fkie_cve-2021-47012
Vulnerability from fkie_nvd
Published
2024-02-28 09:15
Modified
2024-12-09 18:24
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2021-47012",
  "lastModified": "2024-12-09T18:24:59.420",
  "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"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-02-28T09:15:38.753",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-416"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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