{"id":"CVE-2026-90223","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-90223","summary":"nfc: llcp: bound SNL TLV parsing to the skb and add length checks","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: bound SNL TLV parsing to the skb and add length checks\n\nnfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length\npair derived from skb->len, without bounding reads to the actual skb\ndata. Three problems followed:\n\n  - For a short frame (skb->len < LLCP_HEADER_SIZE), tlv_len underflowed.\n  - The per-TLV header (type, length) was read without checking that two\n    bytes remained.\n  - A declared TLV length could run past the end of the buffer, and an\n    SDREQ with length == 0 made \"service_name_len = length - 1\" underflow\n    (size_t), driving an out-of-bounds read in the following strncmp() /\n    nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3]\n    without a length check.\n\nA nearby NFC device can reach this without authentication; LLCP link\nactivation happens automatically after NFC-DEP.\n\nWalk the TLV list by pointer, bounded by skb_tail_pointer() over the\nlinear skb data, and validate each TLV declared length before use. Add\nexplicit length checks for SDREQ (>= 1) and SDRES (exactly 2).\n\nFound by 0sec automated security-research tooling (https://0sec.ai).","published":"2026-09-17T16:07:33.355Z","modified":"2026-09-20T11:30:46.685329963Z","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.270"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/02030f95820c42431280f4f945ff34247fb840ff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/587fc2a5a35b41883b22b8f808fe5d345208914b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/749a9048bf51a668ec3ab6c0392ba32325607281"},{"type":"WEB","url":"https://git.kernel.org/stable/c/88b36d36e12c9ba76decdb580d9c1907c084e587"},{"type":"WEB","url":"https://git.kernel.org/stable/c/99fdb5c2522f365efa199d0117b641e35097041e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eeb16fb24cfe67947b832fd9ada5f488afc72579"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f04ac9bf2379f3e2470c400c235eb12f74891bef"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90223.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90223"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-20T11:30:46.685329963Z"}}