{"id":"CVE-2026-80795","title":"nfc: nci: fix out-of-bounds write in nci_target_auto_activated()","summary":"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->targets[NCI_MAX_DISCOVERED_…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 0dc59de0075f88404a0f4a2b5233104ef459fbb2","Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 94530ffabfca57e9bff1d207106010014cc84032","Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < afd8605fb43becb892311102844955c3b127fc7e","Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 24761d3a5f692df5f7d848caeabcb2afd10917aa","Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951","Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 2f08dbce3b37624ec6b424d759336a99586170ec","Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < d7083f41c21b30582e91b2e6de4d54dce74f6f9c","Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 129032c0616d83a5e3e304f6ebf88f14ba01e5f7","Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < ac200079db50af81e6b04d058b33ec92901d8edd","Linux 3.4"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:43:48.491Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80795","references":[{"url":"https://git.kernel.org/stable/c/0dc59de0075f88404a0f4a2b5233104ef459fbb2"},{"url":"https://git.kernel.org/stable/c/94530ffabfca57e9bff1d207106010014cc84032"},{"url":"https://git.kernel.org/stable/c/afd8605fb43becb892311102844955c3b127fc7e"},{"url":"https://git.kernel.org/stable/c/24761d3a5f692df5f7d848caeabcb2afd10917aa"},{"url":"https://git.kernel.org/stable/c/50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951"},{"url":"https://git.kernel.org/stable/c/2f08dbce3b37624ec6b424d759336a99586170ec"},{"url":"https://git.kernel.org/stable/c/d7083f41c21b30582e91b2e6de4d54dce74f6f9c"},{"url":"https://git.kernel.org/stable/c/129032c0616d83a5e3e304f6ebf88f14ba01e5f7"},{"url":"https://git.kernel.org/stable/c/ac200079db50af81e6b04d058b33ec92901d8edd"}],"tags":["cve.org"],"epss":0.00243,"epssPercentile":0.1438,"ingestedAt":"2026-10-19T09:16:01.528Z","slug":"CVE-2026-80795","body":"## Overview\n\nIn 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->targets[NCI_MAX_DISCOVERED_TARGETS] and increments ndev->n_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->n_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().\n\n## Affected\n\n- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 0dc59de0075f88404a0f4a2b5233104ef459fbb2`\n- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 94530ffabfca57e9bff1d207106010014cc84032`\n- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < afd8605fb43becb892311102844955c3b127fc7e`\n- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 24761d3a5f692df5f7d848caeabcb2afd10917aa`\n- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951`\n- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 2f08dbce3b37624ec6b424d759336a99586170ec`\n- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < d7083f41c21b30582e91b2e6de4d54dce74f6f9c`\n- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 129032c0616d83a5e3e304f6ebf88f14ba01e5f7`\n- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < ac200079db50af81e6b04d058b33ec92901d8edd`\n- `Linux 3.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}