{"id":"CVE-2021-47549","details":"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-\u003eremove(dev) --\u003e platform_drv_remove/platform_remove\n        drv-\u003eremove(dev) --\u003e sata_fsl_remove\n          iounmap(host_priv-\u003ehcr_base);\t\t\t\u003c---- unmap\n          kfree(host_priv);                             \u003c---- free\n      devres_release_all\n        release_nodes\n          dr-\u003enode.release(dev, dr-\u003edata) --\u003e ata_host_stop\n            ap-\u003eops-\u003eport_stop(ap) --\u003e sata_fsl_port_stop\n                ioread32(hcr_base + HCONTROL)           \u003c---- UAF\n            host-\u003eops-\u003ehost_stop(host)\n\nThe iounmap(host_priv-\u003ehcr_base) and kfree(host_priv) functions should\nnot be executed in drv-\u003eremove. 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.","modified":"2026-03-13T05:20:47.590240Z","published":"2024-05-24T15:15:19.773Z","related":["SUSE-SU-2024:2008-1","SUSE-SU-2024:2010-1","SUSE-SU-2024:2011-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2185-1","SUSE-SU-2024:2189-1","SUSE-SU-2024:2190-1","SUSE-SU-2024:3189-1","SUSE-SU-2024:3251-1","SUSE-SU-2024:3252-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/adf098e2a8a1e1fc075d6a5ba2edd13cf7189082"},{"type":"FIX","url":"https://git.kernel.org/stable/c/cdcd80292106df5cda325426e96495503e41f947"},{"type":"FIX","url":"https://git.kernel.org/stable/c/0769449b0a5eabc3545337217ae690e46673e73a"},{"type":"FIX","url":"https://git.kernel.org/stable/c/325ea49fc43cbc03a5e1e37de8f0ca6357ced4b1"},{"type":"FIX","url":"https://git.kernel.org/stable/c/4a46b2f5dce02539e88a300800812bd24a45e097"},{"type":"FIX","url":"https://git.kernel.org/stable/c/6c8ad7e8cf29eb55836e7a0215f967746ab2b504"},{"type":"FIX","url":"https://git.kernel.org/stable/c/77393806c76b6b44f1c44bd957788c8bd9152c45"},{"type":"FIX","url":"https://git.kernel.org/stable/c/91ba94d3f7afca195b224f77a72044fbde1389ce"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"2.6.24"},{"fixed":"4.4.294"}]},{"events":[{"introduced":"4.5"},{"fixed":"4.9.292"}]},{"events":[{"introduced":"4.10"},{"fixed":"4.14.257"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.220"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.164"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.84"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.15.7"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-rc3"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47549.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}