CWE
416 476 362
Advisory Published

USN-6339-2: Linux kernel vulnerabilities

First published: Fri Sep 08 2023(Updated: )

It was discovered that the NTFS file system implementation in the Linux kernel did not properly validate MFT flags in certain situations. An attacker could use this to construct a malicious NTFS image that, when mounted and operated on, could cause a denial of service (system crash). (CVE-2022-48425) 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) 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 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-5.15.0-1027-gkeop<5.15.0-1027.32~20.04.1
5.15.0-1027.32~20.04.1
=20.04
All of
ubuntu/linux-image-5.15.0-1041-gcp<5.15.0-1041.49~20.04.1
5.15.0-1041.49~20.04.1
=20.04
All of
ubuntu/linux-image-gcp<5.15.0.1041.49~20.04.1
5.15.0.1041.49~20.04.1
=20.04
All of
ubuntu/linux-image-gkeop-5.15<5.15.0.1027.32~20.04.23
5.15.0.1027.32~20.04.23
=20.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-6339-2?

    The severity of USN-6339-2 is high.

  • How can an attacker exploit the vulnerability in USN-6339-2?

    An attacker can exploit the vulnerability in USN-6339-2 by constructing a malicious NTFS image that, when mounted and operated on, could cause a denial of service (system crash).

  • Which Linux kernel versions are affected by USN-6339-2?

    Linux kernel versions 5.15.0-1027-gkeop, 5.15.0-1041-gcp, and 5.15.0.1027.32~20.04.23 are affected by USN-6339-2.

  • How do I fix the vulnerability in USN-6339-2?

    To fix the vulnerability in USN-6339-2, update your Ubuntu installation to Linux kernel version 5.15.0-1027.32~20.04.1, 5.15.0-1041.49~20.04.1, or 5.15.0.1041.49~20.04.1 depending on the affected package.

  • Where can I find more information about USN-6339-2?

    You can find more information about USN-6339-2 on the Ubuntu security advisory page: [CVE-2023-21255](https://ubuntu.com/security/CVE-2023-21255), [CVE-2023-31084](https://ubuntu.com/security/CVE-2023-31084), and [CVE-2023-3212](https://ubuntu.com/security/CVE-2023-3212).

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