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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-80799

nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 0be9de2ea01e8d52646e7310a7eef5459cf07ea8 to < 2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1affected
  • 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 to < 7f6f3d087c67a4346189ef2c36481455bbc59a74affected
  • 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 to < 9c47d667963542c3cf8e3007b7f10c0904d08238affected
  • 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 to < a209334ed929941b20810c17c3a507445b0a7c85affected
  • 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 to < 382eaa770335acf4f16a5a55524500f2bb4207dfaffected
  • 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 to < 2d239590d1845a706304833d40dd6d4fec20ad88affected
  • 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 to < e84cdfdc4a6c88e8b751144458f2e04e24415a28affected
  • 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 to < 875285a165fd3b402de2ab3be0deb355d6f4caf5affected
  • 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 to < 78b20c8eeacd2e44a2d8a4cb5316d3c521d90911affected
  • 1deacb5e031e289ca5636f2db4fcae6612c05d34affected
  • 66a1be74230bbe098e651766c9a0cf4038db8442affected
  • 5.10.188 to < 5.10.267affected
  • 4.19.291 to < 4.20affected
  • 5.4.251 to < 5.5affected

Linux Linux

Default version status: affected

  • 5.15affected
  • 0 to < 5.15unaffected
  • 5.10.267 to ≤ 5.10.*unaffected
  • 5.15.218 to ≤ 5.15.*unaffected
  • 6.1.185 to ≤ 6.1.*unaffected
  • 6.6.154 to ≤ 6.6.*unaffected
  • 6.12.106 to ≤ 6.12.*unaffected
  • 6.18.47 to ≤ 6.18.*unaffected
  • 7.1.11 to ≤ 7.1.*unaffected
  • 7.2.1 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References