{"id":"CVE-2026-43020","summary":"Bluetooth: MGMT: validate LTK enc_size on load","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: validate LTK enc_size on load\n\nLoad Long Term Keys stores the user-provided enc_size and later uses\nit to size fixed-size stack operations when replying to LE LTK\nrequests. An enc_size larger than the 16-byte key buffer can therefore\noverflow the reply stack buffer.\n\nReject oversized enc_size values while validating the management LTK\nrecord so invalid keys never reach the stored key state.","modified":"2026-05-18T06:00:12.158765466Z","published":"2026-05-01T14:15:23.699Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43020.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64"},{"type":"WEB","url":"https://git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009"},{"type":"WEB","url":"https://git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257"},{"type":"WEB","url":"https://git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43020.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43020"},{"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":"346af67b8d116f01ef696fd47959a55deb2db8b6"},{"fixed":"0f37d1e65c6d71ad94ccfb5c602163c525db789d"},{"fixed":"257cdb960d8ff6d60bb6461b03c814b6cf0c9e64"},{"fixed":"c34577f517b556fb6ca173d45bf7e766ae2564ce"},{"fixed":"f71695e81f4cb428f3c7e2138eae88199005b52c"},{"fixed":"82f342b3b006ca1d65f4890c05f2ec32fcb808b6"},{"fixed":"50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257"},{"fixed":"40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009"},{"fixed":"b8dbe9648d69059cfe3a28917bfbf7e61efd7f15"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43020.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.4.0"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.134"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.81"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.22"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43020.json"}}],"schema_version":"1.7.5"}