Linux kernel vulnerabilities

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

-   Ubuntu 20.04 LTS
-   Ubuntu 18.04 LTS
-   Ubuntu 22.04 LTS

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-ibm - Linux kernel for IBM cloud systems

Details

Lonial Con discovered that the netfilter subsystem in the Linux kernel
contained a memory leak when handling certain element flush operations.
A local attacker could use this to expose sensitive information (kernel
memory). (CVE-2023-4569)

Xingyuan Mo discovered that the netfilter subsystem in the Linux kernel
did not properly handle inactive elements in its PIPAPO data structure,
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-2023-6817)

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)

Kevin Rich discovered that the netfilter subsystem in the Linux kernel
did not properly check deactivated elements in certain situations,
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-2024-0193)

Lonial Con discovered that the netfilter subsystem in the Linux kernel
did not properly handle element deactivation in certain cases, 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-2024-1085)

Notselwyn discovered that the netfilter subsystem in the Linux kernel
did not properly handle verdict parameters in certain cases, 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-2024-1086)

In the Linux kernel, the following vulnerability has been resolved: 
net: qualcomm: rmnet: fix global oob in rmnet_policy The variable 
rmnet_link_ops assign a bigger maxtype which leads to a global out-of-
bounds read when parsing the netlink attributes. (CVE-2024-26597)

Update instructions

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

Ubuntu 20.04 LTS
    aws - 103.1
    aws - 103.2
    aws - 103.3
    azure - 103.3
    gcp - 103.2
    gcp - 103.3
    generic - 103.1
    generic - 103.2
    generic - 103.3
    gke - 103.3
    ibm - 103.2
    lowlatency - 103.1
    lowlatency - 103.2
    lowlatency - 103.3

Ubuntu 18.04 LTS
    aws - 103.3
    azure - 103.3
    gcp - 103.3
    generic - 103.3
    lowlatency - 103.3

Ubuntu 22.04 LTS
    aws - 103.1
    aws - 103.2
    aws - 103.3
    azure - 103.1
    azure - 103.2
    azure - 103.3
    gcp - 103.1
    gcp - 103.2
    generic - 103.1
    generic - 103.2
    generic - 103.3
    gke - 103.1
    gke - 103.2
    gke - 103.3
    ibm - 103.1
    ibm - 103.2
    ibm - 103.3

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-2023-4569
-   CVE-2023-6817
-   CVE-2023-51781
-   CVE-2024-0193
-   CVE-2024-1085
-   CVE-2024-1086
-   CVE-2024-26597