{
    "CVE_data_meta": {
        "ASSIGNER": "security@ubuntu.com",
        "DATE_PUBLIC": "2019-11-08T00:00:00.000Z",
        "ID": "CVE-2019-15794",
        "STATE": "PUBLIC",
        "TITLE": "Reference counting error in overlayfs/shiftfs error path when used in conjuction with aufs"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux kernel",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "5.3 kernel",
                                            "version_value": "5.3.0-24.26"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "5.0 kernel",
                                            "version_value": "5.0.0-37.40"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Ubuntu"
                }
            ]
        }
    },
    "credit": [
        {
            "lang": "eng",
            "value": "Jann Horn of Google Project Zero"
        }
    ],
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_file, leading to a refcount underflow."
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.0.9"
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-672 Operation on a Resource after Expiration or Release"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=270d16ae48a4dbf1c7e25e94cc3e38b4bea37635",
                "name": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=270d16ae48a4dbf1c7e25e94cc3e38b4bea37635"
            },
            {
                "refsource": "MISC",
                "url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=ef81780548d20a786cc77ed4203fca146fd81ce3",
                "name": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=ef81780548d20a786cc77ed4203fca146fd81ce3"
            },
            {
                "refsource": "MISC",
                "url": "https://usn.ubuntu.com/usn/usn-4208-1",
                "name": "https://usn.ubuntu.com/usn/usn-4208-1"
            },
            {
                "refsource": "MISC",
                "url": "https://usn.ubuntu.com/usn/usn-4209-1",
                "name": "https://usn.ubuntu.com/usn/usn-4209-1"
            }
        ]
    },
    "source": {
        "defect": [
            "https://bugs.launchpad.net/bugs/1850994"
        ],
        "discovery": "EXTERNAL"
    }
}