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 Broadcom FullMAC USB WiFi driver in the Linux
kernel did not properly perform data buffer size validation in some
situations. A physically proximate attacker could use this to craft a
malicious USB device that when inserted, could cause a denial of service
(system crash) or possibly expose sensitive information. (CVE-2023-1380)

Reima Ishii discovered that the nested KVM implementation for Intel x86
processors in the Linux kernel did not properly validate control
registers in certain situations. An attacker in a guest VM could use
this to cause a denial of service (guest crash). (CVE-2023-30456)

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)

Gwangun Jung discovered that the Quick Fair Queueing scheduler
implementation in the Linux kernel contained 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-2023-31436)

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)

Update instructions

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

Ubuntu 20.04 LTS
    aws - 96.2
    azure - 96.2
    gcp - 96.2
    gcp - 96.3
    generic - 96.2
    generic - 96.3
    gke - 96.2
    gke - 96.3
    gkeop - 96.2
    ibm - 96.2
    lowlatency - 96.2
    lowlatency - 96.3

Ubuntu 18.04 LTS
    azure - 96.2
    gcp - 96.2
    generic - 96.2
    gke - 96.2
    gkeop - 96.2
    ibm - 96.2
    lowlatency - 96.2

Ubuntu 16.04 ESM
    aws - 96.2
    azure - 96.2
    gcp - 96.2
    generic - 96.2
    lowlatency - 96.2

Ubuntu 22.04 LTS
    azure - 96.2
    azure - 96.3
    gcp - 96.2
    gcp - 96.3
    generic - 96.2
    generic - 96.3
    gke - 96.2
    gke - 96.3
    ibm - 96.2
    ibm - 96.3

Ubuntu 14.04 ESM
    generic - 96.2
    lowlatency - 96.2

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-2023-1380
-   CVE-2023-30456
-   CVE-2023-31248
-   CVE-2023-31436
-   CVE-2023-35001