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vuln-cve/data/2021/47xxx/CVE-2021-47549.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2021-47549",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-05-24T15:02:54.831Z",
"datePublished": "2024-05-24T15:09:53.292Z",
"dateUpdated": "2026-05-11T13:56:46.684Z"
},
"containers": {
"cna": {
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"shortName": "Linux",
"dateUpdated": "2026-05-11T13:56:46.684Z"
},
"descriptions": [
{
"lang": "en",
"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."
}
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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