{"api_version":"1","generated_at":"2026-09-11T16:17:15+00:00","cve":"CVE-2026-80796","urls":{"html":"https://cve.report/CVE-2026-80796","api":"https://cve.report/api/cve/CVE-2026-80796.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80796","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80796"},"summary":{"title":"nfc: nci: add data_len bound checks to activation parameter extractors","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: add data_len bound checks to activation parameter extractors\n\nnci_extract_activation_params_iso_dep() and\nnci_extract_activation_params_nfc_dep() read an inner length byte from\nthe NCI RF_INTF_ACTIVATED_NTF payload and use it to memcpy() into fixed\nkernel buffers, but neither function receives the caller-validated\nactivation_params_len.  A crafted NCI notification with\nactivation_params_len=1 and an inner length byte of up to 20 (NFC-A) or\n50 (NFC-B) causes memcpy() to read that many bytes past the one valid\nbyte in the activation params region -- a slab out-of-bounds read of\nkernel memory adjacent to the NCI skb.\n\nThe sibling nci_extract_rf_params_*() family was given equivalent\nprotection by commit 571dcbeb8e63 (\"net: nfc: nci: Fix parameter\nvalidation for packet data\"), but the two activation parameter\nextractors were not updated at that time.\n\nAdd a data_len parameter to both functions, guard against an empty\nregion before consuming the inner length byte, decrement the remaining\ncount after consuming it, and clamp the copy length to what is actually\navailable.  Update both call sites to pass ntf.activation_params_len,\nwhich is already validated against the skb at ntf.c:801.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-04 16:18:06","updated_at":"2026-09-04 16:18:06"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/cf9d44be50b9074a5abdc301b4a3ba3e283591df","name":"https://git.kernel.org/stable/c/cf9d44be50b9074a5abdc301b4a3ba3e283591df","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1168484fe2b3828bf24a46f3c42a8719fade679b","name":"https://git.kernel.org/stable/c/1168484fe2b3828bf24a46f3c42a8719fade679b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/04e51353cb9fa321caaeeed8331d4cd041fbaca7","name":"https://git.kernel.org/stable/c/04e51353cb9fa321caaeeed8331d4cd041fbaca7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e25b44bd8b8cc666b49a3fe0ef547e64d5b1e300","name":"https://git.kernel.org/stable/c/e25b44bd8b8cc666b49a3fe0ef547e64d5b1e300","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f5c534b53f8c424a8e7633c9b585475c4bf4ee18","name":"https://git.kernel.org/stable/c/f5c534b53f8c424a8e7633c9b585475c4bf4ee18","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9620a91f8d643b680f417a435db399a04d1e06d8","name":"https://git.kernel.org/stable/c/9620a91f8d643b680f417a435db399a04d1e06d8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/be311c0cfeadfbe815ea22d2914a98d06e3fab0e","name":"https://git.kernel.org/stable/c/be311c0cfeadfbe815ea22d2914a98d06e3fab0e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0428fa2c22e2ba0cff766d3b80d461e149102045","name":"https://git.kernel.org/stable/c/0428fa2c22e2ba0cff766d3b80d461e149102045","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9b01f5af0dc59263b59391b148bc78d83c0354a9","name":"https://git.kernel.org/stable/c/9b01f5af0dc59263b59391b148bc78d83c0354a9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80796","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80796","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 1168484fe2b3828bf24a46f3c42a8719fade679b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 be311c0cfeadfbe815ea22d2914a98d06e3fab0e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 04e51353cb9fa321caaeeed8331d4cd041fbaca7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 e25b44bd8b8cc666b49a3fe0ef547e64d5b1e300 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: add data_len bound checks to activation parameter extractors\n\nnci_extract_activation_params_iso_dep() and\nnci_extract_activation_params_nfc_dep() read an inner length byte from\nthe NCI RF_INTF_ACTIVATED_NTF payload and use it to memcpy() into fixed\nkernel buffers, but neither function receives the caller-validated\nactivation_params_len.  