{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80798", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.793Z", "datePublished": "2026-09-04T15:13:12.282Z", "dateUpdated": "2026-10-19T08:43:51.441Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:43:51.441Z" }, "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)." } ], "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": "e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82", "status": "affected", "versionType": "git" }, { "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "f36cffea24bf3e2cc29a00d4b51dbcadc087d810", "status": "affected", "versionType": "git" }, { "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "a7b9b449f5a5132221fff6adc11a9431ab8cd914", "status": "affected", "versionType": "git" }, { "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "3793d768b40f38bb97265dd5b9a8b8655c4e1b1d", "status": "affected", "versionType": "git" }, { "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "eab47618e282602197db287ecbd1b09d356a2515", "status": "affected", "versionType": "git" }, { "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "e969e98410051b1ef8cc318bfe0c7e3f24ec766d", "status": "affected", "versionType": "git" }, { "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "ae5f20f5842f440b72d030e3a34fe182dd8eae42", "status": "affected", "versionType": "git" }, { "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "d3d90243393c48146911c67fd3792b549d21d9e6", "status": "affected", "versionType": "git" }, { "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "95674f506c6376d6722a23144c9acd26609771ed", "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", "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" } ] } ] } ], "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" } } } }