{"id":"CVE-2022-48947","summary":"Bluetooth: L2CAP: Fix u8 overflow","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix u8 overflow\n\nBy keep sending L2CAP_CONF_REQ packets, chan-\u003enum_conf_rsp increases\nmultiple times and eventually it will wrap around the maximum number\n(i.e., 255).\nThis patch prevents this by adding a boundary check with\nL2CAP_MAX_CONF_RSP\n\nBtmon log:\nBluetooth monitor ver 5.64\n= Note: Linux version 6.1.0-rc2 (x86_64)                               0.264594\n= Note: Bluetooth subsystem version 2.22                               0.264636\n@ MGMT Open: btmon (privileged) version 1.22                  {0x0001} 0.272191\n= New Index: 00:00:00:00:00:00 (Primary,Virtual,hci0)          [hci0] 13.877604\n@ RAW Open: 9496 (privileged) version 2.22                   {0x0002} 13.890741\n= Open Index: 00:00:00:00:00:00                                [hci0] 13.900426\n(...)\n\u003e ACL Data RX: Handle 200 flags 0x00 dlen 1033             #32 [hci0] 14.273106\n        invalid packet size (12 != 1033)\n        08 00 01 00 02 01 04 00 01 10 ff ff              ............\n\u003e ACL Data RX: Handle 200 flags 0x00 dlen 1547             #33 [hci0] 14.273561\n        invalid packet size (14 != 1547)\n        0a 00 01 00 04 01 06 00 40 00 00 00 00 00        ........@.....\n\u003e ACL Data RX: Handle 200 flags 0x00 dlen 2061             #34 [hci0] 14.274390\n        invalid packet size (16 != 2061)\n        0c 00 01 00 04 01 08 00 40 00 00 00 00 00 00 04  ........@.......\n\u003e ACL Data RX: Handle 200 flags 0x00 dlen 2061             #35 [hci0] 14.274932\n        invalid packet size (16 != 2061)\n        0c 00 01 00 04 01 08 00 40 00 00 00 07 00 03 00  ........@.......\n= bluetoothd: Bluetooth daemon 5.43                                   14.401828\n\u003e ACL Data RX: Handle 200 flags 0x00 dlen 1033             #36 [hci0] 14.275753\n        invalid packet size (12 != 1033)\n        08 00 01 00 04 01 04 00 40 00 00 00              ........@...","modified":"2026-03-20T12:22:02.478373Z","published":"2024-10-21T20:05:36.491Z","related":["SUSE-SU-2024:3983-1","SUSE-SU-2024:3985-1","SUSE-SU-2024:4081-1","SUSE-SU-2024:4082-1","SUSE-SU-2024:4103-1","SUSE-SU-2024:4131-1","SUSE-SU-2024:4140-1","SUSE-SU-2024:4364-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48947.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/19a78143961a197de8502f4f29c453b913dc3c29"},{"type":"WEB","url":"https://git.kernel.org/stable/c/49d5867819ab7c744852b45509e8469839c07e0e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5550bbf709c323194881737fd290c4bada9e6ead"},{"type":"WEB","url":"https://git.kernel.org/stable/c/95f1847a361c7b4bf7d74c06ecb6968455082c1a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9fdc79b571434af7bc742da40a3405f038b637a7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad528fde0702903208d0a79d88d5a42ae3fc235b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bcd70260ef56e0aee8a4fc6cd214a419900b0765"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f3fe6817156a2ad4b06f01afab04638a34d7c9a6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48947.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-48947"},{"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":"f2fcfcd670257236ebf2088bbdf26f6a8ef459fe"},{"fixed":"49d5867819ab7c744852b45509e8469839c07e0e"},{"fixed":"95f1847a361c7b4bf7d74c06ecb6968455082c1a"},{"fixed":"ad528fde0702903208d0a79d88d5a42ae3fc235b"},{"fixed":"9fdc79b571434af7bc742da40a3405f038b637a7"},{"fixed":"f3fe6817156a2ad4b06f01afab04638a34d7c9a6"},{"fixed":"19a78143961a197de8502f4f29c453b913dc3c29"},{"fixed":"5550bbf709c323194881737fd290c4bada9e6ead"},{"fixed":"bcd70260ef56e0aee8a4fc6cd214a419900b0765"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48947.json"}}],"schema_version":"1.7.5"}