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
-   linux-oem - Linux kernel for OEM systems

Details

Aaron Adams discovered that the netfilter subsystem in the Linux kernel
did not properly handle the removal of stateful expressions in some
situations, leading to a use-after-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2022-1966)

Ziming Zhang discovered that the netfilter subsystem in the Linux kernel
did not properly validate sets with multiple ranged fields. A local
attacker could use this to cause a denial of service or execute
arbitrary code. (CVE-2022-1972)

It was discovered that the implementation of POSIX timers in the Linux
kernel did not properly clean up timers in some situations. A local
attacker could use this to cause a denial of service (system crash) or
execute arbitrary code. (CVE-2022-2585)

It was discovered that the netfilter subsystem of the Linux kernel did
not prevent one nft object from referencing an nft set in another nft
table, leading to a use-after-free vulnerability. A local attacker could
use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2022-2586)

Zhenpeng Lin discovered that the network packet scheduler implementation
in the Linux kernel did not properly remove all references to a route
filter before freeing it in some situations. A local attacker could use
this to cause a denial of service (system crash) or execute arbitrary
code. (CVE-2022-2588)

It was discovered that the Linux kernel did not properly restrict access
to the kernel debugger when booted in secure boot environments. A
privileged attacker could use this to bypass UEFI Secure Boot
restrictions. (CVE-2022-21499)

Kyle Zeng discovered that the Network Queuing and Scheduling subsystem
of the Linux kernel did not properly perform reference counting in some
situations, leading to a use-after-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2022-29581)

Arthur Mongodin discovered that the netfilter subsystem in the Linux
kernel did not properly perform data validation. A local attacker could
use this to escalate privileges in certain situations. (CVE-2022-34918)

Update instructions

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

Ubuntu 20.04 LTS
    aws - 89.1
    azure - 89.1
    azure - 89.2
    gcp - 89.1
    generic - 89.1
    generic - 89.2
    gke - 89.1
    gke - 89.2
    gkeop - 89.1
    ibm - 89.1
    lowlatency - 89.1

Ubuntu 18.04 LTS
    aws - 89.1
    azure - 89.1
    gcp - 89.1
    generic - 89.1
    gke - 89.1
    gke - 89.2
    gkeop - 89.1
    gkeop - 89.2
    ibm - 89.1
    lowlatency - 89.1
    oem - 89.1

Ubuntu 16.04 ESM
    aws - 89.1
    azure - 89.1
    gcp - 89.1
    generic - 89.1
    lowlatency - 89.1
    lowlatency - 89.2

Ubuntu 22.04 LTS
    aws - 89.1
    azure - 89.1
    gcp - 89.1
    generic - 89.1
    gke - 89.1
    ibm - 89.1
    lowlatency - 88.1

Ubuntu 14.04 ESM
    generic - 89.1
    lowlatency - 89.1

Support Information

Kernels older than the levels listed below do not receive livepatch
updates. If you are running a kernel version earlier than the one listed
below, please upgrade your kernel as soon as possible.

Ubuntu 20.04 LTS
    linux-aws-5.15 - 5.15.0-1000
    linux-aws - 5.4.0-1009
    linux-azure-5.15 - 5.15.0-1069
    linux-azure - 5.4.0-1010
    linux-gcp-5.15 - 5.15.0-1000
    linux-gcp - 5.4.0-1009
    linux-gke-5.15 - 5.15.0-1000
    linux-gke - 5.4.0-1033
    linux-gkeop - 5.4.0-1009
    linux-hwe - 5.15.0-0
    linux-ibm-5.15 - 5.15.0-1000
    linux-ibm - 5.4.0-1009
    linux-oem - 5.4.0-26
    linux - 5.4.0-26

Ubuntu 18.04 LTS
    linux-aws-5.4 - 5.4.0-1069
    linux-aws - 4.15.0-1054
    linux-azure-4.15 - 4.15.0-1115
    linux-azure-5.4 - 5.4.0-1069
    linux-gcp-4.15 - 4.15.0-1121
    linux-gcp-5.4 - 5.4.0-1069
    linux-gke-4.15 - 4.15.0-1076
    linux-gke-5.4 - 5.4.0-1009
    linux-gkeop-5.4 - 5.4.0-1007
    linux-hwe-5.4 - 5.4.0-26
    linux-ibm-5.4 - 5.4.0-1009
    linux-oem - 4.15.0-1063
    linux - 4.15.0-69

Ubuntu 16.04 ESM
    linux-aws-hwe - 4.15.0-1126
    linux-aws - 4.4.0-1098
    linux-azure - 4.15.0-1063
    linux-gcp - 4.15.0-1118
    linux-hwe - 4.15.0-69
    linux - 4.4.0-168
    linux - 4.4.0-211

Ubuntu 22.04 LTS
    linux-aws - 5.15.0-1000
    linux-azure - 5.15.0-1000
    linux-gcp - 5.15.0-1000
    linux-gke - 5.15.0-1000
    linux-ibm - 5.15.0-1000
    linux - 5.15.0-24
    linux - 5.15.0-25

Ubuntu 14.04 ESM
    linux-lts-xenial - 4.4.0-168

References

-   CVE-2022-1966
-   CVE-2022-1972
-   CVE-2022-2585
-   CVE-2022-2586
-   CVE-2022-2588
-   CVE-2022-21499
-   CVE-2022-29581
-   CVE-2022-34918