fkie_cve-2021-47068
Vulnerability from fkie_nvd
Published
2024-02-29 23:15
Modified
2025-04-22 16:15
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: net/nfc: fix use-after-free llcp_sock_bind/connect Commits 8a4cd82d ("nfc: fix refcount leak in llcp_sock_connect()") and c33b1cc62 ("nfc: fix refcount leak in llcp_sock_bind()") fixed a refcount leak bug in bind/connect but introduced a use-after-free if the same local is assigned to 2 different sockets. This can be triggered by the following simple program: int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); memset( &addr, 0, sizeof(struct sockaddr_nfc_llcp) ); addr.sa_family = AF_NFC; addr.nfc_protocol = NFC_PROTO_NFC_DEP; bind( sock1, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) ) bind( sock2, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) ) close(sock1); close(sock2); Fix this by assigning NULL to llcp_sock->local after calling nfc_llcp_local_put. This addresses CVE-2021-23134.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8cPatch
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 *


To clipboard 

{
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          "negate": false,
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/nfc: fix use-after-free llcp_sock_bind/connect\n\nCommits 8a4cd82d (\"nfc: fix refcount leak in llcp_sock_connect()\")\nand c33b1cc62 (\"nfc: fix refcount leak in llcp_sock_bind()\")\nfixed a refcount leak bug in bind/connect but introduced a\nuse-after-free if the same local is assigned to 2 different sockets.\n\nThis can be triggered by the following simple program:\n    int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\n    int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\n    memset( \u0026addr, 0, sizeof(struct sockaddr_nfc_llcp) );\n    addr.sa_family = AF_NFC;\n    addr.nfc_protocol = NFC_PROTO_NFC_DEP;\n    bind( sock1, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\n    bind( sock2, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\n    close(sock1);\n    close(sock2);\n\nFix this by assigning NULL to llcp_sock-\u003elocal after calling\nnfc_llcp_local_put.\n\nThis addresses CVE-2021-23134."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/nfc: corrige use-after-free llcp_sock_bind/connect Commits 8a4cd82d (\"nfc: corrige la fuga de refcount en llcp_sock_connect()\") y c33b1cc62 (\"nfc: corrige la fuga de refcount en llcp_sock_bind()\") corrigi\u00f3 un error de fuga de recuento en bind/connect pero introdujo un Use-After-Free si el mismo local est\u00e1 asignado a 2 sockets diferentes. Esto puede activarse mediante el siguiente programa simple: int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); int sock2 = conector (AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP); memset( \u0026amp;addr, 0, sizeof(struct sockaddr_nfc_llcp) ); addr.sa_family = AF_NFC; addr.nfc_protocol = NFC_PROTO_NFC_DEP; bind( sock1, (struct sockaddr*) \u0026amp; addr, sizeof(struct sockaddr_nfc_llcp) ) bind( sock2, (struct sockaddr*) \u0026amp; addr, sizeof(struct sockaddr_nfc_llcp) ) close(sock1); cerrar(calcet\u00edn2); Solucione este problema asignando NULL a llcp_sock-\u0026gt;local despu\u00e9s de llamar a nfc_llcp_local_put. Esto aborda CVE-2021-23134."
    }
  ],
  "id": "CVE-2021-47068",
  "lastModified": "2025-04-22T16:15:20.727",
  "metrics": {
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          "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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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
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          "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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        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2024-02-29T23:15:08.170",
  "references": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
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          "value": "CWE-416"
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}


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