{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-47280",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: Fix use-after-free read in drm_getunique()\n\nThere is a time-of-check-to-time-of-use error in drm_getunique() due\nto retrieving file_priv->master prior to locking the device's master\nmutex.\n\nAn example can be seen in the crash report of the use-after-free error\nfound by Syzbot:\nhttps://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803\n\nIn the report, the master pointer was used after being freed. This is\nbecause another process had acquired the device's master mutex in\ndrm_setmaster_ioctl(), then overwrote fpriv->master in\ndrm_new_set_master(). The old value of fpriv->master was subsequently\nfreed before the mutex was unlocked.\n\nTo fix this, we lock the device's master mutex before retrieving the\npointer from from fpriv->master. This patch passes the Syzbot\nreproducer test."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "1da177e4c3f4",
                                            "version_value": "17dab9326ff2"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "4.14.237",
                                                        "lessThanOrEqual": "4.14.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "4.19.195",
                                                        "lessThanOrEqual": "4.19.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.4.126",
                                                        "lessThanOrEqual": "5.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.10.44",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.12.11",
                                                        "lessThanOrEqual": "5.12.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.13",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
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        "reference_data": [
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                "url": "https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4",
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                "name": "https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4"
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                "url": "https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9"
            },
            {
                "url": "https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3",
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                "name": "https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3"
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                "name": "https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6"
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                "name": "https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e"
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                "url": "https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b"
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