{"id":"CVE-2026-80798","revision":"d77214c746444267a195b109bbf0e0c4","records":[{"revision":"d77214c746444267a195b109bbf0e0c4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80798","aliases":[],"title":"nfc: llcp: reject PDUs shorter than the LLCP header","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: reject PDUs shorter than the LLCP header\n\nEvery LLCP PDU begins with a two-byte header (DSAP/SSAP + PTYPE), but the\nreceive path never checked that a frame is at least LLCP_HEADER_SIZE bytes\nbefore parsing it.\n\nnfc_llcp_rx_skb() reads the header via nfc_llcp_ptype()/nfc_llcp_dsap()/\nnfc_llcp_ssap(), which dereference pdu->data[0] and pdu->data[1], and a\nCONNECT or CC PDU then computes\n\n\ttlv_array_len = skb->len - LLCP_HEADER_SIZE;\n\nas a size_t and hands it to the TLV walk. When the frame is shorter than\nthe header the subtraction wraps to a huge value and the walk runs far\npast the buffer, an out-of-bounds read.\n\nA nearby NFC device can reach this without authentication; LLCP link\nactivation happens automatically after NFC-DEP.\n\nGuard the common receive choke point __nfc_llcp_recv(), shared by both the\ntarget (nfc_llcp_data_received()) and initiator (nfc_llcp_recv()) paths, so\na short skb is dropped before the rx_work worker parses it. Use\npskb_may_pull() rather than a skb->len test so the two header bytes are\nguaranteed to sit in the skb linear area even for a non-linear skb,\nmatching how the sibling NCI and HCI receive paths validate their headers.\n\nReproduced with a KFENCE out-of-bounds read via /dev/virtual_nci on\nlinux-next.\n\nFound by 0sec automated security-research tooling (https://0sec.ai).","state":0,"publishedAt":"2026-09-04T15:13:12.282+00:00","modifiedAt":"2026-10-19T08:43:51.441+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/nfc/llcp_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"f36cffea24bf3e2cc29a00d4b51dbcadc087d810\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"a7b9b449f5a5132221fff6adc11a9431ab8cd914\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"3793d768b40f38bb97265dd5b9a8b8655c4e1b1d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"eab47618e282602197db287ecbd1b09d356a2515\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"e969e98410051b1ef8cc318bfe0c7e3f24ec766d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"ae5f20f5842f440b72d030e3a34fe182dd8eae42\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"d3d90243393c48146911c67fd3792b549d21d9e6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"95674f506c6376d6722a23144c9acd26609771ed\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/nfc/llcp_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.267\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.218\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.185\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.154\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.106\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.47\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.11\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.1\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82","https://git.kernel.org/stable/c/f36cffea24bf3e2cc29a00d4b51dbcadc087d810","https://git.kernel.org/stable/c/a7b9b449f5a5132221fff6adc11a9431ab8cd914","https://git.kernel.org/stable/c/3793d768b40f38bb97265dd5b9a8b8655c4e1b1d","https://git.kernel.org/stable/c/eab47618e282602197db287ecbd1b09d356a2515","https://git.kernel.org/stable/c/e969e98410051b1ef8cc318bfe0c7e3f24ec766d","https://git.kernel.org/stable/c/ae5f20f5842f440b72d030e3a34fe182dd8eae42","https://git.kernel.org/stable/c/d3d90243393c48146911c67fd3792b549d21d9e6","https://git.kernel.org/stable/c/95674f506c6376d6722a23144c9acd26609771ed"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80798","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80798","identifiers":["CVE-2026-80798"]},"retained":false,"historicalAffected":[]}],"coverage":[]}