Advisory Published

USN-6220-1: Linux kernel vulnerabilities

First published: Wed Jul 12 2023(Updated: )

Hangyu Hua discovered that the Flower classifier implementation in the Linux kernel contained an out-of-bounds write vulnerability. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-35788, LP: #2023577) It was discovered that for some Intel processors the INVLPG instruction implementation did not properly flush global TLB entries when PCIDs are enabled. An attacker could use this to expose sensitive information (kernel memory) or possibly cause undesired behaviors. (LP: #2023220)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-gcp<6.2.0.1008.8
6.2.0.1008.8
=23.04
All of
ubuntu/linux-image-ibm<6.2.0.1004.4
6.2.0.1004.4
=23.04
All of
ubuntu/linux-image-azure<6.2.0.1006.6
6.2.0.1006.6
=23.04
All of
ubuntu/linux-image-oracle<6.2.0.1006.6
6.2.0.1006.6
=23.04
All of
ubuntu/linux-image-6.2.0-1004-ibm<6.2.0-1004.4
6.2.0-1004.4
=23.04
All of
ubuntu/linux-image-6.2.0-1006-oracle<6.2.0-1006.6
6.2.0-1006.6
=23.04
All of
ubuntu/linux-image-6.2.0-1006-azure<6.2.0-1006.6
6.2.0-1006.6
=23.04
All of
ubuntu/linux-image-6.2.0-1008-gcp<6.2.0-1008.8
6.2.0-1008.8
=23.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID of this USN?

    CVE-2023-35788

  • What is the severity of CVE-2023-35788?

    The severity of CVE-2023-35788 is not specified in the USN.

  • How can an attacker exploit CVE-2023-35788?

    An attacker can exploit CVE-2023-35788 by using an out-of-bounds write vulnerability in the Flower classifier implementation in the Linux kernel.

  • What are the affected software versions for CVE-2023-35788?

    The affected software versions for CVE-2023-35788 are Ubuntu 23.04 with the following Linux kernel packages: linux-image-gcp (6.2.0.1008.8), linux-image-ibm (6.2.0.1004.4), linux-image-azure (6.2.0.1006.6), linux-image-oracle (6.2.0.1006.6), linux-image-6.2.0-1004-ibm (6.2.0-1004.4), linux-image-6.2.0-1006-oracle (6.2.0-1006.6), linux-image-6.2.0-1006-azure (6.2.0-1006.6), and linux-image-6.2.0-1008-gcp (6.2.0-1008.8).

  • How do I fix the vulnerability in Ubuntu 23.04?

    To fix the vulnerability in Ubuntu 23.04, update the Linux kernel packages to the recommended versions: linux-image-gcp (6.2.0.1008.8), linux-image-ibm (6.2.0.1004.4), linux-image-azure (6.2.0.1006.6), linux-image-oracle (6.2.0.1006.6), linux-image-6.2.0-1004-ibm (6.2.0-1004.4), linux-image-6.2.0-1006-oracle (6.2.0-1006.6), linux-image-6.2.0-1006-azure (6.2.0-1006.6), and linux-image-6.2.0-1008-gcp (6.2.0-1008.8).

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