CVE-2021-47068 (GCVE-0-2021-47068)
Vulnerability from cvelistv5
Published
2024-02-29 22:37
Modified
2026-08-05 08:45
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: 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
Impacted products
Vendor Product Version
Linux Linux Version: a1cdd18c49d23ec38097ac2c5b0d761146fc0109
Version: 18013007b596771bf5f5e7feee9586fb0386ad14
Version: 538a6ff11516d38a61e237d2d2dc04c30c845fbe
Version: adbb1d218c5f56dbae052765da83c0f57fce2a31
Version: c89903c9eff219a4695e63715cf922748d743f65
Version: 6fb003e5ae18d8cda4c8a1175d9dd8db12bec049
Version: 8c9e4971e142e2899606a2490b77a1208c1f4638
Version: c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d
Version: c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d
Version: 4.4.267   ≤
Version: 4.9.267   ≤
Version: 4.14.231   ≤
Version: 4.19.187   ≤
Version: 5.4.112   ≤
Version: 5.10.30   ≤
Version: 5.11.14   ≤
Create a notification for this product.
Show details on NVD website

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",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"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\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:24:39.447Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47068\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-04-22T15:46:55.659814Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:16.061Z\"}}], \"cna\": {\"title\": \"net/nfc: fix use-after-free llcp_sock_bind/connect\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a1cdd18c49d23ec38097ac2c5b0d761146fc0109\", \"lessThan\": \"26157c82ba756767b2bd66d28a71b1bc454447f6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"18013007b596771bf5f5e7feee9586fb0386ad14\", \"lessThan\": \"ccddad6dd28530e716448e594c9ca7c76ccd0570\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"538a6ff11516d38a61e237d2d2dc04c30c845fbe\", \"lessThan\": \"18ae4a192a4496e48a5490b52812645d2413307c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"adbb1d218c5f56dbae052765da83c0f57fce2a31\", \"lessThan\": \"48fba458fe54cc2a980a05c13e6c19b8b2cfb610\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c89903c9eff219a4695e63715cf922748d743f65\", \"lessThan\": \"e32352070bcac22be6ed8ab635debc280bb65b8c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6fb003e5ae18d8cda4c8a1175d9dd8db12bec049\", \"lessThan\": \"6b7021ed36dabf29e56842e3408781cd3b82ef6e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8c9e4971e142e2899606a2490b77a1208c1f4638\", \"lessThan\": \"374cdde4dcc9c909a60713abdbbf96d5e3e09f91\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d\", \"lessThan\": \"18175fe17ae043a0b81e5d511f8817825784c299\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d\", \"lessThan\": \"c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.4.267\", \"lessThan\": \"4.4.269\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.9.267\", \"lessThan\": \"4.9.269\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.14.231\", \"lessThan\": \"4.14.233\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.187\", \"lessThan\": \"4.19.191\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.112\", \"lessThan\": \"5.4.119\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.10.30\", \"lessThan\": \"5.10.37\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.11.14\", \"lessThan\": \"5.11.21\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/nfc/llcp_sock.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.269\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.269\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.233\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.191\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.119\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.37\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/nfc/llcp_sock.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.269\", \"versionStartIncluding\": \"4.4.267\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.269\", \"versionStartIncluding\": \"4.9.267\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.233\", \"versionStartIncluding\": \"4.14.231\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.19.187\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.119\", \"versionStartIncluding\": \"5.4.112\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.37\", \"versionStartIncluding\": \"5.10.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.21\", \"versionStartIncluding\": \"5.11.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.4\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:45:49.592Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47068\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:45:49.592Z\", \"dateReserved\": \"2024-02-29T22:33:44.296Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-29T22:37:41.736Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • 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.