{"id":"CVE-2021-47068","details":"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( &addr, 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*) &addr, sizeof(struct sockaddr_nfc_llcp) )\n    bind( sock2, (struct sockaddr*) &addr, 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.","modified":"2026-03-15T22:42:47.073572Z","published":"2024-02-29T23:15:08.170Z","related":["SUSE-SU-2024:1454-1","SUSE-SU-2024:1465-1","SUSE-SU-2024:1489-1","SUSE-SU-2024:1643-1","SUSE-SU-2024:1646-1","SUSE-SU-2024:1870-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299"},{"type":"FIX","url":"https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c"},{"type":"FIX","url":"https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610"},{"type":"FIX","url":"https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570"},{"type":"FIX","url":"https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c"},{"type":"FIX","url":"https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6"},{"type":"FIX","url":"https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91"},{"type":"FIX","url":"https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"4.4.267"},{"fixed":"4.4.269"}]},{"events":[{"introduced":"4.9.267"},{"fixed":"4.9.269"}]},{"events":[{"introduced":"4.14.231"},{"fixed":"4.14.233"}]},{"events":[{"introduced":"4.19.187"},{"fixed":"4.19.191"}]},{"events":[{"introduced":"5.4.112"},{"fixed":"5.4.119"}]},{"events":[{"introduced":"5.10.30"},{"fixed":"5.10.37"}]},{"events":[{"introduced":"5.11.14"},{"fixed":"5.11.21"}]},{"events":[{"introduced":"5.12"},{"fixed":"5.12.4"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47068.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}