{"id":"CVE-2026-98482","title":"nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()\n\nnfc_llcp_recv_hdlc() reads the sequence byte skb->data[2], via\nnfc_llcp_ns()/nfc_llcp_nr(), before any …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 3afdbebfee2ef7e9510880868cfb482cbffe6836","Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 9b4086eb67a9a3b1ce69fef1b6793827363703ce","Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 51b6d73373589abb9de4d84767b0db1bc8d395d9","Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 066205553a0106565bcede934f5721c25ebd6e4e","Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 18f60ee882403d5b48097f5f6ae45f794e4cc643","Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 810f204ef8f61f0c930cf6b3280050b3ee6a8ae7","Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 744e61bd06188d8bb068c26a461c252f242b05c9","Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 273f9d667cde649f8de9d72b1303cc2f4b658c50","Linux 3.3"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:15:56.227Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98482","references":[{"url":"https://git.kernel.org/stable/c/3afdbebfee2ef7e9510880868cfb482cbffe6836"},{"url":"https://git.kernel.org/stable/c/9b4086eb67a9a3b1ce69fef1b6793827363703ce"},{"url":"https://git.kernel.org/stable/c/51b6d73373589abb9de4d84767b0db1bc8d395d9"},{"url":"https://git.kernel.org/stable/c/066205553a0106565bcede934f5721c25ebd6e4e"},{"url":"https://git.kernel.org/stable/c/18f60ee882403d5b48097f5f6ae45f794e4cc643"},{"url":"https://git.kernel.org/stable/c/810f204ef8f61f0c930cf6b3280050b3ee6a8ae7"},{"url":"https://git.kernel.org/stable/c/744e61bd06188d8bb068c26a461c252f242b05c9"},{"url":"https://git.kernel.org/stable/c/273f9d667cde649f8de9d72b1303cc2f4b658c50"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T15:45:12.295Z","slug":"CVE-2026-98482","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()\n\nnfc_llcp_recv_hdlc() reads the sequence byte skb->data[2], via\nnfc_llcp_ns()/nfc_llcp_nr(), before any length check. The receive path\nonly guarantees the two-byte LLCP header -- __nfc_llcp_recv() checks it\nwith pskb_may_pull() and nfc_llcp_recv_agf() admits two-byte inner PDUs\n-- so a two-byte I, RR or RNR PDU reads one byte of uninitialised skb\ntailroom. The byte becomes N(R)/N(S); a peer can already set those with\na well-formed PDU, so this is acting on uninitialised memory, not new\npeer control.\n\nGuard the read with pskb_may_pull(), as commit 95674f506c63 (\"nfc: llcp:\nreject PDUs shorter than the LLCP header\") did for the two-byte header,\nso the sequence byte is present and linear before it is read. RR and RNR\nPDUs are LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE bytes and an I PDU is\nlonger, so no valid frame is rejected; a truncated PDU is malformed, so\nreturn without a DM reply.\n\n## Affected\n\n- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 3afdbebfee2ef7e9510880868cfb482cbffe6836`\n- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 9b4086eb67a9a3b1ce69fef1b6793827363703ce`\n- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 51b6d73373589abb9de4d84767b0db1bc8d395d9`\n- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 066205553a0106565bcede934f5721c25ebd6e4e`\n- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 18f60ee882403d5b48097f5f6ae45f794e4cc643`\n- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 810f204ef8f61f0c930cf6b3280050b3ee6a8ae7`\n- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 744e61bd06188d8bb068c26a461c252f242b05c9`\n- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 273f9d667cde649f8de9d72b1303cc2f4b658c50`\n- `Linux 3.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}