UBUNTU-CVE-2023-4194

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    UBUNTU-CVE-2023-4194

    Published: 7 Aug 2023Last Modified: 22 Apr 2026
    Upstream:
    CVE-2023-4194
    Aliases:
    USN-6343-1
    USN-6385-1
    USN-6412-1

    Summary:

    Details: A flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: tap_open(): correctly initialize socket uid"), pass "inode->i_uid" to sock_init_data_uid() as the last parameter and that turns out to not be accurate.

    References: https://ubuntu.com/security/CVE-2023-4194, https://git.kernel.org/linus/9bc3047374d5bec163e83e743709e23753376f0c, https://git.kernel.org/linus/5c9241f3ceab3257abe2923a59950db0dc8bb737, https://lore.kernel.org/all/[email protected]/, https://lore.kernel.org/all/[email protected]/, https://access.redhat.com/security/cve/CVE-2023-4194, https://lore.kernel.org/all/[email protected]/, https://ubuntu.com/security/notices/USN-6343-1, https://ubuntu.com/security/notices/USN-6385-1, https://ubuntu.com/security/notices/USN-6412-1, https://ubuntu.com/security/notices/USN-6416-1, https://ubuntu.com/security/notices/USN-6417-1, https://ubuntu.com/security/notices/USN-6416-2, https://ubuntu.com/security/notices/USN-6416-3, https://ubuntu.com/security/notices/USN-6445-1, https://ubuntu.com/security/notices/USN-6445-2, https://ubuntu.com/security/notices/USN-6466-1, https://www.cve.org/CVERecord?id=CVE-2023-4194

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/[email protected]~16.04.1?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-2023-4194 | CVE-DB