CWE
416
Advisory Published

USN-6396-2: Linux kernel (KVM) vulnerabilities

First published: Thu Oct 05 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-4.15.0-1145-kvm<4.15.0-1145.150
4.15.0-1145.150
=18.04
All of
ubuntu/linux-image-kvm<4.15.0.1145.136
4.15.0.1145.136
=18.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this advisory?

    The vulnerability ID for this advisory is USN-6396-2.

  • What is the severity of the vulnerability?

    The severity of the vulnerability is not mentioned in the given information.

  • Which software is affected by this vulnerability?

    The affected software is the Linux kernel with KVM (Kernel-based Virtual Machine) on Ubuntu 18.04.

  • What is the CVE ID associated with this vulnerability?

    The CVE ID associated with this vulnerability is CVE-2022-27672.

  • How can I fix this vulnerability on Ubuntu 18.04?

    To fix this vulnerability on Ubuntu 18.04, update the Linux kernel packages to version 4.15.0-1145.150 or higher.

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