CVE-2022-49111

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Bluetooth: Fix use after free in hci_send_acl<br /> <br /> This fixes the following trace caused by receiving<br /> HCI_EV_DISCONN_PHY_LINK_COMPLETE which does call hci_conn_del without<br /> first checking if conn-&gt;type is in fact AMP_LINK and in case it is<br /> do properly cleanup upper layers with hci_disconn_cfm:<br /> <br /> ==================================================================<br /> BUG: KASAN: use-after-free in hci_send_acl+0xaba/0xc50<br /> Read of size 8 at addr ffff88800e404818 by task bluetoothd/142<br /> <br /> CPU: 0 PID: 142 Comm: bluetoothd Not tainted<br /> 5.17.0-rc5-00006-gda4022eeac1a #7<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS<br /> rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x45/0x59<br /> print_address_description.constprop.0+0x1f/0x150<br /> kasan_report.cold+0x7f/0x11b<br /> hci_send_acl+0xaba/0xc50<br /> l2cap_do_send+0x23f/0x3d0<br /> l2cap_chan_send+0xc06/0x2cc0<br /> l2cap_sock_sendmsg+0x201/0x2b0<br /> sock_sendmsg+0xdc/0x110<br /> sock_write_iter+0x20f/0x370<br /> do_iter_readv_writev+0x343/0x690<br /> do_iter_write+0x132/0x640<br /> vfs_writev+0x198/0x570<br /> do_writev+0x202/0x280<br /> do_syscall_64+0x38/0x90<br /> entry_SYSCALL_64_after_hwframe+0x44/0xae<br /> RSP: 002b:00007ffce8a099b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014<br /> Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3<br /> 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 14 00 00 00 0f 05<br /> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10<br /> RDX: 0000000000000001 RSI: 00007ffce8a099e0 RDI: 0000000000000015<br /> RAX: ffffffffffffffda RBX: 00007ffce8a099e0 RCX: 00007f788fc3cf77<br /> R10: 00007ffce8af7080 R11: 0000000000000246 R12: 000055e4ccf75580<br /> RBP: 0000000000000015 R08: 0000000000000002 R09: 0000000000000001<br /> <br /> R13: 000055e4ccf754a0 R14: 000055e4ccf75cd0 R15: 000055e4ccf4a6b0<br /> <br /> Allocated by task 45:<br /> kasan_save_stack+0x1e/0x40<br /> __kasan_kmalloc+0x81/0xa0<br /> hci_chan_create+0x9a/0x2f0<br /> l2cap_conn_add.part.0+0x1a/0xdc0<br /> l2cap_connect_cfm+0x236/0x1000<br /> le_conn_complete_evt+0x15a7/0x1db0<br /> hci_le_conn_complete_evt+0x226/0x2c0<br /> hci_le_meta_evt+0x247/0x450<br /> hci_event_packet+0x61b/0xe90<br /> hci_rx_work+0x4d5/0xc50<br /> process_one_work+0x8fb/0x15a0<br /> worker_thread+0x576/0x1240<br /> kthread+0x29d/0x340<br /> ret_from_fork+0x1f/0x30<br /> <br /> Freed by task 45:<br /> kasan_save_stack+0x1e/0x40<br /> kasan_set_track+0x21/0x30<br /> kasan_set_free_info+0x20/0x30<br /> __kasan_slab_free+0xfb/0x130<br /> kfree+0xac/0x350<br /> hci_conn_cleanup+0x101/0x6a0<br /> hci_conn_del+0x27e/0x6c0<br /> hci_disconn_phylink_complete_evt+0xe0/0x120<br /> hci_event_packet+0x812/0xe90<br /> hci_rx_work+0x4d5/0xc50<br /> process_one_work+0x8fb/0x15a0<br /> worker_thread+0x576/0x1240<br /> kthread+0x29d/0x340<br /> ret_from_fork+0x1f/0x30<br /> <br /> The buggy address belongs to the object at ffff88800c0f0500<br /> The buggy address is located 24 bytes inside of<br /> which belongs to the cache kmalloc-128 of size 128<br /> The buggy address belongs to the page:<br /> 128-byte region [ffff88800c0f0500, ffff88800c0f0580)<br /> flags: 0x100000000000200(slab|node=0|zone=1)<br /> page:00000000fe45cd86 refcount:1 mapcount:0<br /> mapping:0000000000000000 index:0x0 pfn:0xc0f0<br /> raw: 0000000000000000 0000000080100010 00000001ffffffff<br /> 0000000000000000<br /> raw: 0100000000000200 ffffea00003a2c80 dead000000000004<br /> ffff8880078418c0<br /> page dumped because: kasan: bad access detected<br /> ffff88800c0f0400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc<br /> Memory state around the buggy address:<br /> &gt;ffff88800c0f0500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb<br /> ffff88800c0f0480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc<br /> ffff88800c0f0580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc<br /> <br /> ---truncated---