{"id":"CVE-2026-98482","state":"PUBLISHED","title":"nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()","description":"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 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.","publishedAt":"2026-10-18T15:15:56.227Z","updatedAt":"2026-10-19T09:20:19.712Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"3afdbebfee2ef7e9510880868cfb482cbffe6836","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"9b4086eb67a9a3b1ce69fef1b6793827363703ce","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"51b6d73373589abb9de4d84767b0db1bc8d395d9","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"066205553a0106565bcede934f5721c25ebd6e4e","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"18f60ee882403d5b48097f5f6ae45f794e4cc643","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"810f204ef8f61f0c930cf6b3280050b3ee6a8ae7","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"744e61bd06188d8bb068c26a461c252f242b05c9","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"273f9d667cde649f8de9d72b1303cc2f4b658c50","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"]}],"references":["https://git.kernel.org/stable/c/3afdbebfee2ef7e9510880868cfb482cbffe6836","https://git.kernel.org/stable/c/9b4086eb67a9a3b1ce69fef1b6793827363703ce","https://git.kernel.org/stable/c/51b6d73373589abb9de4d84767b0db1bc8d395d9","https://git.kernel.org/stable/c/066205553a0106565bcede934f5721c25ebd6e4e","https://git.kernel.org/stable/c/18f60ee882403d5b48097f5f6ae45f794e4cc643","https://git.kernel.org/stable/c/810f204ef8f61f0c930cf6b3280050b3ee6a8ae7","https://git.kernel.org/stable/c/744e61bd06188d8bb068c26a461c252f242b05c9","https://git.kernel.org/stable/c/273f9d667cde649f8de9d72b1303cc2f4b658c50"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98482.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98482","state":"PUBLISHED","datePublished":"2026-10-18T15:15:56.227Z","dateUpdated":"2026-10-19T09:20:19.712Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.352Z"},"containers":{"cna":{"title":"nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"3afdbebfee2ef7e9510880868cfb482cbffe6836","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"9b4086eb67a9a3b1ce69fef1b6793827363703ce","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"51b6d73373589abb9de4d84767b0db1bc8d395d9","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"066205553a0106565bcede934f5721c25ebd6e4e","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"18f60ee882403d5b48097f5f6ae45f794e4cc643","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"810f204ef8f61f0c930cf6b3280050b3ee6a8ae7","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"744e61bd06188d8bb068c26a461c252f242b05c9","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"273f9d667cde649f8de9d72b1303cc2f4b658c50","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:20:19.712Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}