{"id":"CVE-2026-80795","summary":"nfc: nci: fix out-of-bounds write in nci_target_auto_activated()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: fix out-of-bounds write in nci_target_auto_activated()\n\nnci_target_auto_activated() appends a target to the fixed-size array\nndev-\u003etargets[NCI_MAX_DISCOVERED_TARGETS] and increments ndev-\u003en_targets\nwithout first checking the array is full; unlike its sibling\nnci_add_new_target(), which bails out when n_targets already equals\nNCI_MAX_DISCOVERED_TARGETS.\n\nndev-\u003en_targets is only cleared by nci_clear_target_list(), so an NFCC\nthat repeatedly re-runs discovery (RF_DISCOVER_RSP, which re-enters\nNCI_DISCOVERY without clearing the target list) and reports an\nauto-activated target (RF_INTF_ACTIVATED_NTF) drives n_targets past the\nlimit. The append then writes a struct nfc_target past the end of the\narray (a slab out-of-bounds write), and nfc_targets_found() goes on to\nwalk the array with the inflated count:\n\n  BUG: KASAN: slab-out-of-bounds in nci_add_new_protocol+0x94/0x2ac [nci]\n  Write of size 2 at addr ffff0000c7299a18 by task kworker/u8:0/12\n  Workqueue: nfc0_nci_rx_wq nci_rx_work [nci]\n  Call trace:\n   nci_add_new_protocol+0x94/0x2ac [nci]\n   nci_ntf_packet+0xddc/0x11a0 [nci]\n   nci_rx_work+0x15c/0x1e0 [nci]\n   process_one_work+0x2dc/0x500\n   worker_thread+0x240/0x460\n   kthread+0x1c0/0x1d0\n   ret_from_fork+0x10/0x20\n\n  The buggy address belongs to the cache kmalloc-2k of size 2048\n  The buggy address is located 1024 bytes to the right of\n  allocated 1560-byte region [ffff0000c7299000, ffff0000c7299618)\n\nGuard nci_target_auto_activated() with the same check used by\nnci_add_new_target().","modified":"2026-09-06T03:46:46.237687604Z","published":"2026-09-04T15:13:08.640Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80795.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0dc59de0075f88404a0f4a2b5233104ef459fbb2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/129032c0616d83a5e3e304f6ebf88f14ba01e5f7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/24761d3a5f692df5f7d848caeabcb2afd10917aa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2f08dbce3b37624ec6b424d759336a99586170ec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951"},{"type":"WEB","url":"https://git.kernel.org/stable/c/94530ffabfca57e9bff1d207106010014cc84032"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ac200079db50af81e6b04d058b33ec92901d8edd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/afd8605fb43becb892311102844955c3b127fc7e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d7083f41c21b30582e91b2e6de4d54dce74f6f9c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80795.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80795"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5"},{"fixed":"0dc59de0075f88404a0f4a2b5233104ef459fbb2"},{"fixed":"94530ffabfca57e9bff1d207106010014cc84032"},{"fixed":"afd8605fb43becb892311102844955c3b127fc7e"},{"fixed":"24761d3a5f692df5f7d848caeabcb2afd10917aa"},{"fixed":"50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951"},{"fixed":"2f08dbce3b37624ec6b424d759336a99586170ec"},{"fixed":"d7083f41c21b30582e91b2e6de4d54dce74f6f9c"},{"fixed":"129032c0616d83a5e3e304f6ebf88f14ba01e5f7"},{"fixed":"ac200079db50af81e6b04d058b33ec92901d8edd"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80795.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.4.0"},{"fixed":"5.10.267"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.218"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.185"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.154"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.106"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.47"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.11"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80795.json"}}],"schema_version":"1.9.0"}