{"id":"CVE-2026-80823","revision":"50235e66341844829489858ea1219241","records":[{"revision":"50235e66341844829489858ea1219241","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80823","aliases":[],"title":"nfc: st21nfca: validate ATR_REQ length against the received frame","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: st21nfca: validate ATR_REQ length against the received frame\n\nst21nfca_tm_recv_atr_req() checks that the received ATR_REQ frame is at\nleast ST21NFCA_ATR_REQ_MIN_SIZE and that the self-declared atr_req->length\nis at least sizeof(struct st21nfca_atr_req), but never checks that\natr_req->length does not exceed the actual received length (skb->len).\n\nst21nfca_tm_send_atr_res() then trusts the declared length:\n\n\tgb_len = atr_req->length - sizeof(struct st21nfca_atr_req);\n\t...\n\tmemcpy(atr_res->gbi, atr_req->gbi, gb_len);\n\nso an RF peer that sends a short frame but sets atr_req->length larger\nthan the frame makes gb_len exceed the general bytes actually present,\nand the memcpy reads out of bounds past the received skb. Those bytes are\nplaced in the ATR_RES and sent back to the peer (kernel-memory disclosure\nto a proximity attacker); a larger declared length is an out-of-bounds\nread (DoS).\n\nReject frames whose declared length exceeds the received length. The\nadjacent nfc_tm_activated() path in the same function already derives its\ngeneral-bytes length from skb->len rather than the declared field.\n\nFound by 0sec (https://0sec.ai) using automated source analysis; the\nmissing bound is evident from source. Compile-tested.","state":0,"publishedAt":"2026-09-04T15:27:46.153+00:00","modifiedAt":"2026-10-19T08:44:15.864+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/nfc/st21nfca/dep.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1892bf844ea0261736bd5e75546fc996e9daeedf\",\n                            \"lessThan\": \"785df00bb3ae3206674a43284eb06dac575b5c64\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1892bf844ea0261736bd5e75546fc996e9daeedf\",\n                            \"lessThan\": \"2c1ad291f4cdc357f9527b688c6fda9c6ffa7890\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1892bf844ea0261736bd5e75546fc996e9daeedf\",\n                            \"lessThan\": \"dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1892bf844ea0261736bd5e75546fc996e9daeedf\",\n                            \"lessThan\": \"9635507fe82949e429b3cd938876a9917125b151\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1892bf844ea0261736bd5e75546fc996e9daeedf\",\n                            \"lessThan\": \"0f344944c506b4f02d2b098489f7268b438c369e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1892bf844ea0261736bd5e75546fc996e9daeedf\",\n                            \"lessThan\": \"bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1892bf844ea0261736bd5e75546fc996e9daeedf\",\n                            \"lessThan\": \"304f5b414f4051d324b8c4a3ab0e79f7dc7e150e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1892bf844ea0261736bd5e75546fc996e9daeedf\",\n                            \"lessThan\": \"f33cecf69095c43be88567fef92b180b858f7369\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1892bf844ea0261736bd5e75546fc996e9daeedf\",\n                            \"lessThan\": \"5cdcca5d62a66eda6b774110a44cba67bc1a8d1d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/nfc/st21nfca/dep.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.267\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.218\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.185\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.154\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.106\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.47\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.11\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.1\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/785df00bb3ae3206674a43284eb06dac575b5c64","https://git.kernel.org/stable/c/2c1ad291f4cdc357f9527b688c6fda9c6ffa7890","https://git.kernel.org/stable/c/dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa","https://git.kernel.org/stable/c/9635507fe82949e429b3cd938876a9917125b151","https://git.kernel.org/stable/c/0f344944c506b4f02d2b098489f7268b438c369e","https://git.kernel.org/stable/c/bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d","https://git.kernel.org/stable/c/304f5b414f4051d324b8c4a3ab0e79f7dc7e150e","https://git.kernel.org/stable/c/f33cecf69095c43be88567fef92b180b858f7369","https://git.kernel.org/stable/c/5cdcca5d62a66eda6b774110a44cba67bc1a8d1d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80823","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80823","identifiers":["CVE-2026-80823"]},"retained":false,"historicalAffected":[]}],"coverage":[]}