{"id":"CVE-2024-49950","summary":"Bluetooth: L2CAP: Fix uaf in l2cap_connect","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix uaf in l2cap_connect\n\n[Syzbot reported]\nBUG: KASAN: slab-use-after-free in l2cap_connect.constprop.0+0x10d8/0x1270 net/bluetooth/l2cap_core.c:3949\nRead of size 8 at addr ffff8880241e9800 by task kworker/u9:0/54\n\nCPU: 0 UID: 0 PID: 54 Comm: kworker/u9:0 Not tainted 6.11.0-rc6-syzkaller-00268-g788220eee30d #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nWorkqueue: hci2 hci_rx_work\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:93 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n l2cap_connect.constprop.0+0x10d8/0x1270 net/bluetooth/l2cap_core.c:3949\n l2cap_connect_req net/bluetooth/l2cap_core.c:4080 [inline]\n l2cap_bredr_sig_cmd net/bluetooth/l2cap_core.c:4772 [inline]\n l2cap_sig_channel net/bluetooth/l2cap_core.c:5543 [inline]\n l2cap_recv_frame+0xf0b/0x8eb0 net/bluetooth/l2cap_core.c:6825\n l2cap_recv_acldata+0x9b4/0xb70 net/bluetooth/l2cap_core.c:7514\n hci_acldata_packet net/bluetooth/hci_core.c:3791 [inline]\n hci_rx_work+0xaab/0x1610 net/bluetooth/hci_core.c:4028\n process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231\n process_scheduled_works kernel/workqueue.c:3312 [inline]\n worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389\n kthread+0x2c1/0x3a0 kernel/kthread.c:389\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n...\n\nFreed by task 5245:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:47\n kasan_save_track+0x14/0x30 mm/kasan/common.c:68\n kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579\n poison_slab_object+0xf7/0x160 mm/kasan/common.c:240\n __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256\n kasan_slab_free include/linux/kasan.h:184 [inline]\n slab_free_hook mm/slub.c:2256 [inline]\n slab_free mm/slub.c:4477 [inline]\n kfree+0x12a/0x3b0 mm/slub.c:4598\n l2cap_conn_free net/bluetooth/l2cap_core.c:1810 [inline]\n kref_put include/linux/kref.h:65 [inline]\n l2cap_conn_put net/bluetooth/l2cap_core.c:1822 [inline]\n l2cap_conn_del+0x59d/0x730 net/bluetooth/l2cap_core.c:1802\n l2cap_connect_cfm+0x9e6/0xf80 net/bluetooth/l2cap_core.c:7241\n hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline]\n hci_conn_failed+0x1c3/0x370 net/bluetooth/hci_conn.c:1265\n hci_abort_conn_sync+0x75a/0xb50 net/bluetooth/hci_sync.c:5583\n abort_conn_sync+0x197/0x360 net/bluetooth/hci_conn.c:2917\n hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:328\n process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231\n process_scheduled_works kernel/workqueue.c:3312 [inline]\n worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389\n kthread+0x2c1/0x3a0 kernel/kthread.c:389\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244","modified":"2026-04-02T12:21:09.685048Z","published":"2024-10-21T18:02:06.387Z","related":["MGASA-2024-0344","MGASA-2024-0345","SUSE-SU-2024:3984-1","SUSE-SU-2024:3986-1","SUSE-SU-2024:4315-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4364-1","SUSE-SU-2024:4367-1","SUSE-SU-2024:4376-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:0035-1","SUSE-SU-2025:0784-1","SUSE-SU-2025:0834-1","SUSE-SU-2025:0847-1","SUSE-SU-2025:0856-1","SUSE-SU-2025:0955-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20190-1","SUSE-SU-2025:20192-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","SUSE-SU-2025:20260-1","SUSE-SU-2025:20270-1","USN-7276-1","USN-7277-1","openSUSE-SU-2024:14500-1","openSUSE-SU-2025:14705-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49950.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/333b4fd11e89b29c84c269123f871883a30be586"},{"type":"WEB","url":"https://git.kernel.org/stable/c/686e05c9dbd68766c6bda5f31f7e077f36a7fb29"},{"type":"WEB","url":"https://git.kernel.org/stable/c/78d30ce16fdf9c301bcd8b83ce613cea079cea83"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a1c6174e23df10b8e5770e82d63bc6e2118a3dc7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b22346eec479a30bfa4a02ad2c551b54809694d0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b90907696c30172b809aa3dd2f0caffae761e4c6"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49950.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-49950"},{"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":"7b064edae38d62d8587a8c574f93b53ce75ae749"},{"fixed":"686e05c9dbd68766c6bda5f31f7e077f36a7fb29"},{"fixed":"b22346eec479a30bfa4a02ad2c551b54809694d0"},{"fixed":"b90907696c30172b809aa3dd2f0caffae761e4c6"},{"fixed":"78d30ce16fdf9c301bcd8b83ce613cea079cea83"},{"fixed":"a1c6174e23df10b8e5770e82d63bc6e2118a3dc7"},{"fixed":"333b4fd11e89b29c84c269123f871883a30be586"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-49950.json"}}],"schema_version":"1.7.5"}