{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47068","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-29T22:33:44.296Z","datePublished":"2024-02-29T22:37:41.736Z","dateUpdated":"2025-05-04T07:03:32.020Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:03:32.020Z"},"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( &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->local after calling\nnfc_llcp_local_put.\n\nThis addresses CVE-2021-23134."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_sock.c"],"versions":[{"version":"a1cdd18c49d23ec38097ac2c5b0d761146fc0109","lessThan":"26157c82ba756767b2bd66d28a71b1bc454447f6","status":"affected","versionType":"git"},{"version":"18013007b596771bf5f5e7feee9586fb0386ad14","lessThan":"ccddad6dd28530e716448e594c9ca7c76ccd0570","status":"affected","versionType":"git"},{"version":"538a6ff11516d38a61e237d2d2dc04c30c845fbe","lessThan":"18ae4a192a4496e48a5490b52812645d2413307c","status":"affected","versionType":"git"},{"version":"adbb1d218c5f56dbae052765da83c0f57fce2a31","lessThan":"48fba458fe54cc2a980a05c13e6c19b8b2cfb610","status":"affected","versionType":"git"},{"version":"c89903c9eff219a4695e63715cf922748d743f65","lessThan":"e32352070bcac22be6ed8ab635debc280bb65b8c","status":"affected","versionType":"git"},{"version":"6fb003e5ae18d8cda4c8a1175d9dd8db12bec049","lessThan":"6b7021ed36dabf29e56842e3408781cd3b82ef6e","status":"affected","versionType":"git"},{"version":"8c9e4971e142e2899606a2490b77a1208c1f4638","lessThan":"374cdde4dcc9c909a60713abdbbf96d5e3e09f91","status":"affected","versionType":"git"},{"version":"c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d","lessThan":"18175fe17ae043a0b81e5d511f8817825784c299","status":"affected","versionType":"git"},{"version":"c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d","lessThan":"c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_sock.c"],"versions":[{"version":"5.12","status":"affected"},{"version":"0","lessThan":"5.12","status":"unaffected","versionType":"semver"},{"version":"4.4.269","lessThanOrEqual":"4.4.*","status":"unaffected","versionType":"semver"},{"version":"4.9.269","lessThanOrEqual":"4.9.*","status":"unaffected","versionType":"semver"},{"version":"4.14.233","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.191","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.119","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.37","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.11.21","lessThanOrEqual":"5.11.*","status":"unaffected","versionType":"semver"},{"version":"5.12.4","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4.267","versionEndExcluding":"4.4.269"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9.267","versionEndExcluding":"4.9.269"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.231","versionEndExcluding":"4.14.233"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.187","versionEndExcluding":"4.19.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.112","versionEndExcluding":"5.4.119"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.30","versionEndExcluding":"5.10.37"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11.14","versionEndExcluding":"5.11.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.12.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.13"}]}]}],"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: 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