{"id":"CVE-2026-31622","revision":"4897369798f94282a7c4291266702ff3","records":[{"revision":"4897369798f94282a7c4291266702ff3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31622","aliases":[],"title":"NFC: digital: Bounds check NFC-A cascade depth in SDD response handler","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFC: digital: Bounds check NFC-A cascade depth in SDD response handler\n\nThe NFC-A anti-collision cascade in digital_in_recv_sdd_res() appends 3\nor 4 bytes to target->nfcid1 on each round, but the number of cascade\nrounds is controlled entirely by the peer device.  The peer sets the\ncascade tag in the SDD_RES (deciding 3 vs 4 bytes) and the\ncascade-incomplete bit in the SEL_RES (deciding whether another round\nfollows).\n\nISO 14443-3 limits NFC-A to three cascade levels and target->nfcid1 is\nsized accordingly (NFC_NFCID1_MAXSIZE = 10), but nothing in the driver\nactually enforces this.  This means a malicious peer can keep the\ncascade running, writing past the heap-allocated nfc_target with each\nround.\n\nFix this by rejecting the response when the accumulated UID would exceed\nthe buffer.\n\nCommit e329e71013c9 (\"NFC: nci: Bounds check struct nfc_target arrays\")\nfixed similar missing checks against the same field on the NCI path.","state":0,"publishedAt":"2026-04-24T14:42:39.916+00:00","modifiedAt":"2026-10-15T01:17:15.197+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                        \"net/nfc/digital_technology.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2c66daecc4092e6049673c281b2e6f0d5e59a94c\",\n                            \"lessThan\": \"9ba6bb09e00b922d902f684f575779e5433fe6e3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2c66daecc4092e6049673c281b2e6f0d5e59a94c\",\n                            \"lessThan\": \"f83b399aa05a0712e3b1569a30d3d90b3533d2ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2c66daecc4092e6049673c281b2e6f0d5e59a94c\",\n                            \"lessThan\": \"20663102c14566e900e1d2f679e30b7f1694f387\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2c66daecc4092e6049673c281b2e6f0d5e59a94c\",\n                            \"lessThan\": \"2819f34e08bdffb6f06a51c67948ec5737fb166a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2c66daecc4092e6049673c281b2e6f0d5e59a94c\",\n                            \"lessThan\": \"1bec5698b55aa2be5c3b983dba657c01d0fd3dbc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2c66daecc4092e6049673c281b2e6f0d5e59a94c\",\n                            \"lessThan\": \"5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2c66daecc4092e6049673c281b2e6f0d5e59a94c\",\n                            \"lessThan\": \"8d9d9bf3565271ca7ab9c716a94e87296177e7ba\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2c66daecc4092e6049673c281b2e6f0d5e59a94c\",\n                            \"lessThan\": \"cc024a3de265ef6c58957f4990eccb9f806208cb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2c66daecc4092e6049673c281b2e6f0d5e59a94c\",\n                            \"lessThan\": \"46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1\",\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                        \"net/nfc/digital_technology.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.258\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.136\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.83\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.24\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.14\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.1\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9ba6bb09e00b922d902f684f575779e5433fe6e3","https://git.kernel.org/stable/c/f83b399aa05a0712e3b1569a30d3d90b3533d2ef","https://git.kernel.org/stable/c/20663102c14566e900e1d2f679e30b7f1694f387","https://git.kernel.org/stable/c/2819f34e08bdffb6f06a51c67948ec5737fb166a","https://git.kernel.org/stable/c/1bec5698b55aa2be5c3b983dba657c01d0fd3dbc","https://git.kernel.org/stable/c/5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1","https://git.kernel.org/stable/c/8d9d9bf3565271ca7ab9c716a94e87296177e7ba","https://git.kernel.org/stable/c/cc024a3de265ef6c58957f4990eccb9f806208cb","https://git.kernel.org/stable/c/46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31622","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31622","identifiers":["CVE-2026-31622"]},"retained":false,"historicalAffected":[]}],"coverage":[]}