FKIE_CVE-2021-47549
Vulnerability from fkie_nvd - Published: 2024-05-24 15:15 - Updated: 2026-06-17 04:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl
When the `rmmod sata_fsl.ko` command is executed in the PPC64 GNU/Linux,
a bug is reported:
==================================================================
BUG: Unable to handle kernel data access on read at 0x80000800805b502c
Oops: Kernel access of bad area, sig: 11 [#1]
NIP [c0000000000388a4] .ioread32+0x4/0x20
LR [80000000000c6034] .sata_fsl_port_stop+0x44/0xe0 [sata_fsl]
Call Trace:
.free_irq+0x1c/0x4e0 (unreliable)
.ata_host_stop+0x74/0xd0 [libata]
.release_nodes+0x330/0x3f0
.device_release_driver_internal+0x178/0x2c0
.driver_detach+0x64/0xd0
.bus_remove_driver+0x70/0xf0
.driver_unregister+0x38/0x80
.platform_driver_unregister+0x14/0x30
.fsl_sata_driver_exit+0x18/0xa20 [sata_fsl]
.__se_sys_delete_module+0x1ec/0x2d0
.system_call_exception+0xfc/0x1f0
system_call_common+0xf8/0x200
==================================================================
The triggering of the BUG is shown in the following stack:
driver_detach
device_release_driver_internal
__device_release_driver
drv->remove(dev) --> platform_drv_remove/platform_remove
drv->remove(dev) --> sata_fsl_remove
iounmap(host_priv->hcr_base); <---- unmap
kfree(host_priv); <---- free
devres_release_all
release_nodes
dr->node.release(dev, dr->data) --> ata_host_stop
ap->ops->port_stop(ap) --> sata_fsl_port_stop
ioread32(hcr_base + HCONTROL) <---- UAF
host->ops->host_stop(host)
The iounmap(host_priv->hcr_base) and kfree(host_priv) functions should
not be executed in drv->remove. These functions should be executed in
host_stop after port_stop. Therefore, we move these functions to the
new function sata_fsl_host_stop and bind the new function to host_stop.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.16 | |
| linux | linux_kernel | 5.16 | |
| linux | linux_kernel | 5.16 |
{
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"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "2.6.24"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"version": "4.4.294",
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{
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"version": "4.9.292",
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},
{
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"status": "unaffected",
"version": "4.14.257",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.220",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.164",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.84",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.16",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
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"cveTags": [],
"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-\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."
},
{
"lang": "es",
"value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: sata_fsl: corrige UAF en sata_fsl_port_stop cuando rmmod sata_fsl Cuando se ejecuta el comando `rmmod sata_fsl.ko` en el PPC64 GNU/Linux se reporta un error: ====== ==================================================== ========== ERROR: No se puede manejar el acceso a los datos del kernel al leer en 0x80000800805b502c Ups: Acceso al kernel del \u00e1rea defectuosa, firma: 11 [#1] NIP [c0000000000388a4] .ioread32+0x4/0x20 LR [80000000000c6034 ] .sata_fsl_port_stop+0x44/0xe0 [sata_fsl] Seguimiento de llamadas: .free_irq+0x1c/0x4e0 (no confiable) .ata_host_stop+0x74/0xd0 [libata] .release_nodes+0x330/0x3f0 .device_release_driver_internal+0x178/0x2c0. driver_detach+0x64/0xd0 . bus_remove_driver+0x70/0xf0 .driver_unregister+0x38/0x80 .platform_driver_unregister+0x14/0x30 .fsl_sata_driver_exit+0x18/0xa20 [sata_fsl] .__se_sys_delete_module+0x1ec/0x2d0 .system_call_exception+ 0xfc/0x1f0 system_call_common+0xf8/0x200 ======= ==================================================== ========= La activaci\u00f3n del ERROR se muestra en la siguiente pila: driver_detach device_release_driver_internal __device_release_driver drv-\u0026gt;remove(dev) --\u0026gt; platform_drv_remove/platform_remove drv-\u0026gt;remove(dev) --\u0026gt; sata_fsl_remove iounmap( host_priv-\u0026gt;hcr_base); \u0026lt;---- desasignar kfree(host_priv); \u0026lt;---- free devres_release_all release_nodes dr-\u0026gt;node.release(dev, dr-\u0026gt;data) --\u0026gt; ata_host_stop ap-\u0026gt;ops-\u0026gt;port_stop(ap) --\u0026gt; sata_fsl_port_stop ioread32(hcr_base + HCONTROL) \u0026lt;--- - UAF host-\u0026gt;ops-\u0026gt;host_stop(host) Las funciones iounmap(host_priv-\u0026gt;hcr_base) y kfree(host_priv) no deben ejecutarse en drv-\u0026gt;remove. Estas funciones deben ejecutarse en host_stop despu\u00e9s de port_stop. Por lo tanto, movemos estas funciones a la nueva funci\u00f3n sata_fsl_host_stop y vinculamos la nueva funci\u00f3n a host_stop."
}
],
"id": "CVE-2021-47549",
"lastModified": "2026-06-17T04:17:44.597",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-47549",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-06-10T18:51:57.611443Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-05-24T15:15:19.773",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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