{"api_version":"1","generated_at":"2026-10-01T14:58:41+00:00","cve":"CVE-2026-80799","urls":{"html":"https://cve.report/CVE-2026-80799","api":"https://cve.report/api/cve/CVE-2026-80799.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80799","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80799"},"summary":{"title":"nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-04 16:18:06","updated_at":"2026-09-04 16:18:06"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a209334ed929941b20810c17c3a507445b0a7c85","name":"https://git.kernel.org/stable/c/a209334ed929941b20810c17c3a507445b0a7c85","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e84cdfdc4a6c88e8b751144458f2e04e24415a28","name":"https://git.kernel.org/stable/c/e84cdfdc4a6c88e8b751144458f2e04e24415a28","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1","name":"https://git.kernel.org/stable/c/2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7f6f3d087c67a4346189ef2c36481455bbc59a74","name":"https://git.kernel.org/stable/c/7f6f3d087c67a4346189ef2c36481455bbc59a74","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/875285a165fd3b402de2ab3be0deb355d6f4caf5","name":"https://git.kernel.org/stable/c/875285a165fd3b402de2ab3be0deb355d6f4caf5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2d239590d1845a706304833d40dd6d4fec20ad88","name":"https://git.kernel.org/stable/c/2d239590d1845a706304833d40dd6d4fec20ad88","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9c47d667963542c3cf8e3007b7f10c0904d08238","name":"https://git.kernel.org/stable/c/9c47d667963542c3cf8e3007b7f10c0904d08238","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/382eaa770335acf4f16a5a55524500f2bb4207df","name":"https://git.kernel.org/stable/c/382eaa770335acf4f16a5a55524500f2bb4207df","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/78b20c8eeacd2e44a2d8a4cb5316d3c521d90911","name":"https://git.kernel.org/stable/c/78b20c8eeacd2e44a2d8a4cb5316d3c521d90911","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80799","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80799","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0be9de2ea01e8d52646e7310a7eef5459cf07ea8 2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 7f6f3d087c67a4346189ef2c36481455bbc59a74 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 9c47d667963542c3cf8e3007b7f10c0904d08238 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 a209334ed929941b20810c17c3a507445b0a7c85 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 66a1be74230bbe098e651766c9a0cf4038db8442 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.188 5.10.267 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19.291 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4.251 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.267 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.218 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.185 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.154 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.106 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.47 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.11 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.1 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80799","cve":"CVE-2026-80799","epss":"0.002340000","percentile":"0.142170000","score_date":"2026-09-07","updated_at":"2026-09-08 00:05:27"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/nfc/llcp_commands.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1","status":"affected","version":"0be9de2ea01e8d52646e7310a7eef5459cf07ea8","versionType":"git"},{"lessThan":"7f6f3d087c67a4346189ef2c36481455bbc59a74","status":"affected","version":"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0","versionType":"git"},{"lessThan":"9c47d667963542c3cf8e3007b7f10c0904d08238","status":"affected","version":"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0","versionType":"git"},{"lessThan":"a209334ed929941b20810c17c3a507445b0a7c85","status":"affected","version":"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0","versionType":"git"},{"lessThan":"382eaa770335acf4f16a5a55524500f2bb4207df","status":"affected","version":"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0","versionType":"git"},{"lessThan":"2d239590d1845a706304833d40dd6d4fec20ad88","status":"affected","version":"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0","versionType":"git"},{"lessThan":"e84cdfdc4a6c88e8b751144458f2e04e24415a28","status":"affected","version":"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0","versionType":"git"},{"lessThan":"875285a165fd3b402de2ab3be0deb355d6f4caf5","status":"affected","version":"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0","versionType":"git"},{"lessThan":"78b20c8eeacd2e44a2d8a4cb5316d3c521d90911","status":"affected","version":"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0","versionType":"git"},{"status":"affected","version":"1deacb5e031e289ca5636f2db4fcae6612c05d34","versionType":"git"},{"status":"affected","version":"66a1be74230bbe098e651766c9a0cf4038db8442","versionType":"git"},{"lessThan":"5.10.267","status":"affected","version":"5.10.188","versionType":"semver"},{"lessThan":"4.20","status":"affected","version":"4.19.291","versionType":"semver"},{"lessThan":"5.5","status":"affected","version":"5.4.251","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/nfc/llcp_commands.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.15"},{"lessThan":"5.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.267","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.218","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.185","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.154","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.106","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.47","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.11","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.1","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.267","versionStartIncluding":"5.10.188","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.218","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.185","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.154","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.106","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.47","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.11","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.1","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.291","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.251","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-04T15:13:13.311Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1"},{"url":"https://git.kernel.org/stable/c/7f6f3d087c67a4346189ef2c36481455bbc59a74"},{"url":"https://git.kernel.org/stable/c/9c47d667963542c3cf8e3007b7f10c0904d08238"},{"url":"https://git.kernel.org/stable/c/a209334ed929941b20810c17c3a507445b0a7c85"},{"url":"https://git.kernel.org/stable/c/382eaa770335acf4f16a5a55524500f2bb4207df"},{"url":"https://git.kernel.org/stable/c/2d239590d1845a706304833d40dd6d4fec20ad88"},{"url":"https://git.kernel.org/stable/c/e84cdfdc4a6c88e8b751144458f2e04e24415a28"},{"url":"https://git.kernel.org/stable/c/875285a165fd3b402de2ab3be0deb355d6f4caf5"},{"url":"https://git.kernel.org/stable/c/78b20c8eeacd2e44a2d8a4cb5316d3c521d90911"}],"title":"nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80799","datePublished":"2026-09-04T15:13:13.311Z","dateReserved":"2026-08-26T14:34:25.793Z","dateUpdated":"2026-09-04T15:13:13.311Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-04 16:18:06","lastModifiedDate":"2026-09-04 16:18:06","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80799","Ordinal":"1","Title":"nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers","CVE":"CVE-2026-80799","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80799","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers"}]}}}