1. Ubuntu Security Notices
  2. USN-6127-1

USN-6127-1: Linux kernel vulnerabilities

Publication date

31 May 2023

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Patryk Sondej and Piotr Krysiuk discovered that a race condition existed in
the netfilter subsystem of the Linux kernel when processing batch requests,
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-2023-32233)

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)

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). (

Patryk Sondej and Piotr Krysiuk discovered that a race condition existed in
the netfilter subsystem of the Linux kernel when processing batch requests,
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-2023-32233)

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)

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)

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)

Jean-Baptiste Cayrou discovered that the shiftfs file system in the Ubuntu
Linux kernel contained a race condition when handling inode locking in some
situations. A local attacker could use this to cause a denial of service
(kernel deadlock). (CVE-2023-2612)

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
22.10 kinetic linux-image-virtual –  5.19.0.43.39
linux-image-5.19.0-1019-raspi –  5.19.0-1019.26
linux-image-generic-64k –  5.19.0.43.39
linux-image-generic –  5.19.0.43.39
linux-image-aws –  5.19.0.1026.23
linux-image-5.19.0-1025-lowlatency –  5.19.0-1025.26
linux-image-5.19.0-1025-lowlatency-64k –  5.19.0-1025.26
linux-image-raspi –  5.19.0.1019.18
linux-image-5.19.0-1023-ibm –  5.19.0-1023.25
linux-image-ibm –  5.19.0.1023.20
linux-image-lowlatency-64k –  5.19.0.1025.21
linux-image-5.19.0-1027-azure –  5.19.0-1027.30
linux-image-raspi-nolpae –  5.19.0.1019.18
linux-image-5.19.0-43-generic –  5.19.0-43.44
linux-image-5.19.0-1025-gcp –  5.19.0-1025.27
linux-image-azure –  5.19.0.1027.22
linux-image-5.19.0-1024-oracle –  5.19.0-1024.27
linux-image-kvm –  5.19.0.1024.21
linux-image-5.19.0-43-generic-lpae –  5.19.0-43.44
linux-image-gcp –  5.19.0.1025.21
linux-image-generic-lpae –  5.19.0.43.39
linux-image-5.19.0-43-generic-64k –  5.19.0-43.44
linux-image-5.19.0-1019-raspi-nolpae –  5.19.0-1019.26
linux-image-oracle –  5.19.0.1024.20
linux-image-5.19.0-1024-kvm –  5.19.0-1024.25
linux-image-5.19.0-1026-aws –  5.19.0-1026.27
linux-image-lowlatency –  5.19.0.1025.21
22.04 jammy linux-image-gkeop –  5.15.0.1021.20
linux-image-virtual –  5.15.0.73.71
linux-image-5.15.0-73-generic –  5.15.0-73.80
linux-image-5.19.0-43-generic –  5.19.0-43.44~22.04.1
linux-image-5.15.0-1031-ibm –  5.15.0-1031.34
linux-image-azure –  5.15.0.1039.35
linux-image-5.19.0-43-generic-64k –  5.19.0-43.44~22.04.1
linux-image-generic-64k-hwe-22.04 –  5.19.0.43.44~22.04.17
linux-image-kvm –  5.15.0.1034.30
linux-image-lowlatency –  5.15.0.73.78
linux-image-generic-64k –  5.15.0.73.71
linux-image-gke-5.15 –  5.15.0.1034.33
linux-image-5.15.0-1021-gkeop –  5.15.0-1021.26
linux-image-5.15.0-73-lowlatency –  5.15.0-73.80
linux-image-5.15.0-1034-kvm –  5.15.0-1034.39
linux-image-5.15.0-1036-oracle –  5.15.0-1036.42
linux-image-gkeop-5.15 –  5.15.0.1021.20
linux-image-5.15.0-1039-azure –  5.15.0-1039.46
linux-image-generic-lpae-hwe-22.04 –  5.19.0.43.44~22.04.17
linux-image-5.15.0-73-lowlatency-64k –  5.15.0-73.80
linux-image-generic-lpae –  5.15.0.73.71
linux-image-ibm –  5.15.0.1031.27
linux-image-virtual-hwe-22.04 –  5.19.0.43.44~22.04.17
linux-image-azure-lts-22.04 –  5.15.0.1039.35
linux-image-aws-lts-22.04 –  5.15.0.1037.36
linux-image-5.15.0-73-generic-64k –  5.15.0-73.80
linux-image-gke –  5.15.0.1034.33
linux-image-gcp-lts-22.04 –  5.15.0.1035.31
linux-image-oracle –  5.15.0.1036.31
linux-image-5.15.0-1034-gke –  5.15.0-1034.39
linux-image-generic –  5.15.0.73.71
linux-image-generic-hwe-22.04 –  5.19.0.43.44~22.04.17
linux-image-5.15.0-1037-aws –  5.15.0-1037.41
linux-image-5.19.0-43-generic-lpae –  5.19.0-43.44~22.04.1
linux-image-5.15.0-1035-gcp –  5.15.0-1035.43
linux-image-lowlatency-64k –  5.15.0.73.78
linux-image-5.15.0-73-generic-lpae –  5.15.0-73.80
20.04 focal linux-image-5.15.0-1039-azure –  5.15.0-1039.46~20.04.1
linux-image-5.15.0-1034-gke –  5.15.0-1034.39~20.04.1
linux-image-virtual-hwe-20.04 –  5.15.0.73.80~20.04.34
linux-image-aws –  5.15.0.1037.41~20.04.26
linux-image-azure-cvm –  5.15.0.1039.46~20.04.29
linux-image-gke-5.15 –  5.15.0.1034.39~20.04.1
linux-image-lowlatency-hwe-20.04 –  5.15.0.73.80~20.04.31
linux-image-generic-hwe-20.04 –  5.15.0.73.80~20.04.34
linux-image-5.15.0-73-generic –  5.15.0-73.80~20.04.1
linux-image-5.15.0-73-lowlatency –  5.15.0-73.80~20.04.1
linux-image-oem-20.04c –  5.15.0.73.80~20.04.34
linux-image-oem-20.04b –  5.15.0.73.80~20.04.34
linux-image-oem-20.04d –  5.15.0.73.80~20.04.34
linux-image-azure –  5.15.0.1039.46~20.04.29
linux-image-5.15.0-1037-aws –  5.15.0-1037.41~20.04.1
linux-image-oem-20.04 –  5.15.0.73.80~20.04.34
linux-image-5.15.0-73-generic-lpae –  5.15.0-73.80~20.04.1
linux-image-5.15.0-73-generic-64k –  5.15.0-73.80~20.04.1
linux-image-5.15.0-1036-oracle –  5.15.0-1036.42~20.04.1
linux-image-gcp –  5.15.0.1035.43~20.04.1
linux-image-5.15.0-73-lowlatency-64k –  5.15.0-73.80~20.04.1
linux-image-5.15.0-1035-gcp –  5.15.0-1035.43~20.04.1
linux-image-generic-64k-hwe-20.04 –  5.15.0.73.80~20.04.34
linux-image-oracle –  5.15.0.1036.42~20.04.1
linux-image-generic-lpae-hwe-20.04 –  5.15.0.73.80~20.04.34
linux-image-lowlatency-64k-hwe-20.04 –  5.15.0.73.80~20.04.31

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