CWE
416 476 362
Advisory Published

USN-6344-1: Linux kernel (Azure) vulnerabilities

First published: Wed Sep 06 2023(Updated: )

Zi Fan Tan discovered that the binder IPC implementation in the Linux kernel contained 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-2023-21255) It was discovered that a race condition existed in the f2fs file system in the Linux kernel, leading to a null pointer dereference vulnerability. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service (system crash). (CVE-2023-2898) It was discovered that the DVB Core driver in the Linux kernel did not properly handle locking events in certain situations. A local attacker could use this to cause a denial of service (kernel deadlock). (CVE-2023-31084) Quentin Minster discovered that the KSMBD implementation in the Linux kernel did not properly handle session setup requests. A remote attacker could possibly use this to cause a denial of service (memory exhaustion). (CVE-2023-32247) Quentin Minster discovered that a race condition existed in the KSMBD implementation in the Linux kernel when handling sessions operations. A remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-32250, CVE-2023-32252, CVE-2023-32257) It was discovered that a race condition existed in the KSMBD implementation in the Linux kernel when handling session connections, leading to a use- after-free vulnerability. A remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-32258) It was discovered that the KSMBD implementation in the Linux kernel did not properly validate buffer sizes in certain operations, 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-2023-38426, CVE-2023-38428) It was discovered that the KSMBD implementation in the Linux kernel did not properly calculate the size of certain buffers. A remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-38429)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-6.2.0-1011-azure<6.2.0-1011.11
6.2.0-1011.11
=23.04
All of
ubuntu/linux-image-azure<6.2.0.1011.11
6.2.0.1011.11
=23.04

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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 CVE-2023-21255.

  • What is the severity of CVE-2023-21255?

    The severity of CVE-2023-21255 is not specified in the advisory.

  • How does CVE-2023-21255 impact Linux kernel (Azure)?

    CVE-2023-21255 can be exploited by a local attacker to cause a denial of service or potentially execute arbitrary code.

  • What is the remedy for CVE-2023-21255 in Ubuntu version 23.04 with Linux kernel (Azure) version 6.2.0-1011.11?

    The remedy for CVE-2023-21255 in Ubuntu version 23.04 with Linux kernel (Azure) version 6.2.0-1011.11 is to update the kernel to version 6.2.0-1011.11 or later.

  • Where can I find more information about CVE-2023-21255?

    You can find more information about CVE-2023-21255 on the Ubuntu Security website.

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