CVE-2013-1956

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    CVE-2013-1956

    Published: 24 Apr 2013Last Modified: 10 Apr 2026

    Summary:

    Details: The create_user_ns function in kernel/user_namespace.c in the Linux kernel before 3.8.6 does not check whether a chroot directory exists that differs from the namespace root directory, which allows local users to bypass intended filesystem restrictions via a crafted clone system call.

    References: https://github.com/torvalds/linux/commit/3151527ee007b73a0ebd296010f1c0454a919c7d, http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3151527ee007b73a0ebd296010f1c0454a919c7d, http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.6, http://www.openwall.com/lists/oss-security/2013/04/16/11

    Affected packages

    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