Vulnerability-Lookup

FKIE_CVE-2021-47068

Vulnerability from fkie_nvd - Published: 2024-02-29 23:15 - Updated: 2026-06-17 04:16

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c	Patch

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	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "26157c82ba756767b2bd66d28a71b1bc454447f6",
              "status": "affected",
              "version": "a1cdd18c49d23ec38097ac2c5b0d761146fc0109",
              "versionType": "git"
            },
            {
              "lessThan": "ccddad6dd28530e716448e594c9ca7c76ccd0570",
              "status": "affected",
              "version": "18013007b596771bf5f5e7feee9586fb0386ad14",
              "versionType": "git"
            },
            {
              "lessThan": "18ae4a192a4496e48a5490b52812645d2413307c",
              "status": "affected",
              "version": "538a6ff11516d38a61e237d2d2dc04c30c845fbe",
              "versionType": "git"
            },
            {
              "lessThan": "48fba458fe54cc2a980a05c13e6c19b8b2cfb610",
              "status": "affected",
              "version": "adbb1d218c5f56dbae052765da83c0f57fce2a31",
              "versionType": "git"
            },
            {
              "lessThan": "e32352070bcac22be6ed8ab635debc280bb65b8c",
              "status": "affected",
              "version": "c89903c9eff219a4695e63715cf922748d743f65",
              "versionType": "git"
            },
            {
              "lessThan": "6b7021ed36dabf29e56842e3408781cd3b82ef6e",
              "status": "affected",
              "version": "6fb003e5ae18d8cda4c8a1175d9dd8db12bec049",
              "versionType": "git"
            },
            {
              "lessThan": "374cdde4dcc9c909a60713abdbbf96d5e3e09f91",
              "status": "affected",
              "version": "8c9e4971e142e2899606a2490b77a1208c1f4638",
              "versionType": "git"
            },
            {
              "lessThan": "18175fe17ae043a0b81e5d511f8817825784c299",
              "status": "affected",
              "version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
              "versionType": "git"
            },
            {
              "lessThan": "c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6",
              "status": "affected",
              "version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
              "versionType": "git"
            },
            {
              "lessThan": "4.4.269",
              "status": "affected",
              "version": "4.4.267",
              "versionType": "semver"
            },
            {
              "lessThan": "4.9.269",
              "status": "affected",
              "version": "4.9.267",
              "versionType": "semver"
            },
            {
              "lessThan": "4.14.233",
              "status": "affected",
              "version": "4.14.231",
              "versionType": "semver"
            },
            {
              "lessThan": "4.19.191",
              "status": "affected",
              "version": "4.19.187",
              "versionType": "semver"
            },
            {
              "lessThan": "5.4.119",
              "status": "affected",
              "version": "5.4.112",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10.37",
              "status": "affected",
              "version": "5.10.30",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11.21",
              "status": "affected",
              "version": "5.11.14",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.233",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.119",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.37",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.11.*",
              "status": "unaffected",
              "version": "5.11.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3F56FA3D-5B9E-455D-BA98-AAD5E4B15FDB",
              "versionEndExcluding": "4.4.269",
              "versionStartIncluding": "4.4.267",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B10FBDD9-624C-4294-AB93-D37D5CC2A04B",
              "versionEndExcluding": "4.9.269",
              "versionStartIncluding": "4.9.267",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "60A4360B-1370-4097-A160-B99742C3235F",
              "versionEndExcluding": "4.14.233",
              "versionStartIncluding": "4.14.231",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "884C2D43-91AB-4AB0-88F9-2DB0A7208D3B",
              "versionEndExcluding": "4.19.191",
              "versionStartIncluding": "4.19.187",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0A06D523-CBB3-4DF4-BCF1-5508C3DB89D9",
              "versionEndExcluding": "5.4.119",
              "versionStartIncluding": "5.4.112",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2D7B8DC6-CB38-4A86-8EC5-C0803B42FC8A",
              "versionEndExcluding": "5.10.37",
              "versionStartIncluding": "5.10.30",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D0E4DE1B-ADA6-4853-BFAB-67C97C59255F",
              "versionEndExcluding": "5.11.21",
              "versionStartIncluding": "5.11.14",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D8C7052F-1B7B-4327-9C2B-84EBF3243838",
              "versionEndExcluding": "5.12.4",
              "versionStartIncluding": "5.12",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "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": "2026-06-17T04:16:22.493",
  "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"
      },
      {
        "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47068",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-04-22T15:46:55.659814Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-02-29T23:15:08.170",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

