{"api_version":"1","generated_at":"2026-09-11T09:50:19+00:00","cve":"CVE-2026-80798","urls":{"html":"https://cve.report/CVE-2026-80798","api":"https://cve.report/api/cve/CVE-2026-80798.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80798","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80798"},"summary":{"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":"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/95674f506c6376d6722a23144c9acd26609771ed","name":"https://git.kernel.org/stable/c/95674f506c6376d6722a23144c9acd26609771ed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d3d90243393c48146911c67fd3792b549d21d9e6","name":"https://git.kernel.org/stable/c/d3d90243393c48146911c67fd3792b549d21d9e6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f36cffea24bf3e2cc29a00d4b51dbcadc087d810","name":"https://git.kernel.org/stable/c/f36cffea24bf3e2cc29a00d4b51dbcadc087d810","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ae5f20f5842f440b72d030e3a34fe182dd8eae42","name":"https://git.kernel.org/stable/c/ae5f20f5842f440b72d030e3a34fe182dd8eae42","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eab47618e282602197db287ecbd1b09d356a2515","name":"https://git.kernel.org/stable/c/eab47618e282602197db287ecbd1b09d356a2515","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e969e98410051b1ef8cc318bfe0c7e3f24ec766d","name":"https://git.kernel.org/stable/c/e969e98410051b1ef8cc318bfe0c7e3f24ec766d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82","name":"https://git.kernel.org/stable/c/e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a7b9b449f5a5132221fff6adc11a9431ab8cd914","name":"https://git.kernel.org/stable/c/a7b9b449f5a5132221fff6adc11a9431ab8cd914","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3793d768b40f38bb97265dd5b9a8b8655c4e1b1d","name":"https://git.kernel.org/stable/c/3793d768b40f38bb97265dd5b9a8b8655c4e1b1d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80798","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80798","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a f36cffea24bf3e2cc29a00d4b51dbcadc087d810 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a a7b9b449f5a5132221fff6adc11a9431ab8cd914 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 3793d768b40f38bb97265dd5b9a8b8655c4e1b1d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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":"80798","cve":"CVE-2026-80798","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_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82","status":"affected","version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","versionType":"git"},{"lessThan":"f36cffea24bf3e2cc29a00d4b51dbcadc087d810","status":"affected","version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","versionType":"git"},{"lessThan":"a7b9b449f5a5132221fff6adc11a9431ab8cd914","status":"affected","version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","versionType":"git"},{"lessThan":"3793d768b40f38bb97265dd5b9a8b8655c4e1b1d","status":"affected","version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","versionType":"git"},{"lessThan":"eab47618e282602197db287ecbd1b09d356a2515","status":"affected","version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","versionType":"git"},{"lessThan":"e969e98410051b1ef8cc318bfe0c7e3f24ec766d","status":"affected","version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","versionType":"git"},{"lessThan":"ae5f20f5842f440b72d030e3a34fe182dd8eae42","status":"affected","version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","versionType":"git"},{"lessThan":"d3d90243393c48146911c67fd3792b549d21d9e6","status":"affected","version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","versionType":"git"},{"lessThan":"95674f506c6376d6722a23144c9acd26609771ed","status":"affected","version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/nfc/llcp_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.3"},{"lessThan":"3.3","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":"3.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.218","versionStartIncluding":"3.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.185","versionStartIncluding":"3.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.154","versionStartIncluding":"3.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.106","versionStartIncluding":"3.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.47","versionStartIncluding":"3.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.11","versionStartIncluding":"3.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.1","versionStartIncluding":"3.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.3","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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)."}],"providerMetadata":{"dateUpdated":"2026-09-04T15:13:12.282Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82"},{"url":"https://git.kernel.org/stable/c/f36cffea24bf3e2cc29a00d4b51dbcadc087d810"},{"url":"https://git.kernel.org/stable/c/a7b9b449f5a5132221fff6adc11a9431ab8cd914"},{"url":"https://git.kernel.org/stable/c/3793d768b40f38bb97265dd5b9a8b8655c4e1b1d"},{"url":"https://git.kernel.org/stable/c/eab47618e282602197db287ecbd1b09d356a2515"},{"url":"https://git.kernel.org/stable/c/e969e98410051b1ef8cc318bfe0c7e3f24ec766d"},{"url":"https://git.kernel.org/stable/c/ae5f20f5842f440b72d030e3a34fe182dd8eae42"},{"url":"https://git.kernel.org/stable/c/d3d90243393c48146911c67fd3792b549d21d9e6"},{"url":"https://git.kernel.org/stable/c/95674f506c6376d6722a23144c9acd26609771ed"}],"title":"nfc: llcp: reject PDUs shorter than the LLCP header","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80798","datePublished":"2026-09-04T15:13:12.282Z","dateReserved":"2026-08-26T14:34:25.793Z","dateUpdated":"2026-09-04T15:13:12.282Z","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":"80798","Ordinal":"1","Title":"nfc: llcp: reject PDUs shorter than the LLCP header","CVE":"CVE-2026-80798","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80798","Ordinal":"1","NoteData":"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).","Type":"Description","Title":"nfc: llcp: reject PDUs shorter than the LLCP header"}]}}}