A crafted NCI notification with\nactivation_params_len=1 and an inner length byte of up to 20 (NFC-A) or\n50 (NFC-B) causes memcpy() to read that many bytes past the one valid\nbyte in the activation params region -- a slab out-of-bounds read of\nkernel memory adjacent to the NCI skb.\n\nThe sibling nci_extract_rf_params_*() family was given equivalent\nprotection by commit 571dcbeb8e63 (\"net: nfc: nci: Fix parameter\nvalidation for packet data\"), but the two activation parameter\nextractors were not updated at that time.\n\nAdd a data_len parameter to both functions, guard against an empty\nregion before consuming the inner length byte, decrement the remaining\ncount after consuming it, and clamp the copy length to what is actually\navailable.  Update both call sites to pass ntf.activation_params_len,\nwhich is already validated against the skb at ntf.c:801."}],"providerMetadata":{"dateUpdated":"2026-09-04T15:13:09.857Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1168484fe2b3828bf24a46f3c42a8719fade679b"},{"url":"https://git.kernel.org/stable/c/be311c0cfeadfbe815ea22d2914a98d06e3fab0e"},{"url":"https://git.kernel.org/stable/c/04e51353cb9fa321caaeeed8331d4cd041fbaca7"},{"url":"https://git.kernel.org/stable/c/e25b44bd8b8cc666b49a3fe0ef547e64d5b1e300"},{"url":"https://git.kernel.org/stable/c/9b01f5af0dc59263b59391b148bc78d83c0354a9"},{"url":"https://git.kernel.org/stable/c/9620a91f8d643b680f417a435db399a04d1e06d8"},{"url":"https://git.kernel.org/stable/c/cf9d44be50b9074a5abdc301b4a3ba3e283591df"},{"url":"https://git.kernel.org/stable/c/f5c534b53f8c424a8e7633c9b585475c4bf4ee18"},{"url":"https://git.kernel.org/stable/c/0428fa2c22e2ba0cff766d3b80d461e149102045"}],"title":"nfc: nci: add data_len bound checks to activation parameter extractors","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80796","datePublished":"2026-09-04T15:13:09.857Z","dateReserved":"2026-08-26T14:34:25.793Z","dateUpdated":"2026-09-04T15:13:09.857Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-04 16:18:06","lastModifiedDate":"2026-09-04 16:18:06","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80796","Ordinal":"1","Title":"nfc: nci: add data_len bound checks to activation parameter extr","CVE":"CVE-2026-80796","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80796","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: add data_len bound checks to activation parameter extractors\n\nnci_extract_activation_params_iso_dep() and\nnci_extract_activation_params_nfc_dep() read an inner length byte from\nthe NCI RF_INTF_ACTIVATED_NTF payload and use it to memcpy() into fixed\nkernel buffers, but neither function receives the caller-validated\nactivation_params_len.  A crafted NCI notification with\nactivation_params_len=1 and an inner length byte of up to 20 (NFC-A) or\n50 (NFC-B) causes memcpy() to read that many bytes past the one valid\nbyte in the activation params region -- a slab out-of-bounds read of\nkernel memory adjacent to the NCI skb.\n\nThe sibling nci_extract_rf_params_*() family was given equivalent\nprotection by commit 571dcbeb8e63 (\"net: nfc: nci: Fix parameter\nvalidation for packet data\"), but the two activation parameter\nextractors were not updated at that time.\n\nAdd a data_len parameter to both functions, guard against an empty\nregion before consuming the inner length byte, decrement the remaining\ncount after consuming it, and clamp the copy length to what is actually\navailable.  Update both call sites to pass ntf.activation_params_len,\nwhich is already validated against the skb at ntf.c:801.","Type":"Description","Title":"nfc: nci: add data_len bound checks to activation parameter extr"}]}}}