1. Ubuntu Security Notices
  2. USN-6417-1

USN-6417-1: Linux kernel vulnerabilities

Publication date

4 October 2023

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the eBPF implementation in the Linux kernel
contained a race condition around read-only maps. A privileged attacker
could use this to modify read-only maps. (CVE-2021-4001)

It was discovered that the IPv6 implementation in the Linux kernel
contained a high rate of hash collisions in connection lookup table. A
remote attacker could use this to cause a denial of service (excessive CPU
consumption). (CVE-2023-1206)

Yang Lan discovered that the GFS2 file system implementation in the Linux
kernel could attempt to dereference a null pointer in some situations. An
attacker could use this to construct a malicious GFS2 image that, when
mounted and operated on, could cause a denial of service (system crash).
(CVE-2023-3212)

Davide Ornaghi discovered that the DECnet network protocol...

It was discovered that the eBPF implementation in the Linux kernel
contained a race condition around read-only maps. A privileged attacker
could use this to modify read-only maps. (CVE-2021-4001)

It was discovered that the IPv6 implementation in the Linux kernel
contained a high rate of hash collisions in connection lookup table. A
remote attacker could use this to cause a denial of service (excessive CPU
consumption). (CVE-2023-1206)

Yang Lan discovered that the GFS2 file system implementation in the Linux
kernel could attempt to dereference a null pointer in some situations. An
attacker could use this to construct a malicious GFS2 image that, when
mounted and operated on, could cause a denial of service (system crash).
(CVE-2023-3212)

Davide Ornaghi discovered that the DECnet network protocol implementation
in the Linux kernel contained a null pointer dereference vulnerability. A
remote attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. Please note that kernel support for the
DECnet has been removed to resolve this CVE. (CVE-2023-3338)

It was discovered that the NFC implementation in the Linux kernel contained
a use-after-free vulnerability when performing peer-to-peer communication
in certain conditions. A privileged attacker could use this to cause a
denial of service (system crash) or possibly expose sensitive information
(kernel memory). (CVE-2023-3863)

It was discovered that the TUN/TAP driver in the Linux kernel did not
properly initialize socket data. A local attacker could use this to cause a
denial of service (system crash). (CVE-2023-4194)

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
20.04 focal linux-image-5.4.0-1023-iot –  5.4.0-1023.24
linux-image-5.4.0-1031-xilinx-zynqmp –  5.4.0-1031.35
linux-image-5.4.0-1058-ibm –  5.4.0-1058.63
linux-image-5.4.0-1072-bluefield –  5.4.0-1072.78
linux-image-5.4.0-1078-gkeop –  5.4.0-1078.82
linux-image-5.4.0-1095-raspi –  5.4.0-1095.106
linux-image-5.4.0-1100-kvm –  5.4.0-1100.106
linux-image-5.4.0-1110-oracle –  5.4.0-1110.119
linux-image-5.4.0-1111-aws –  5.4.0-1111.120
linux-image-5.4.0-1115-gcp –  5.4.0-1115.124
linux-image-5.4.0-1117-azure –  5.4.0-1117.124
linux-image-5.4.0-164-generic –  5.4.0-164.181
linux-image-5.4.0-164-generic-lpae –  5.4.0-164.181
linux-image-5.4.0-164-lowlatency –  5.4.0-164.181
linux-image-aws-lts-20.04 –  5.4.0.1111.108
linux-image-azure-lts-20.04 –  5.4.0.1117.110
linux-image-bluefield –  5.4.0.1072.67
linux-image-gcp-lts-20.04 –  5.4.0.1115.117
linux-image-generic –  5.4.0.164.161
linux-image-generic-lpae –  5.4.0.164.161
linux-image-gkeop –  5.4.0.1078.76
linux-image-gkeop-5.4 –  5.4.0.1078.76
linux-image-ibm-lts-20.04 –  5.4.0.1058.87
linux-image-kvm –  5.4.0.1100.95
linux-image-lowlatency –  5.4.0.164.161
linux-image-oem –  5.4.0.164.161
linux-image-oem-osp1 –  5.4.0.164.161
linux-image-oracle-lts-20.04 –  5.4.0.1110.103
linux-image-raspi –  5.4.0.1095.125
linux-image-raspi2 –  5.4.0.1095.125
linux-image-virtual –  5.4.0.164.161
linux-image-xilinx-zynqmp –  5.4.0.1031.32
18.04 bionic linux-image-5.4.0-1058-ibm –  5.4.0-1058.63~18.04.1  
linux-image-5.4.0-1095-raspi –  5.4.0-1095.106~18.04.1  
linux-image-5.4.0-1110-oracle –  5.4.0-1110.119~18.04.1  
linux-image-5.4.0-1111-aws –  5.4.0-1111.120~18.04.1  
linux-image-5.4.0-1115-gcp –  5.4.0-1115.124~18.04.1  
linux-image-5.4.0-1117-azure –  5.4.0-1117.124~18.04.1  
linux-image-5.4.0-164-generic –  5.4.0-164.181~18.04.1  
linux-image-5.4.0-164-lowlatency –  5.4.0-164.181~18.04.1  
linux-image-aws –  5.4.0.1111.89  
linux-image-azure –  5.4.0.1117.90  
linux-image-gcp –  5.4.0.1115.91  
linux-image-generic-hwe-18.04 –  5.4.0.164.181~18.04.131  
linux-image-ibm –  5.4.0.1058.69  
linux-image-lowlatency-hwe-18.04 –  5.4.0.164.181~18.04.131  
linux-image-oem –  5.4.0.164.181~18.04.131  
linux-image-oem-osp1 –  5.4.0.164.181~18.04.131  
linux-image-oracle –  5.4.0.1110.119~18.04.82  
linux-image-raspi-hwe-18.04 –  5.4.0.1095.92  
linux-image-snapdragon-hwe-18.04 –  5.4.0.164.181~18.04.131  
linux-image-virtual-hwe-18.04 –  5.4.0.164.181~18.04.131  

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

id="usn"

Have additional questions?

Talk to a member of the team ›