cvelist/2021/3xxx/CVE-2021-3492.json

{
    "CVE_data_meta": {
        "ASSIGNER": "security@ubuntu.com",
        "DATE_PUBLIC": "2021-04-15T00:00:00.000Z",
        "ID": "CVE-2021-3492",
        "STATE": "PUBLIC",
        "TITLE": "Ubuntu linux kernel shiftfs file system double free vulnerability"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux kernel",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "5.8 kernel",
                                            "version_value": "5.8.0-50.56"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "5.4 kernel",
                                            "version_value": "5.4.0-72.80 "
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Ubuntu"
                }
            ]
        }
    },
    "credit": [
        {
            "lang": "eng",
            "value": "Vincent Dehors of Synactiv Digital Security"
        }
    ],
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562."
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.0.9"
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-415: Double Free"
                    }
                ]
            },
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-401: Missing Release of Memory after Effective Lifetime"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "url": "https://www.openwall.com/lists/oss-security/2021/04/16/2",
                "name": "https://www.openwall.com/lists/oss-security/2021/04/16/2"
            },
            {
                "refsource": "MISC",
                "url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6",
                "name": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6"
            },
            {
                "refsource": "MISC",
                "url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333",
                "name": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333"
            },
            {
                "refsource": "MISC",
                "url": "https://ubuntu.com/security/notices/USN-4917-1",
                "name": "https://ubuntu.com/security/notices/USN-4917-1"
            },
            {
                "refsource": "MISC",
                "name": "https://www.zerodayinitiative.com/advisories/ZDI-21-422/",
                "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-422/"
            },
            {
                "refsource": "MISC",
                "name": "http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html",
                "url": "http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html"
            }
        ]
    },
    "source": {
        "discovery": "EXTERNAL"
    }
}