{
    "CVE_data_meta": {
        "ASSIGNER": "secalert@redhat.com",
        "ID": "CVE-2015-4177",
        "STATE": "PUBLIC"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "n/a",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "n/a"
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                    "vendor_name": "n/a"
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    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "The collect_mounts function in fs/namespace.c in the Linux kernel before 4.0.5 does not properly consider that it may execute after a path has been unmounted, which allows local users to cause a denial of service (system crash) by leveraging user-namespace root access for an MNT_DETACH umount2 system call."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
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                        "lang": "eng",
                        "value": "n/a"
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    "references": {
        "reference_data": [
            {
                "name": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cd4a40174b71acd021877341684d8bb1dc8ea4ae",
                "refsource": "CONFIRM",
                "url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cd4a40174b71acd021877341684d8bb1dc8ea4ae"
            },
            {
                "name": "[oss-security] 20150529 CVE request Linux kernel: ns: user namespaces panic",
                "refsource": "MLIST",
                "url": "http://openwall.com/lists/oss-security/2015/05/29/5"
            },
            {
                "name": "https://bugzilla.redhat.com/show_bug.cgi?id=1248486",
                "refsource": "CONFIRM",
                "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1248486"
            },
            {
                "name": "https://github.com/torvalds/linux/commit/cd4a40174b71acd021877341684d8bb1dc8ea4ae",
                "refsource": "CONFIRM",
                "url": "https://github.com/torvalds/linux/commit/cd4a40174b71acd021877341684d8bb1dc8ea4ae"
            },
            {
                "name": "http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5",
                "refsource": "CONFIRM",
                "url": "http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5"
            },
            {
                "name": "[oss-security] 20150529 Re: CVE request Linux kernel: ns: user namespaces panic",
                "refsource": "MLIST",
                "url": "http://openwall.com/lists/oss-security/2015/05/29/10"
            },
            {
                "name": "[oss-security] 20150604 Re: Re: CVE request Linux kernel: ns: user namespaces panic",
                "refsource": "MLIST",
                "url": "http://www.openwall.com/lists/oss-security/2015/06/04/5"
            }
        ]
    }
}