CVE-2021-47068 (GCVE-0-2021-47068)

Vulnerability from cvelistv5 – Published: 2024-02-29 22:37 – Updated: 2026-08-05 08:45

Title

net/nfc: fix use-after-free llcp_sock_bind/connect

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-22 15:46 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root Scorecard

References

9 references

URL	Tags
https://git.kernel.org/stable/c/26157c82ba756767b…
https://git.kernel.org/stable/c/ccddad6dd28530e71…
https://git.kernel.org/stable/c/18ae4a192a4496e48…
https://git.kernel.org/stable/c/48fba458fe54cc2a9…
https://git.kernel.org/stable/c/e32352070bcac22be…
https://git.kernel.org/stable/c/6b7021ed36dabf29e…
https://git.kernel.org/stable/c/374cdde4dcc9c909a…
https://git.kernel.org/stable/c/18175fe17ae043a0b…
https://git.kernel.org/stable/c/c61760e6940dd4039…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a1cdd18c49d23ec38097ac2c5b0d761146fc0109 , < 26157c82ba756767b2bd66d28a71b1bc454447f6 (git) Affected: 18013007b596771bf5f5e7feee9586fb0386ad14 , < ccddad6dd28530e716448e594c9ca7c76ccd0570 (git) Affected: 538a6ff11516d38a61e237d2d2dc04c30c845fbe , < 18ae4a192a4496e48a5490b52812645d2413307c (git) Affected: adbb1d218c5f56dbae052765da83c0f57fce2a31 , < 48fba458fe54cc2a980a05c13e6c19b8b2cfb610 (git) Affected: c89903c9eff219a4695e63715cf922748d743f65 , < e32352070bcac22be6ed8ab635debc280bb65b8c (git) Affected: 6fb003e5ae18d8cda4c8a1175d9dd8db12bec049 , < 6b7021ed36dabf29e56842e3408781cd3b82ef6e (git) Affected: 8c9e4971e142e2899606a2490b77a1208c1f4638 , < 374cdde4dcc9c909a60713abdbbf96d5e3e09f91 (git) Affected: c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d , < 18175fe17ae043a0b81e5d511f8817825784c299 (git) Affected: c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d , < c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6 (git) Affected: 4.4.267 , < 4.4.269 (semver) Affected: 4.9.267 , < 4.9.269 (semver) Affected: 4.14.231 , < 4.14.233 (semver) Affected: 4.19.187 , < 4.19.191 (semver) Affected: 5.4.112 , < 5.4.119 (semver) Affected: 5.10.30 , < 5.10.37 (semver) Affected: 5.11.14 , < 5.11.21 (semver)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 4.4.269 , ≤ 4.4.* (semver) Unaffected: 4.9.269 , ≤ 4.9.* (semver) Unaffected: 4.14.233 , ≤ 4.14.* (semver) Unaffected: 4.19.191 , ≤ 4.19.* (semver) Unaffected: 5.4.119 , ≤ 5.4.* (semver) Unaffected: 5.10.37 , ≤ 5.10.* (semver) Unaffected: 5.11.21 , ≤ 5.11.* (semver) Unaffected: 5.12.4 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-47068",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-22T15:46:55.659814Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-22T15:47:46.766Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:24:39.447Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "26157c82ba756767b2bd66d28a71b1bc454447f6",
              "status": "affected",
              "version": "a1cdd18c49d23ec38097ac2c5b0d761146fc0109",
              "versionType": "git"
            },
            {
              "lessThan": "ccddad6dd28530e716448e594c9ca7c76ccd0570",
              "status": "affected",
              "version": "18013007b596771bf5f5e7feee9586fb0386ad14",
              "versionType": "git"
            },
            {
              "lessThan": "18ae4a192a4496e48a5490b52812645d2413307c",
              "status": "affected",
              "version": "538a6ff11516d38a61e237d2d2dc04c30c845fbe",
              "versionType": "git"
            },
            {
              "lessThan": "48fba458fe54cc2a980a05c13e6c19b8b2cfb610",
              "status": "affected",
              "version": "adbb1d218c5f56dbae052765da83c0f57fce2a31",
              "versionType": "git"
            },
            {
              "lessThan": "e32352070bcac22be6ed8ab635debc280bb65b8c",
              "status": "affected",
              "version": "c89903c9eff219a4695e63715cf922748d743f65",
              "versionType": "git"
            },
            {
              "lessThan": "6b7021ed36dabf29e56842e3408781cd3b82ef6e",
              "status": "affected",
              "version": "6fb003e5ae18d8cda4c8a1175d9dd8db12bec049",
              "versionType": "git"
            },
            {
              "lessThan": "374cdde4dcc9c909a60713abdbbf96d5e3e09f91",
              "status": "affected",
              "version": "8c9e4971e142e2899606a2490b77a1208c1f4638",
              "versionType": "git"
            },
            {
              "lessThan": "18175fe17ae043a0b81e5d511f8817825784c299",
              "status": "affected",
              "version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
              "versionType": "git"
            },
            {
              "lessThan": "c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6",
              "status": "affected",
              "version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
              "versionType": "git"
