{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80800","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.793Z","datePublished":"2026-09-04T15:13:14.271Z","dateUpdated":"2026-09-04T15:13:14.271Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-04T15:13:14.271Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: bound the connect_sn TLV walk to the skb\n\nCommit 27256cdb290e (\"nfc: llcp: bound SNL TLV parsing to the skb and\nadd length checks\") fixed the unbounded TLV walk in nfc_llcp_recv_snl(),\nand commit d8bd2dedbde5 (\"nfc: llcp: fix OOB read and u8 offset wrap in\nTLV parsers\") subsequently bounded nfc_llcp_parse_gb_tlv() and\nnfc_llcp_parse_connection_tlv(). One sibling parser sharing the same\npattern remains unbounded: nfc_llcp_connect_sn().\n\nnfc_llcp_connect_sn() walks a TLV list, reading a two-byte header\n(type, length) followed by length bytes of value, without checking that\nthe two header bytes or the declared length stay within the buffer. It\nreturns a pointer to a service name of up to 255 bytes that may point\npast the end of the skb; it is subsequently consumed by memcmp() in\nnfc_llcp_sock_from_sn(). In addition tlv_array_len was computed as\n\"skb->len - LLCP_HEADER_SIZE\" in size_t, so a CONNECT/CC frame shorter\nthan the LLCP header underflows to a huge length and the walk runs far\npast the buffer.\n\nnfc_llcp_connect_sn() is reachable from nfc_llcp_recv_connect() and\nnfc_llcp_recv_cc(), i.e. from received CONNECT and CC PDUs. A nearby\nNFC device can reach this without authentication; LLCP link activation\nhappens automatically after NFC-DEP, and the nfc_llcp_rx_skb()\ndispatcher applies no minimum-length guard.\n\nWalk the TLV list by pointer, bounded by skb_tail_pointer(skb), and\nvalidate each declared length before use, matching the approach already\nused for nfc_llcp_recv_snl(). Starting the walk at\n&skb->data[LLCP_HEADER_SIZE] against the tail pointer also removes the\nsize_t underflow for short frames.\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"],"versions":[{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","lessThan":"b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e","status":"affected","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","lessThan":"e18d044bab6d3d0280639098c3fe6621692cbfe2","status":"affected","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","lessThan":"65a0ec7783b06068dda6745dd689bf4a91ee64aa","status":"affected","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","lessThan":"1964addc8dd535a05d5d3b55b4d1ac19ae31aa65","status":"affected","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","lessThan":"389986fd79e4d43f971a03b512645a1bb63c982f","status":"affected","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","lessThan":"e87527b506c40db9af528714b7b1240918eb80fc","status":"affected","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","lessThan":"22e5177ba1196a0b272a6a46c2575eb940a939c4","status":"affected","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","lessThan":"0cfbdb0e13ab5b0765d77f96af67eb879cbc9736","status":"affected","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","lessThan":"55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"],"versions":[{"version":"3.3","status":"affected"},{"version":"0","lessThan":"3.3","status":"unaffected","versionType":"semver"},{"version":"5.10.267","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.218","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.185","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.154","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.106","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.47","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.11","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2.1","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.10.267"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.15.218"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.1.185"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.6.154"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.12.106"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.18.47"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.1.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.2.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e"},{"url":"https://git.kernel.org/stable/c/e18d044bab6d3d0280639098c3fe6621692cbfe2"},{"url":"https://git.kernel.org/stable/c/65a0ec7783b06068dda6745dd689bf4a91ee64aa"},{"url":"https://git.kernel.org/stable/c/1964addc8dd535a05d5d3b55b4d1ac19ae31aa65"},{"url":"https://git.kernel.org/stable/c/389986fd79e4d43f971a03b512645a1bb63c982f"},{"url":"https://git.kernel.org/stable/c/e87527b506c40db9af528714b7b1240918eb80fc"},{"url":"https://git.kernel.org/stable/c/22e5177ba1196a0b272a6a46c2575eb940a939c4"},{"url":"https://git.kernel.org/stable/c/0cfbdb0e13ab5b0765d77f96af67eb879cbc9736"},{"url":"https://git.kernel.org/stable/c/55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8"}],"title":"nfc: llcp: bound the connect_sn TLV walk to the skb","x_generator":{"engine":"bippy-1.2.0"}}}}