==========================================================================
Ubuntu Security Notice USN-6040-1
April 25, 2023

linux-hwe-5.15 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the Traffic-Control Index (TCINDEX) 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 OverlayFS implementation in the Linux kernel did
not properly handle copy up operation in some conditions. A local attacker
could possibly use this to gain elevated privileges. (CVE-2023-0386)

Haowei Yan discovered that a race condition existed in the Layer 2
Tunneling Protocol (L2TP) implementation in the Linux kernel. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2022-4129)

It was discovered that the network queuing discipline implementation in the
Linux kernel contained a null pointer dereference in some situations. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2022-47929)

It was discovered that the NTFS file system implementation in the Linux
kernel contained a null pointer dereference in some situations. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2022-4842)

Kyle Zeng discovered that the IPv6 implementation in the Linux kernel
contained a NULL pointer dereference vulnerability in certain situations. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2023-0394)

It was discovered that the Human Interface Device (HID) support driver in
the Linux kernel contained a type confusion vulnerability in some
situations. A local attacker could use this to cause a denial of service
(system crash). (CVE-2023-1073)

It was discovered that a memory leak existed in the SCTP protocol
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (memory exhaustion). (CVE-2023-1074)

It was discovered that the NFS implementation in the Linux kernel did not
properly handle pending tasks in some situations. A local attacker could
use this to cause a denial of service (system crash) or expose sensitive
information (kernel memory). (CVE-2023-1652)

Lianhui Tang discovered that the MPLS implementation in the Linux kernel
did not properly handle certain sysctl allocation failure conditions,
leading to a double-free vulnerability. An attacker could use this to cause
a denial of service or possibly execute arbitrary code. (CVE-2023-26545)

Update instructions:

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

Ubuntu 20.04 LTS:
   linux-image-5.15.0-70-generic   5.15.0-70.77~20.04.1
   linux-image-5.15.0-70-generic-64k  5.15.0-70.77~20.04.1
   linux-image-5.15.0-70-generic-lpae  5.15.0-70.77~20.04.1
   linux-image-generic-64k-hwe-20.04  5.15.0.70.77~20.04.31
   linux-image-generic-hwe-20.04   5.15.0.70.77~20.04.31
   linux-image-generic-lpae-hwe-20.04  5.15.0.70.77~20.04.31
   linux-image-oem-20.04           5.15.0.70.77~20.04.31
   linux-image-oem-20.04b          5.15.0.70.77~20.04.31
   linux-image-oem-20.04c          5.15.0.70.77~20.04.31
   linux-image-oem-20.04d          5.15.0.70.77~20.04.31
   linux-image-virtual-hwe-20.04   5.15.0.70.77~20.04.31

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-6040-1
   CVE-2022-4129, CVE-2022-47929, CVE-2022-4842, CVE-2023-0386,
   CVE-2023-0394, CVE-2023-1073, CVE-2023-1074, CVE-2023-1281,
   CVE-2023-1652, CVE-2023-26545

Package Information:
   https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-70.77~20.04.1