            },
            {
              "lessThan": "4.4.269",
              "status": "affected",
              "version": "4.4.267",
              "versionType": "semver"
            },
            {
              "lessThan": "4.9.269",
              "status": "affected",
              "version": "4.9.267",
              "versionType": "semver"
            },
            {
              "lessThan": "4.14.233",
              "status": "affected",
              "version": "4.14.231",
              "versionType": "semver"
            },
            {
              "lessThan": "4.19.191",
              "status": "affected",
              "version": "4.19.187",
              "versionType": "semver"
            },
            {
              "lessThan": "5.4.119",
              "status": "affected",
              "version": "5.4.112",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10.37",
              "status": "affected",
              "version": "5.10.30",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11.21",
              "status": "affected",
              "version": "5.11.14",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.233",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.119",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.37",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.11.*",
              "status": "unaffected",
              "version": "5.11.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.4.269",
                  "versionStartIncluding": "4.4.267",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.269",
                  "versionStartIncluding": "4.9.267",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.233",
                  "versionStartIncluding": "4.14.231",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.191",
                  "versionStartIncluding": "4.19.187",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.119",
                  "versionStartIncluding": "5.4.112",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.37",
                  "versionStartIncluding": "5.10.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.11.21",
                  "versionStartIncluding": "5.11.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.4",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached via local AF_NFC SOCK_STREAM socket/bind/close syscalls on the LLCP path, not by processing NFC frames from a peer; an NFC device must exist but the trigger itself is local userspace.\nAC:L - The PoC is deterministic with no race: two binds that fail after assigning the shared local, then close, reliably free and re-use the object under full attacker control of both sockets and timing for heap spray.\nPR:L - SOCK_STREAM/DGRAM LLCP sockets require no capabilities (only SOCK_RAW checks CAP_NET_RAW); an unprivileged local user can trigger this on a system with an NFC device (e.g., Android/phone), matching the researchers\u0027 unprivileged LPE claim.\nUI:N - The attacker runs their own program to create sockets, bind, and close; no victim interaction is required.\nS:U - This is a standard in-kernel UAF privilege escalation within the host kernel\u0027s security authority, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Use-after-free of the heap-allocated nfc_llcp_local object enables reclaim and arbitrary read primitives, supporting full confidentiality impact and privilege escalation.\nI:H - The same UAF provides a write primitive via controlled reclaim of the freed local object, enabling corruption/control-flow hijacking and privilege escalation as reported.\nA:H - The UAF causes refcount underflow, kernel warnings/oops, and crash on misuse of the freed local, so availability impact is high even without a full exploit."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:45:49.592Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570"
        },
        {
          "url": "https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c"
        },
        {
          "url": "https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610"
        },
        {
          "url": "https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91"
        },
        {
          "url": "https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299"
        },
        {
          "url": "https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6"
        }
      ],
      "title": "net/nfc: fix use-after-free llcp_sock_bind/connect",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47068",
    "datePublished": "2024-02-29T22:37:41.736Z",
    "dateReserved": "2024-02-29T22:33:44.296Z",
    "dateUpdated": "2026-08-05T08:45:49.592Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

FKIE_CVE-2021-47068

CVE-2021-47068 (GCVE-0-2021-47068)

Tags

Sightings

Nomenclature

Related by attack behaviour