{"id":"CVE-2026-98483","summary":"nfc: fix use-after-free in nfc_get_local_general_bytes","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: fix use-after-free in nfc_get_local_general_bytes\n\nCommit 6709d4b7bc2e (\"net: nfc: Fix use-after-free caused by\nnfc_llcp_find_local\") attempted to fix a use-after-free (UAF) issue by\ninvoking nfc_llcp_local_put(local) after accessing local-\u003egb. However,\nif the reference count drops to zero, local is freed immediately,\nleading to a use-after-free when callers access the returned pointer.\nAlternative approaches using dynamic allocation (e.g. kmemdup) introduced\nmemory leaks because callers consistently treat the returned pointer as\nborrowed memory.\n\nFix this properly by refactoring nfc_llcp_general_bytes() and\nnfc_get_local_general_bytes() to accept a caller-provided output buffer\n(out_gb) and its maximum length (gb_max_len). The general bytes are\nsafely copied into out_gb before calling nfc_llcp_local_put(local),\nensuring safe lifetime management without ownership transfer complications.\n\nUpdate all callers across drivers (microread, pn533, pn544, st21nfca,\ndigital_dep, and nci) to provide their own destination buffers and pass\nthem to nfc_get_local_general_bytes().","modified":"2026-10-20T02:30:13.881004388Z","published":"2026-10-18T15:15:57.275Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98483.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/19bcfc2a56d0b82919079b5424c5a9a0ac897dcf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/25bfa673adc70189c0bc872940421ae59f789cf6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2b31d0cc95856c856ada91f943fb14dfdf29a923"},{"type":"WEB","url":"https://git.kernel.org/stable/c/841af260ff477f6191872bc3b2e15488615c1827"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9ede11e12f965ace97c4e0f606667f24fb41e7e1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c40f61a6a413f3eaf028e5fe367fd9749e503ab0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d8c929e9afdbc33b1876ecb97a517e850449b5bd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dcab71a7011918f6fdba7adcec02d217dcb84b8d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98483.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98483"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"96f2c6f272ec04083d828de46285a7d7b17d1aad"},{"fixed":"25bfa673adc70189c0bc872940421ae59f789cf6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"fc8429f8d86801f092fbfbd257c3af821ac0dcd3"},{"fixed":"2b31d0cc95856c856ada91f943fb14dfdf29a923"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"425d9d3a92df7d96b3cfb7ee5c240293a21cbde3"},{"fixed":"c40f61a6a413f3eaf028e5fe367fd9749e503ab0"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6709d4b7bc2e079241fdef15d1160581c5261c10"},{"fixed":"19bcfc2a56d0b82919079b5424c5a9a0ac897dcf"},{"fixed":"d8c929e9afdbc33b1876ecb97a517e850449b5bd"},{"fixed":"841af260ff477f6191872bc3b2e15488615c1827"},{"fixed":"9ede11e12f965ace97c4e0f606667f24fb41e7e1"},{"fixed":"dcab71a7011918f6fdba7adcec02d217dcb84b8d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.188"},{"fixed":"5.10.271"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.121"},{"fixed":"5.15.222"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.39"},{"fixed":"6.1.189"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.251"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.3.13"},{"fixed":"6.4"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.4.4"},{"fixed":"6.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"dd6ff3f3862709ab1a12566e73b9d6a9b8f6e548"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b3ad46e155a6d91b36c6e892019a43e3ef3c696d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e5207c1d69b1a9707615ab6ff9376e59fc096815"}]}],"versions":["v5.10.270","v5.10.269","v5.10.268","v5.10.267","v5.10.266","v5.10.265","v5.10.264","v5.10.263","v5.10.262","v5.10.261","v5.10.260","v5.10.259","v5.10.258","v5.10.257","v5.10.256","v5.10.255","v5.10.254","v5.10.253","v5.10.252","v5.10.251","v5.10.250","v5.10.249","v5.10.248","v5.10.247","v5.10.246","v5.10.245","v5.10.244","v5.10.243","v5.10.242","v5.10.241","v5.10.240","v5.10.239","v5.10.238","v5.10.237","v5.10.236","v5.10.235","v5.10.234","v5.10.233","v5.10.232","v5.10.231","v5.10.230","v5.10.229","v5.10.228","v5.10.227","v5.10.226","v5.10.225","v5.10.224","v5.10.223","v5.10.222","v5.10.221","v5.10.220","v5.10.219","v5.10.218","v5.10.217","v5.10.216","v5.10.215","v5.10.214","v5.10.213","v5.10.212","v5.10.211","v5.10.210","v5.10.209","v5.10.208","v5.10.207","v5.10.206","v5.10.205","v5.10.204","v5.10.203","v5.10.202","v5.10.201","v5.10.200","v5.10.199","v5.10.198","v5.10.197","v5.10.196","v5.10.195","v5.10.194","v5.10.193","v5.10.192","v5.10.191","v5.10.190","v5.10.189","v5.10.188","v5.15.221","v5.15.220","v5.15.219","v5.15.218","v5.15.217","v5.15.216","v5.15.215","v5.15.214","v5.15.213","v5.15.212","v5.15.211","v5.15.210","v5.15.209","v5.15.208","v5.15.207","v5.15.206","v5.15.205","v5.15.204","v5.15.203","v5.15.202","v5.15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