{"id":"CVE-2026-89583","summary":"Bluetooth: eir: Fix OOB read in eir_get_service_data()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: eir: Fix OOB read in eir_get_service_data()\n\neir_get_service_data() walks the advertising data for a Service Data\nfield with a matching UUID.  On a mismatch it advances:\n\n    eir += dlen;\n    eir_len -= dlen;\n\neir_get_data() reports dlen as the field's data length, but the field\nspans dlen + 2 bytes once its length and type bytes count, and more\nwhen non-Service-Data fields were skipped to reach it.  The pointer\nlands correctly on the next field.  eir_len does not, and the shortfall\ncompounds across fields until eir_get_data() reads the length and type\nbytes of a \"field\" past the end of the buffer.\n\nFor an ISO broadcast sink that buffer is hcon-\u003ele_per_adv_data[], filled\nfrom the periodic advertising reports of a remote broadcaster.  A PA\npayload packed with mismatching Service Data fields walks off the array\ninto the rest of struct hci_conn.  A drifted field that matches the BAA\nUUID puts those bytes in iso_pi(sk)-\u003ebase, where user space reads them\nback with getsockopt(BT_ISO_BASE).\n\nRecompute eir_len from the end of the buffer each iteration.","modified":"2026-09-13T03:47:19.417786573Z","published":"2026-09-11T19:44:49.094Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89583.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4beb198bc59b242404a47c21990bc84165052c8a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/815fc98c227a78cbd93d4c29f2833705b7c2bc0f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bb56e97bd67614238c1c0a4084704ccadbb875b4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89583.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89583"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8f9ae5b3ae80f168a6224529e3787f4fb27f299a"},{"fixed":"815fc98c227a78cbd93d4c29f2833705b7c2bc0f"},{"fixed":"c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50"},{"fixed":"bb56e97bd67614238c1c0a4084704ccadbb875b4"},{"fixed":"4beb198bc59b242404a47c21990bc84165052c8a"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89583.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.19.0"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89583.json"}}],"schema_version":"1.9.0"}