A Linux kernel security update has been released for Ubuntu Linux 14.04 ESM, 16.04 ESM, 18.04 LTS, 20.04 LTS, and 22.04 LTS.

[LSN-0097-1] Linux kernel vulnerability

Linux kernel vulnerabilities

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 22.04 LTS
- Ubuntu 14.04 ESM

Summary

Several security issues were fixed in the kernel.

Software Description

- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems
- linux-azure - Linux kernel for Microsoft Azure Cloud systems
- linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke - Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop - Linux kernel for Google Container Engine (GKE) systems
- linux-ibm - Linux kernel for IBM cloud systems

Details

It was discovered that the IP-VLAN network driver for the Linux kernel
did not properly initialize memory in some situations, leading to an
out-of- bounds write vulnerability. An attacker could use this to cause
a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2023-3090)

Querijn Voet discovered that a race condition existed in the io_uring
subsystem in 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-2023-3389)

It was discovered that the netfilter subsystem in the Linux kernel did
not properly handle some error conditions, 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-2023-3390)

Mingi Cho discovered that the netfilter subsystem in the Linux kernel
did not properly validate the status of a nft chain while performing a
lookup by id, leading to a use-after-free vulnerability. An attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2023-31248)

Shir Tamari and Sagi Tzadik discovered that the OverlayFS implementation
in the Ubuntu Linux kernel did not properly perform permission checks in
certain situations. A local attacker could possibly use this to gain
elevated privileges. (CVE-2023-32629)

Tanguy Dubroca discovered that the netfilter subsystem in the Linux
kernel did not properly handle certain pointer data type, leading to an
out-of- bounds write vulnerability. A privileged attacker could use this
to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2023-35001)

Hangyu Hua discovered that the Flower classifier implementation in the
Linux kernel contained an out-of-bounds write vulnerability. An attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2023-35788)

Update instructions

The problem can be corrected by updating your kernel livepatch to the
following versions:

Ubuntu 20.04 LTS
aws - 97.1
azure - 97.1
gcp - 97.1
generic - 97.1
gke - 97.1
gkeop - 97.1
ibm - 97.1
lowlatency - 97.1

Ubuntu 18.04 LTS
aws - 97.1
azure - 97.1
gcp - 97.1
generic - 97.1
gke - 97.1
gkeop - 97.1
ibm - 97.1
lowlatency - 97.1

Ubuntu 16.04 ESM
aws - 97.2
generic - 97.2
lowlatency - 97.2

Ubuntu 22.04 LTS
aws - 97.2
azure - 97.1
gcp - 97.1
generic - 97.1
gke - 97.1
ibm - 97.1

Ubuntu 14.04 ESM
generic - 97.2
lowlatency - 97.2

Support Information

Livepatches for supported LTS kernels will receive upgrades for a period
of up to 13 months after the build date of the kernel.

Livepatches for supported HWE kernels which are not based on an LTS
kernel version will receive upgrades for a period of up to 9 months
after the build date of the kernel, or until the end of support for that
kernel’s non-LTS distro release version, whichever is sooner.

References

- CVE-2023-3090
- CVE-2023-3389
- CVE-2023-3390
- CVE-2023-31248
- CVE-2023-32629
- CVE-2023-35001
- CVE-2023-35788