{"id":"CVE-2026-80794","title":"nfc: nci: fix uninit-value in the RF discover/activated NTF handlers","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: fix uninit-value in the RF discover/activated NTF handlers\n\nnci_rf_discover_ntf_packet() and nci_rf_intf_activated_ntf_packet() each\nparse a notification into…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 1007a6b429d756513abd25bd00290908f2e89a4a","Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 4bda9ef8392710f21e99027467f3f4afdfb5c99a","Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < fe69fed3495f676578d49414a069ad7d8468e2ce","Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 7489f59d1ea2d3298aa41de7baf193e5e6e132f6","Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 7086dab72b3ed95df96842801e10e935cfeb27a3","Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 0d4b5cfab6891a5ca0f6aef209beebba4bd7c095","Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 5bd00c0e1470d90d77a7c60242854257ddf14e00","Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < d6f743d3d388913135681cde051c08823730194f","Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 8cbe06c1e699c0a165dae5093a2550e65f914818","Linux 3.3"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:43:47.481Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80794","references":[{"url":"https://git.kernel.org/stable/c/1007a6b429d756513abd25bd00290908f2e89a4a"},{"url":"https://git.kernel.org/stable/c/4bda9ef8392710f21e99027467f3f4afdfb5c99a"},{"url":"https://git.kernel.org/stable/c/fe69fed3495f676578d49414a069ad7d8468e2ce"},{"url":"https://git.kernel.org/stable/c/7489f59d1ea2d3298aa41de7baf193e5e6e132f6"},{"url":"https://git.kernel.org/stable/c/7086dab72b3ed95df96842801e10e935cfeb27a3"},{"url":"https://git.kernel.org/stable/c/0d4b5cfab6891a5ca0f6aef209beebba4bd7c095"},{"url":"https://git.kernel.org/stable/c/5bd00c0e1470d90d77a7c60242854257ddf14e00"},{"url":"https://git.kernel.org/stable/c/d6f743d3d388913135681cde051c08823730194f"},{"url":"https://git.kernel.org/stable/c/8cbe06c1e699c0a165dae5093a2550e65f914818"}],"tags":["cve.org"],"epss":0.00243,"epssPercentile":0.14379,"ingestedAt":"2026-10-19T09:16:01.529Z","slug":"CVE-2026-80794","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: fix uninit-value in the RF discover/activated NTF handlers\n\nnci_rf_discover_ntf_packet() and nci_rf_intf_activated_ntf_packet() each\nparse a notification into an on-stack struct (nci_rf_discover_ntf /\nnci_rf_intf_activated_ntf) that is not initialised. The RF\ntechnology-specific parameters are only extracted when\nrf_tech_specific_params_len is non-zero, so a notification that reports a\nzero length leaves the rf_tech_specific_params union uninitialised - and\nboth handlers then pass it to nci_add_new_protocol(), which reads it:\n\n - discover:  nci_add_new_target() -> nci_add_new_protocol();\n - activated: nci_target_auto_activated() -> nci_add_new_protocol().\n\nnci_add_new_protocol() uses nfca_poll->nfcid1_len as both a branch\ncondition and a memcpy() length and copies nfcid1/sens_res/sel_res into\nndev->targets, which is later exposed to user space via NFC_CMD_GET_TARGET.\n\n  BUG: KMSAN: uninit-value in nci_add_new_protocol+0x624/0x6c0\n   nci_add_new_protocol+0x624/0x6c0\n   nci_ntf_packet+0x25b2/0x3c30\n   nci_rx_work+0x318/0x5d0\n   process_scheduled_works+0x84b/0x17a0\n   worker_thread+0xc10/0x11b0\n   kthread+0x376/0x500\n  Local variable ntf.i created at:\n   nci_ntf_packet+0xbc2/0x3c30\n\nZero-initialise both on-stack notifications so the union reads back as\nzero when no technology-specific parameters are present.\n\n## Affected\n\n- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 1007a6b429d756513abd25bd00290908f2e89a4a`\n- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 4bda9ef8392710f21e99027467f3f4afdfb5c99a`\n- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < fe69fed3495f676578d49414a069ad7d8468e2ce`\n- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 7489f59d1ea2d3298aa41de7baf193e5e6e132f6`\n- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 7086dab72b3ed95df96842801e10e935cfeb27a3`\n- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 0d4b5cfab6891a5ca0f6aef209beebba4bd7c095`\n- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 5bd00c0e1470d90d77a7c60242854257ddf14e00`\n- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < d6f743d3d388913135681cde051c08823730194f`\n- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 8cbe06c1e699c0a165dae5093a2550e65f914818`\n- `Linux 3.3`\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":[]}