-lowlatency, linux-lowlatency-hwe-6.5, linux-oem-6.5 vulnerabilities
==========================================================================

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

- Ubuntu 23.10
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-lowlatency: Linux low latency kernel
- linux-lowlatency-hwe-6.5: Linux low latency kernel
- linux-oem-6.5: Linux kernel for OEM systems

Details:

It was discovered that a race condition existed in the ATM (Asynchronous
Transfer Mode) 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-2023-51780)

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 io_uring subsystem in the Linux kernel did
not properly handle the release of certain buffer rings. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2024-0582)

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 23.10:
   linux-image-6.5.0-21-lowlatency  6.5.0-21.21.1
   linux-image-6.5.0-21-lowlatency-64k  6.5.0-21.21.1
   linux-image-lowlatency          6.5.0.21.21.15
   linux-image-lowlatency-64k      6.5.0.21.21.15

Ubuntu 22.04 LTS:
   linux-image-6.5.0-1015-oem      6.5.0-1015.16
   linux-image-6.5.0-21-lowlatency  6.5.0-21.21.1~22.04.1
   linux-image-6.5.0-21-lowlatency-64k  6.5.0-21.21.1~22.04.1
   linux-image-lowlatency-64k-hwe-22.04  6.5.0.21.21.1~22.04.7
   linux-image-lowlatency-hwe-22.04  6.5.0.21.21.1~22.04.7
   linux-image-oem-22.04d          6.5.0.1015.17

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-6651-2
   https://ubuntu.com/security/notices/USN-6651-1
   CVE-2023-51780, CVE-2023-51781, CVE-2023-6915, CVE-2024-0565,
   CVE-2024-0582, CVE-2024-0646

Package Information:
   https://launchpad.net/ubuntu/+source/linux-lowlatency/6.5.0-21.21.1
 
https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-6.5/6.5.0-21.21.1~22.04.1
   https://launchpad.net/ubuntu/+source/linux-oem-6.5/6.5.0-1015.16