1. Ubuntu Security Notices
  2. USN-5790-1

USN-5790-1: Linux kernel vulnerabilities

Publication date

6 January 2023

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the BPF verifier in the Linux kernel did not
properly handle internal data structures. A local attacker could use this
to expose sensitive information (kernel memory). (CVE-2021-4159)

It was discovered that a race condition existed in the Android Binder IPC
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-2022-20421)

It was discovered that the Intel 740 frame buffer driver in the Linux
kernel contained a divide by zero vulnerability. A local attacker could use
this to cause a denial of service (system crash). (CVE-2022-3061)

Gwnaun Jung discovered that the SFB packet scheduling implementation in the
Linux kernel contained a use-after-free...

It was discovered that the BPF verifier in the Linux kernel did not
properly handle internal data structures. A local attacker could use this
to expose sensitive information (kernel memory). (CVE-2021-4159)

It was discovered that a race condition existed in the Android Binder IPC
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-2022-20421)

It was discovered that the Intel 740 frame buffer driver in the Linux
kernel contained a divide by zero vulnerability. A local attacker could use
this to cause a denial of service (system crash). (CVE-2022-3061)

Gwnaun Jung discovered that the SFB packet scheduling 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-2022-3586)

Jann Horn discovered a race condition existed in the Linux kernel when
unmapping VMAs in certain situations, resulting in possible use-after-free
vulnerabilities. A local attacker could possibly use this to cause a denial
of service (system crash) or execute arbitrary code. (CVE-2022-39188)

It was discovered that a race condition existed in the EFI capsule loader
driver 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-2022-40307)

Zheng Wang and Zhuorao Yang discovered that the RealTek RTL8712U wireless
driver 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-2022-4095)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
18.04 bionic linux-image-4.15.0-201-lowlatency –  4.15.0-201.212
linux-image-4.15.0-1112-oracle –  4.15.0-1112.123
linux-image-virtual –  4.15.0.201.184
linux-image-aws-lts-18.04 –  4.15.0.1147.145
linux-image-generic –  4.15.0.201.184
linux-image-4.15.0-201-generic –  4.15.0-201.212
linux-image-4.15.0-201-generic-lpae –  4.15.0-201.212
linux-image-4.15.0-1147-aws –  4.15.0-1147.159
linux-image-oracle-lts-18.04 –  4.15.0.1112.117
linux-image-4.15.0-1133-kvm –  4.15.0-1133.138
linux-image-4.15.0-1158-azure –  4.15.0-1158.173
linux-image-dell300x –  4.15.0.1058.57
linux-image-4.15.0-1142-gcp –  4.15.0-1142.158
linux-image-snapdragon –  4.15.0.1143.142
linux-image-raspi2 –  4.15.0.1125.120
linux-image-azure-lts-18.04 –  4.15.0.1158.126
linux-image-4.15.0-1143-snapdragon –  4.15.0-1143.153
linux-image-4.15.0-1058-dell300x –  4.15.0-1058.63
linux-image-gcp-lts-18.04 –  4.15.0.1142.156
linux-image-4.15.0-1125-raspi2 –  4.15.0-1125.133
linux-image-kvm –  4.15.0.1133.124
linux-image-generic-lpae –  4.15.0.201.184
linux-image-lowlatency –  4.15.0.201.184
16.04 xenial linux-image-4.15.0-201-lowlatency –  4.15.0-201.212~16.04.1  
linux-image-lowlatency-hwe-16.04 –  4.15.0.201.186  
linux-image-4.15.0-1112-oracle –  4.15.0-1112.123~16.04.1  
linux-image-oem –  4.15.0.201.186  
linux-image-4.15.0-201-generic –  4.15.0-201.212~16.04.1  
linux-image-4.15.0-1147-aws-hwe –  4.15.0-1147.159~16.04.1  
linux-image-gke –  4.15.0.1142.134  
linux-image-4.15.0-1142-gcp –  4.15.0-1142.158~16.04.1  
linux-image-gcp –  4.15.0.1142.134  
linux-image-aws-hwe –  4.15.0.1147.132  
linux-image-generic-hwe-16.04 –  4.15.0.201.186  
linux-image-oracle –  4.15.0.1112.94  
linux-image-virtual-hwe-16.04 –  4.15.0.201.186  
14.04 trusty linux-image-4.15.0-1158-azure –  4.15.0-1158.173~14.04.1  
linux-image-azure –  4.15.0.1158.125  

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References

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