CVE-2026-80799 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1
https://git.kernel.org/stable/c/2d239590d1845a706304833d40dd6d4fec20ad88
https://git.kernel.org/stable/c/382eaa770335acf4f16a5a55524500f2bb4207df
https://git.kernel.org/stable/c/78b20c8eeacd2e44a2d8a4cb5316d3c521d90911
https://git.kernel.org/stable/c/7f6f3d087c67a4346189ef2c36481455bbc59a74
https://git.kernel.org/stable/c/875285a165fd3b402de2ab3be0deb355d6f4caf5
https://git.kernel.org/stable/c/9c47d667963542c3cf8e3007b7f10c0904d08238
https://git.kernel.org/stable/c/a209334ed929941b20810c17c3a507445b0a7c85
https://git.kernel.org/stable/c/e84cdfdc4a6c88e8b751144458f2e04e24415a28

Type	Values Removed	Values Added
Weaknesses		CWE-119 CWE-200

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers nfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv() contain three related bugs in their TLV parsing loops: 1. 'offset' is declared u8 but tlv_array_len is u16. When TLV data advances offset past 255 it silently wraps to zero, causing infinite loops or double-processing of buffer data. 2. Before reading tlv[0] (type) and tlv[1] (length) there is no check that offset+2 <= tlv_array_len. A truncated TLV causes an OOB read of one byte past the buffer end. 3. After reading the length field, the value bytes are accessed without checking offset+2+length <= tlv_array_len. A crafted length=0xFF on a short buffer causes up to 255 bytes of OOB read past the buffer end. Both functions are reachable without authentication via nfc_llcp_set_remote_gb() which feeds remote LLCP general bytes directly into nfc_llcp_parse_gb_tlv() with no additional validation. Fix all three issues by widening offset from u8 to u16 and adding bounds checks for both the TLV header and value field before each access.
Title		nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1 https://git.kernel.org/stable/c/2d239590d1845a706304833d40dd6d4fec20ad88 https://git.kernel.org/stable/c/382eaa770335acf4f16a5a55524500f2bb4207df https://git.kernel.org/stable/c/78b20c8eeacd2e44a2d8a4cb5316d3c521d90911 https://git.kernel.org/stable/c/7f6f3d087c67a4346189ef2c36481455bbc59a74 https://git.kernel.org/stable/c/875285a165fd3b402de2ab3be0deb355d6f4caf5 https://git.kernel.org/stable/c/9c47d667963542c3cf8e3007b7f10c0904d08238 https://git.kernel.org/stable/c/a209334ed929941b20810c17c3a507445b0a7c85 https://git.kernel.org/stable/c/e84cdfdc4a6c88e8b751144458f2e04e24415a28

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80799", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.793Z", "datePublished": "2026-09-04T15:13:13.311Z", "dateUpdated": "2026-09-04T15:13:13.311Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-04T15:13:13.311Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/nfc/llcp_commands.c"], "versions": [{"version": "0be9de2ea01e8d52646e7310a7eef5459cf07ea8", "lessThan": "2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1", "status": "affected", "versionType": "git"}, {"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0", "lessThan": "7f6f3d087c67a4346189ef2c36481455bbc59a74", "status": "affected", "versionType": "git"}, {"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0", "lessThan": "9c47d667963542c3cf8e3007b7f10c0904d08238", "status": "affected", "versionType": "git"}, {"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0", "lessThan": "a209334ed929941b20810c17c3a507445b0a7c85", "status": "affected", "versionType": "git"}, {"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0", "lessThan": "382eaa770335acf4f16a5a55524500f2bb4207df", "status": "affected", "versionType": "git"}, {"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0", "lessThan": "2d239590d1845a706304833d40dd6d4fec20ad88", "status": "affected", "versionType": "git"}, {"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0", "lessThan": "e84cdfdc4a6c88e8b751144458f2e04e24415a28", "status": "affected", "versionType": "git"}, {"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0", "lessThan": "875285a165fd3b402de2ab3be0deb355d6f4caf5", "status": "affected", "versionType": "git"}, {"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0", "lessThan": "78b20c8eeacd2e44a2d8a4cb5316d3c521d90911", "status": "affected", "versionType": "git"}, {"version": "1deacb5e031e289ca5636f2db4fcae6612c05d34", "status": "affected", "versionType": "git"}, {"version": "66a1be74230bbe098e651766c9a0cf4038db8442", "status": "affected", "versionType": "git"}, {"version": "5.10.188", "lessThan": "5.10.267", "status": "affected", "versionType": "semver"}, {"version": "4.19.291", "lessThan": "4.20", "status": "affected", "versionType": "semver"}, {"version": "5.4.251", "lessThan": "5.5", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/nfc/llcp_commands.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "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": "5.10.188", "versionEndExcluding": "5.10.267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.218"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.185"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.154"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.106"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.47"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1.11"}, {"vulnerable": true, "criteria": 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"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"}}}}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-80799", "lastModified": "2026-09-04T16:18:06.637", "metrics": {}, "published": "2026-09-04T16:18:06.637", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2d239590d1845a706304833d40dd6d4fec20ad88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/382eaa770335acf4f16a5a55524500f2bb4207df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/78b20c8eeacd2e44a2d8a4cb5316d3c521d90911"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7f6f3d087c67a4346189ef2c36481455bbc59a74"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/875285a165fd3b402de2ab3be0deb355d6f4caf5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9c47d667963542c3cf8e3007b7f10c0904d08238"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a209334ed929941b20810c17c3a507445b0a7c85"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e84cdfdc4a6c88e8b751144458f2e04e24415a28"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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