{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-47549",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl\n\nWhen the `rmmod sata_fsl.ko` command is executed in the PPC64 GNU/Linux,\na bug is reported:\n ==================================================================\n BUG: Unable to handle kernel data access on read at 0x80000800805b502c\n Oops: Kernel access of bad area, sig: 11 [#1]\n NIP [c0000000000388a4] .ioread32+0x4/0x20\n LR [80000000000c6034] .sata_fsl_port_stop+0x44/0xe0 [sata_fsl]\n Call Trace:\n  .free_irq+0x1c/0x4e0 (unreliable)\n  .ata_host_stop+0x74/0xd0 [libata]\n  .release_nodes+0x330/0x3f0\n  .device_release_driver_internal+0x178/0x2c0\n  .driver_detach+0x64/0xd0\n  .bus_remove_driver+0x70/0xf0\n  .driver_unregister+0x38/0x80\n  .platform_driver_unregister+0x14/0x30\n  .fsl_sata_driver_exit+0x18/0xa20 [sata_fsl]\n  .__se_sys_delete_module+0x1ec/0x2d0\n  .system_call_exception+0xfc/0x1f0\n  system_call_common+0xf8/0x200\n ==================================================================\n\nThe triggering of the BUG is shown in the following stack:\n\ndriver_detach\n  device_release_driver_internal\n    __device_release_driver\n      drv->remove(dev) --> platform_drv_remove/platform_remove\n        drv->remove(dev) --> sata_fsl_remove\n          iounmap(host_priv->hcr_base);\t\t\t<---- unmap\n          kfree(host_priv);                             <---- free\n      devres_release_all\n        release_nodes\n          dr->node.release(dev, dr->data) --> ata_host_stop\n            ap->ops->port_stop(ap) --> sata_fsl_port_stop\n                ioread32(hcr_base + HCONTROL)           <---- UAF\n            host->ops->host_stop(host)\n\nThe iounmap(host_priv->hcr_base) and kfree(host_priv) functions should\nnot be executed in drv->remove. These functions should be executed in\nhost_stop after port_stop. Therefore, we move these functions to the\nnew function sata_fsl_host_stop and bind the new function to host_stop."
            }
        ]
    },
    "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": "faf0b2e5afe7",
                                            "version_value": "cdcd80292106"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "2.6.24",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "2.6.24",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "4.4.294",
                                                        "lessThanOrEqual": "4.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "4.9.292",
                                                        "lessThanOrEqual": "4.9.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "4.14.257",
                                                        "lessThanOrEqual": "4.14.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "4.19.220",
                                                        "lessThanOrEqual": "4.19.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.4.164",
                                                        "lessThanOrEqual": "5.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.10.84",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.15.7",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.16",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
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                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/cdcd80292106df5cda325426e96495503e41f947",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/cdcd80292106df5cda325426e96495503e41f947"
            },
            {
                "url": "https://git.kernel.org/stable/c/91ba94d3f7afca195b224f77a72044fbde1389ce",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/91ba94d3f7afca195b224f77a72044fbde1389ce"
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                "url": "https://git.kernel.org/stable/c/325ea49fc43cbc03a5e1e37de8f0ca6357ced4b1",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/325ea49fc43cbc03a5e1e37de8f0ca6357ced4b1"
            },
            {
                "url": "https://git.kernel.org/stable/c/0769449b0a5eabc3545337217ae690e46673e73a",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/0769449b0a5eabc3545337217ae690e46673e73a"
            },
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                "url": "https://git.kernel.org/stable/c/77393806c76b6b44f1c44bd957788c8bd9152c45",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/77393806c76b6b44f1c44bd957788c8bd9152c45"
            },
            {
                "url": "https://git.kernel.org/stable/c/4a46b2f5dce02539e88a300800812bd24a45e097",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/4a46b2f5dce02539e88a300800812bd24a45e097"
            },
            {
                "url": "https://git.kernel.org/stable/c/adf098e2a8a1e1fc075d6a5ba2edd13cf7189082",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/adf098e2a8a1e1fc075d6a5ba2edd13cf7189082"
            },
            {
                "url": "https://git.kernel.org/stable/c/6c8ad7e8cf29eb55836e7a0215f967746ab2b504",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/6c8ad7e8cf29eb55836e7a0215f967746ab2b504"
            }
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