{"id":"CVE-2026-80799","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-80799","generatedAt":"2026-10-28T04:31:56.960Z","title":"In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers nfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv() contain three related bugs in their TLV parsing loops: 1. 'offset'…","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: fix OOB read and u8 offset wrap in TLV parsers\n\nnfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv() contain\nthree related bugs in their TLV parsing loops:\n\n1. 'offset' is declared u8 but tlv_array_len is u16. When TLV data\n   advances offset past 255 it silently wraps to zero, causing\n   infinite loops or double-processing of buffer data.\n\n2. Before reading tlv[0] (type) and tlv[1] (length) there is no\n   check that offset+2 <= tlv_array_len. A truncated TLV causes\n   an OOB read of one byte past the buffer end.\n\n3. After reading the length field, the value bytes are accessed\n   without checking offset+2+length <= tlv_array_len. A crafted\n   length=0xFF on a short buffer causes up to 255 bytes of OOB\n   read past the buffer end.\n\nBoth functions are reachable without authentication via\nnfc_llcp_set_remote_gb() which feeds remote LLCP general bytes\ndirectly into nfc_llcp_parse_gb_tlv() with no additional\nvalidation.\n\nFix all three issues by widening offset from u8 to u16 and adding\nbounds checks for both the TLV header and value field before each\naccess.","published":"2026-09-04T16:18:07.000Z","lastModified":"2026-10-19T09:17:14.000Z","status":"Received","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":null,"cwe":[],"affected":[],"epss":{"score":0.00234,"percentile":0.14235,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"unknown","text":"Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2d239590d1845a706304833d40dd6d4fec20ad88","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/382eaa770335acf4f16a5a55524500f2bb4207df","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/78b20c8eeacd2e44a2d8a4cb5316d3c521d90911","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7f6f3d087c67a4346189ef2c36481455bbc59a74","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/875285a165fd3b402de2ab3be0deb355d6f4caf5","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9c47d667963542c3cf8e3007b7f10c0904d08238","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a209334ed929941b20810c17c3a507445b0a7c85","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e84cdfdc4a6c88e8b751144458f2e04e24415a28","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80799","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}