CWE
416
Advisory Published

USN-6396-3: Linux kernel (Azure) vulnerabilities

First published: Tue Oct 17 2023(Updated: )

It was discovered that some AMD x86-64 processors with SMT enabled could speculatively execute instructions using a return address from a sibling thread. A local attacker could possibly use this to expose sensitive information. (CVE-2022-27672) Daniel Moghimi discovered that some Intel(R) Processors did not properly clear microarchitectural state after speculative execution of various instructions. A local unprivileged user could use this to obtain to sensitive information. (CVE-2022-40982) 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) 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 bluetooth subsystem in the Linux kernel did not properly handle L2CAP socket release, 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-2023-40283) It was discovered that some network classifier implementations in the Linux kernel contained use-after-free vulnerabilities. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-4128)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.15.0-1170-azure<4.15.0-1170.185~14.04.1
4.15.0-1170.185~14.04.1
=14.04
All of
ubuntu/linux-image-azure<4.15.0.1170.136
4.15.0.1170.136
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this Linux kernel vulnerability in Azure?

    The vulnerability ID for this Linux kernel vulnerability in Azure is CVE-2022-27672.

  • What is the severity of the Linux kernel vulnerability in Azure with ID CVE-2022-27672?

    The severity of the Linux kernel vulnerability in Azure with ID CVE-2022-27672 is not specified.

  • How does the Linux kernel vulnerability in Azure with ID CVE-2022-27672 work?

    The Linux kernel vulnerability in Azure with ID CVE-2022-27672 allows some AMD x86-64 processors with SMT enabled to speculatively execute instructions using a return address from a sibling thread, potentially exposing sensitive information.

  • Which versions of Ubuntu Linux are affected by the Linux kernel vulnerability in Azure with ID CVE-2022-27672?

    Ubuntu Linux version 14.04 with Linux kernel versions 4.15.0-1170-azure up to exclusive version 4.15.0-1170.185~14.04.1 and Linux kernel version 4.15.0.1170.136 for the linux-image-azure package are affected by the vulnerability.

  • How can I fix the Linux kernel vulnerability in Azure with ID CVE-2022-27672?

    To fix the Linux kernel vulnerability in Azure with ID CVE-2022-27672, update the linux-image-4.15.0-1170-azure package to version 4.15.0-1170.185~14.04.1 or higher, and update the linux-image-azure package to version 4.15.0.1170.136 or higher.

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