cve-2021-47012
Vulnerability from cvelistv5
Published
2024-02-28 08:13
Modified
2024-11-04 11:57
Severity ?
EPSS score ?
Summary
RDMA/siw: Fix a use after free in siw_alloc_mr
References
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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."
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"nvd": "{\"cve\":{\"id\":\"CVE-2021-47012\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-28T09:15:38.753\",\"lastModified\":\"2024-02-28T14:06:45.783\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: RDMA/siw: Corrige un use after free en siw_alloc_mr Nuestro analizador de c\u00f3digo inform\u00f3 un UAF. En siw_alloc_mr(), llama a siw_mr_add_mem(mr,..). En la implementaci\u00f3n de siw_mr_add_mem(), mem se asigna a mr-\u0026gt;mem y luego mem se libera mediante kfree(mem) si xa_alloc_ciclic() falla. Aqu\u00ed, mr-\u0026gt;mem todav\u00eda apunta a un objeto liberado. Despu\u00e9s, la ejecuci\u00f3n contin\u00faa hasta la rama err_out de siw_alloc_mr, y el mr-\u0026gt;mem liberado se usa en siw_mr_drop_mem(mr). Mi parche mueve \\\"mr-\u0026gt;mem = mem\\\" detr\u00e1s de la secci\u00f3n if (xa_alloc_ciclic(..)\u0026lt;0) {}, para evitar el uaf.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Patched: This vulnerability was successfully patched by the user reporting the sighting.
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- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.