gsd-2021-47012
Vulnerability from gsd
Modified
2024-02-28 06:03
Details
In the Linux kernel, the following vulnerability has been resolved:
RDMA/siw: Fix a use after free in siw_alloc_mr
Our code analyzer reported a UAF.
In siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of
siw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via
kfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a
freed object. After, the execution continue up to the err_out branch of
siw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr).
My patch moves "mr->mem = mem" behind the if (xa_alloc_cyclic(..)<0) {}
section, to avoid the uaf.
Aliases
{
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-47012"
],
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Fix a use after free in siw_alloc_mr\n\nOur code analyzer reported a UAF.\n\nIn siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of\nsiw_mr_add_mem(), mem is assigned to mr-\u003emem and then mem is freed via\nkfree(mem) if xa_alloc_cyclic() failed. Here, mr-\u003emem still point to a\nfreed object. After, the execution continue up to the err_out branch of\nsiw_alloc_mr, and the freed mr-\u003emem is used in siw_mr_drop_mem(mr).\n\nMy patch moves \"mr-\u003emem = mem\" behind the if (xa_alloc_cyclic(..)\u003c0) {}\nsection, to avoid the uaf.",
"id": "GSD-2021-47012",
"modified": "2024-02-28T06:03:55.894825Z",
"schema_version": "1.4.0"
}
},
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"STATE": "PUBLIC"
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"affects": {
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"product": {
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"product_name": "Linux",
"version": {
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"version_affected": "\u003c",
"version_name": "2251334dcac9",
"version_value": "30b9e92d0b5e"
},
{
"version_value": "not down converted",
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"version": "5.4.119",
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"version": "5.10.37",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Fix a use after free in siw_alloc_mr\n\nOur code analyzer reported a UAF.\n\nIn siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of\nsiw_mr_add_mem(), mem is assigned to mr-\u003emem and then mem is freed via\nkfree(mem) if xa_alloc_cyclic() failed. Here, mr-\u003emem still point to a\nfreed object. After, the execution continue up to the err_out branch of\nsiw_alloc_mr, and the freed mr-\u003emem is used in siw_mr_drop_mem(mr).\n\nMy patch moves \"mr-\u003emem = mem\" behind the if (xa_alloc_cyclic(..)\u003c0) {}\nsection, to avoid the uaf."
}
],
"id": "CVE-2021-47012",
"lastModified": "2024-02-28T14:06:45.783",
"metrics": {},
"published": "2024-02-28T09:15:38.753",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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