UBUNTU-CVE-2023-38431

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    UBUNTU-CVE-2023-38431

    Published: 18 Jul 2023Last Modified: 9 Sept 2026
    Upstream:
    CVE-2023-38431
    Aliases:
    USN-6412-1
    USN-6466-1
    USN-6725-1

    Summary:

    Details: An issue was discovered in the Linux kernel before 6.3.8. fs/smb/server/connection.c in ksmbd does not validate the relationship between the NetBIOS header's length field and the SMB header sizes, via pdu_size in ksmbd_conn_handler_loop, leading to an out-of-bounds read.

    References: https://ubuntu.com/security/CVE-2023-38431, https://git.kernel.org/linus/368ba06881c395f1c9a7ba22203cf8d78b4addc0, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/smb/server?id=368ba06881c395f1c9a7ba22203cf8d78b4addc0, https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.8, https://ubuntu.com/security/notices/USN-6412-1, https://ubuntu.com/security/notices/USN-6466-1, https://ubuntu.com/security/notices/USN-6725-1, https://www.cve.org/CVERecord?id=CVE-2023-38431, https://ubuntu.com/security/notices/USN-6725-2

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.8.0-28.30~16.04.1
    4.8.0-30.32~16.04.1
    4.8.0-32.34~16.04.1
    4.8.0-34.36~16.04.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2023-38431 | CVE-DB