{"id":"CVE-2026-99008","summary":"Bluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown\n\nsyzbot hit a NULL pointer dereference in rfcomm_dev_shutdown() when an\nRFCOMM tty is closed.\n\nrfcomm_dev_add() puts the new device on rfcomm_dev_list first and only\nthen registers the tty device and saves it in dev-\u003etty_dev. If that\nregistration fails, dev-\u003etty_dev is never set at all. The device can be\nlooked up in the meantime, so an open() of /dev/rfcommN gets through\nrfcomm_tty_install() and attaches to it. When that tty is closed again,\nrfcomm_dev_shutdown() uses dev-\u003etty_dev without checking it:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]\n  RIP: 0010:rfcomm_dev_shutdown+0x48/0xb0 net/bluetooth/rfcomm/tty.c:131\n  Call Trace:\n   tty_port_shutdown+0x1bf/0x220 drivers/tty/tty_port.c:372\n   tty_port_close+0x4e/0x150 drivers/tty/tty_port.c:705\n   tty_release+0x359/0x1670 drivers/tty/tty_io.c:1718\n   __fput+0x418/0xa50 fs/file_table.c:512\n\nrfcomm_dev_destruct() already copes with a NULL dev-\u003etty_dev. Add the\nsame check to rfcomm_dev_shutdown(), so the tty device is only moved\nwhen it was actually registered.","modified":"2026-11-04T14:27:18.399416678Z","published":"2026-10-23T12:20:33.355Z","related":["SUSE-SU-2026:5091-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99008.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/08e90633377f1b2567ab5ad6810b74c552246a07"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3f6394f6c6d1b6817065d3b402f55d437063a704"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3fd5164bdb04635caa7942ddb554b0ec699a9433"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a43452d8c1015ac2f0e43ff946be5425427b02cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a661f401f83b8462f2d424e0a1a72b7681e92ea2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b2b915042be073637d9f93dc51ef15fc0685ae8a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0aef0b0374678153244f162df507106d728af39"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d5c372ad03330f02962d4860df4d355ab25487df"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99008.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99008"},{"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":"cad348a17e170451ea8688b532a6ca3e98c63b60"},{"fixed":"b2b915042be073637d9f93dc51ef15fc0685ae8a"},{"fixed":"a43452d8c1015ac2f0e43ff946be5425427b02cc"},{"fixed":"3f6394f6c6d1b6817065d3b402f55d437063a704"},{"fixed":"d5c372ad03330f02962d4860df4d355ab25487df"},{"fixed":"3fd5164bdb04635caa7942ddb554b0ec699a9433"},{"fixed":"a661f401f83b8462f2d424e0a1a72b7681e92ea2"},{"fixed":"d0aef0b0374678153244f162df507106d728af39"},{"fixed":"08e90633377f1b2567ab5ad6810b74c552246a07"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99008.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.12.0"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99008.json"}}],"schema_version":"1.9.2"}