1. Ubuntu Security Notices
  2. USN-6416-1

USN-6416-1: 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 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)

Daniel Trujillo, Johannes Wikner, and Kaveh Razavi discovered that some AMD
processors utilising speculative execution and branch prediction may allow
unauthorised memory reads via a speculative side-channel attack. A local
attacker could use this to expose sensitive information, including kernel
memory. (CVE-2023-20569)

It was discovered that the IPv6 RPL protocol implementation in the Linux
kernel did not properly handle user-supplied data. A remote attacker could
use this to cause a denial of service (system crash). (CVE-2023-2156)

Davide Ornaghi discovered that the...

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)

Daniel Trujillo, Johannes Wikner, and Kaveh Razavi discovered that some AMD
processors utilising speculative execution and branch prediction may allow
unauthorised memory reads via a speculative side-channel attack. A local
attacker could use this to expose sensitive information, including kernel
memory. (CVE-2023-20569)

It was discovered that the IPv6 RPL protocol implementation in the Linux
kernel did not properly handle user-supplied data. A remote attacker could
use this to cause a denial of service (system crash). (CVE-2023-2156)

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)

Chih-Yen Chang discovered that the KSMBD implementation in the Linux kernel
did not properly validate command payload size, leading to a out-of-bounds
read vulnerability. A remote attacker could possibly use this to cause a
denial of service (system crash). (CVE-2023-38432)

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)

Laurence Wit discovered that the KSMBD implementation in the Linux kernel
did not properly validate a buffer size in certain situations, leading to
an out-of-bounds read vulnerability. A remote attacker could use this to
cause a denial of service (system crash) or possibly expose sensitive
information. (CVE-2023-3865)

Laurence Wit discovered that the KSMBD implementation in the Linux kernel
contained a null pointer dereference vulnerability when handling handling
chained requests. A remote attacker could use this to cause a denial of
service (system crash). (CVE-2023-3866)

It was discovered that the Siano USB MDTV receiver device driver in the
Linux kernel did not properly handle device initialization failures in
certain situations, leading to a use-after-free vulnerability. A physically
proximate attacker could use this cause a denial of service (system crash).
(CVE-2023-4132)

Andy Nguyen discovered that the KVM implementation for AMD processors in
the Linux kernel with Secure Encrypted Virtualization (SEV) contained a
race condition when accessing the GHCB page. A local attacker in a SEV
guest VM could possibly use this to cause a denial of service (host system
crash). (CVE-2023-4155)

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)

Maxim Suhanov discovered that the exFAT file system implementation in the
Linux kernel did not properly check a file name length, leading to an out-
of-bounds write vulnerability. An attacker could use this to construct a
malicious exFAT image that, when mounted and operated on, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2023-4273)

Thelford Williams discovered that the Ceph file system messenger protocol
implementation in the Linux kernel did not properly validate frame segment
length in certain situation, leading to a buffer overflow vulnerability. A
remote attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2023-44466)

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
22.04 jammy linux-image-5.15.0-1030-gkeop –  5.15.0-1030.35
linux-image-5.15.0-1037-nvidia –  5.15.0-1037.37
linux-image-5.15.0-1037-nvidia-lowlatency –  5.15.0-1037.37
linux-image-5.15.0-1040-ibm –  5.15.0-1040.43
linux-image-5.15.0-1044-gcp –  5.15.0-1044.52
linux-image-5.15.0-1044-gke –  5.15.0-1044.49
linux-image-5.15.0-1044-kvm –  5.15.0-1044.49
linux-image-5.15.0-1045-oracle –  5.15.0-1045.51
linux-image-5.15.0-1047-aws –  5.15.0-1047.52
linux-image-5.15.0-1049-azure –  5.15.0-1049.56
linux-image-5.15.0-1049-azure-fde –  5.15.0-1049.56.1
linux-image-5.15.0-86-generic –  5.15.0-86.96
linux-image-5.15.0-86-generic-64k –  5.15.0-86.96
linux-image-5.15.0-86-generic-lpae –  5.15.0-86.96
linux-image-5.15.0-86-lowlatency –  5.15.0-86.95
linux-image-5.15.0-86-lowlatency-64k –  5.15.0-86.95
linux-image-aws-lts-22.04 –  5.15.0.1047.46
linux-image-azure-fde-lts-22.04 –  5.15.0.1049.56.27
linux-image-azure-lts-22.04 –  5.15.0.1049.45
linux-image-gcp-lts-22.04 –  5.15.0.1044.40
linux-image-generic –  5.15.0.86.83
linux-image-generic-64k –  5.15.0.86.83
linux-image-generic-lpae –  5.15.0.86.83
linux-image-gke –  5.15.0.1044.43
linux-image-gke-5.15 –  5.15.0.1044.43
linux-image-gkeop –  5.15.0.1030.29
linux-image-gkeop-5.15 –  5.15.0.1030.29
linux-image-ibm –  5.15.0.1040.36
linux-image-kvm –  5.15.0.1044.40
linux-image-lowlatency –  5.15.0.86.88
linux-image-lowlatency-64k –  5.15.0.86.88
linux-image-nvidia –  5.15.0.1037.37
linux-image-nvidia-lowlatency –  5.15.0.1037.37
linux-image-oracle –  5.15.0.1045.40
linux-image-oracle-lts-22.04 –  5.15.0.1045.40
linux-image-virtual –  5.15.0.86.83
20.04 focal linux-image-5.15.0-1030-gkeop –  5.15.0-1030.35~20.04.1
linux-image-5.15.0-1040-ibm –  5.15.0-1040.43~20.04.1
linux-image-5.15.0-1044-gcp –  5.15.0-1044.52~20.04.1
linux-image-5.15.0-1047-aws –  5.15.0-1047.52~20.04.1
linux-image-5.15.0-1049-azure –  5.15.0-1049.56~20.04.1
linux-image-5.15.0-1049-azure-fde –  5.15.0-1049.56~20.04.1.1
linux-image-5.15.0-86-lowlatency –  5.15.0-86.95~20.04.1
linux-image-5.15.0-86-lowlatency-64k –  5.15.0-86.95~20.04.1
linux-image-aws –  5.15.0.1047.52~20.04.35
linux-image-azure –  5.15.0.1049.56~20.04.38
linux-image-azure-cvm –  5.15.0.1049.56~20.04.38
linux-image-azure-fde –  5.15.0.1049.56~20.04.1.27
linux-image-gcp –  5.15.0.1044.52~20.04.1
linux-image-gkeop-5.15 –  5.15.0.1030.35~20.04.26
linux-image-ibm –  5.15.0.1040.43~20.04.12
linux-image-lowlatency-64k-hwe-20.04 –  5.15.0.86.95~20.04.41
linux-image-lowlatency-hwe-20.04 –  5.15.0.86.95~20.04.41

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References

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