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CVE-2026-80799 (GCVE-0-2026-80799)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0be9de2ea01e8d52646e7310a7eef5459cf07ea8 , < 2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1 (git)
Affected: 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 , < 7f6f3d087c67a4346189ef2c36481455bbc59a74 (git)
Affected: 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 , < 9c47d667963542c3cf8e3007b7f10c0904d08238 (git)
Affected: 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 , < a209334ed929941b20810c17c3a507445b0a7c85 (git)
Affected: 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 , < 382eaa770335acf4f16a5a55524500f2bb4207df (git)
Affected: 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 , < 2d239590d1845a706304833d40dd6d4fec20ad88 (git)
Affected: 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 , < e84cdfdc4a6c88e8b751144458f2e04e24415a28 (git)
Affected: 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 , < 875285a165fd3b402de2ab3be0deb355d6f4caf5 (git)
Affected: 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 , < 78b20c8eeacd2e44a2d8a4cb5316d3c521d90911 (git)
Affected: 1deacb5e031e289ca5636f2db4fcae6612c05d34 (git)
Affected: 66a1be74230bbe098e651766c9a0cf4038db8442 (git)
Affected: 5.10.188 , < 5.10.267 (semver)
Affected: 4.19.291 , < 4.20 (semver)
Affected: 5.4.251 , < 5.5 (semver)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.10.267 , ≤ 5.10.* (semver)
Unaffected: 5.15.218 , ≤ 5.15.* (semver)
Unaffected: 6.1.185 , ≤ 6.1.* (semver)
Unaffected: 6.6.154 , ≤ 6.6.* (semver)
Unaffected: 6.12.106 , ≤ 6.12.* (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "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. \u0027offset\u0027 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 \u003c= 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 \u003c= 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."
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    "datePublished": "2026-09-04T15:13:13.311Z",
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      "date": "2026-09-14",
      "epss": "0.00234",
      "percentile": "0.14366"
    },
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      "cve": "CVE-2026-80799",
      "id": "msrc_CVE-2026-80799",
      "initial_release_date": "2026-09-07T01:57:08.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80799.json",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80799\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:06.637\",\"lastModified\":\"2026-09-04T16:18:06.637\",\"vulnStatus\":\"Received\",\"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. \u0027offset\u0027 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 \u003c= 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 \u003c= 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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/nfc/llcp_commands.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0be9de2ea01e8d52646e7310a7eef5459cf07ea8\",\"lessThan\":\"2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0\",\"lessThan\":\"7f6f3d087c67a4346189ef2c36481455bbc59a74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0\",\"lessThan\":\"9c47d667963542c3cf8e3007b7f10c0904d08238\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0\",\"lessThan\":\"a209334ed929941b20810c17c3a507445b0a7c85\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0\",\"lessThan\":\"382eaa770335acf4f16a5a55524500f2bb4207df\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0\",\"lessThan\":\"2d239590d1845a706304833d40dd6d4fec20ad88\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0\",\"lessThan\":\"e84cdfdc4a6c88e8b751144458f2e04e24415a28\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0\",\"lessThan\":\"875285a165fd3b402de2ab3be0deb355d6f4caf5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df40eb3a2ea58bf404a38f15a7a2768e4762cb0\",\"lessThan\":\"78b20c8eeacd2e44a2d8a4cb5316d3c521d90911\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1deacb5e031e289ca5636f2db4fcae6612c05d34\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"66a1be74230bbe098e651766c9a0cf4038db8442\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.188\",\"lessThan\":\"5.10.267\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.291\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.251\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/nfc/llcp_commands.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.267\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.218\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T01:51:23Z",
      "cve": "CVE-2026-80799",
      "id": "CVE-2026-80799",
      "initial_release_date": "2026-09-05T00:27:10Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "323",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80799",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80799.json",
      "version": "5"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.