CVE-2022-49505

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> NFC: NULL out the dev-&gt;rfkill to prevent UAF<br /> <br /> Commit 3e3b5dfcd16a ("NFC: reorder the logic in nfc_{un,}register_device")<br /> assumes the device_is_registered() in function nfc_dev_up() will help<br /> to check when the rfkill is unregistered. However, this check only<br /> take effect when device_del(&amp;dev-&gt;dev) is done in nfc_unregister_device().<br /> Hence, the rfkill object is still possible be dereferenced.<br /> <br /> The crash trace in latest kernel (5.18-rc2):<br /> <br /> [ 68.760105] ==================================================================<br /> [ 68.760330] BUG: KASAN: use-after-free in __lock_acquire+0x3ec1/0x6750<br /> [ 68.760756] Read of size 8 at addr ffff888009c93018 by task fuzz/313<br /> [ 68.760756]<br /> [ 68.760756] CPU: 0 PID: 313 Comm: fuzz Not tainted 5.18.0-rc2 #4<br /> [ 68.760756] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014<br /> [ 68.760756] Call Trace:<br /> [ 68.760756] <br /> [ 68.760756] dump_stack_lvl+0x57/0x7d<br /> [ 68.760756] print_report.cold+0x5e/0x5db<br /> [ 68.760756] ? __lock_acquire+0x3ec1/0x6750<br /> [ 68.760756] kasan_report+0xbe/0x1c0<br /> [ 68.760756] ? __lock_acquire+0x3ec1/0x6750<br /> [ 68.760756] __lock_acquire+0x3ec1/0x6750<br /> [ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410<br /> [ 68.760756] ? register_lock_class+0x18d0/0x18d0<br /> [ 68.760756] lock_acquire+0x1ac/0x4f0<br /> [ 68.760756] ? rfkill_blocked+0xe/0x60<br /> [ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410<br /> [ 68.760756] ? mutex_lock_io_nested+0x12c0/0x12c0<br /> [ 68.760756] ? nla_get_range_signed+0x540/0x540<br /> [ 68.760756] ? _raw_spin_lock_irqsave+0x4e/0x50<br /> [ 68.760756] _raw_spin_lock_irqsave+0x39/0x50<br /> [ 68.760756] ? rfkill_blocked+0xe/0x60<br /> [ 68.760756] rfkill_blocked+0xe/0x60<br /> [ 68.760756] nfc_dev_up+0x84/0x260<br /> [ 68.760756] nfc_genl_dev_up+0x90/0xe0<br /> [ 68.760756] genl_family_rcv_msg_doit+0x1f4/0x2f0<br /> [ 68.760756] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x230/0x230<br /> [ 68.760756] ? security_capable+0x51/0x90<br /> [ 68.760756] genl_rcv_msg+0x280/0x500<br /> [ 68.760756] ? genl_get_cmd+0x3c0/0x3c0<br /> [ 68.760756] ? lock_acquire+0x1ac/0x4f0<br /> [ 68.760756] ? nfc_genl_dev_down+0xe0/0xe0<br /> [ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410<br /> [ 68.760756] netlink_rcv_skb+0x11b/0x340<br /> [ 68.760756] ? genl_get_cmd+0x3c0/0x3c0<br /> [ 68.760756] ? netlink_ack+0x9c0/0x9c0<br /> [ 68.760756] ? netlink_deliver_tap+0x136/0xb00<br /> [ 68.760756] genl_rcv+0x1f/0x30<br /> [ 68.760756] netlink_unicast+0x430/0x710<br /> [ 68.760756] ? memset+0x20/0x40<br /> [ 68.760756] ? netlink_attachskb+0x740/0x740<br /> [ 68.760756] ? __build_skb_around+0x1f4/0x2a0<br /> [ 68.760756] netlink_sendmsg+0x75d/0xc00<br /> [ 68.760756] ? netlink_unicast+0x710/0x710<br /> [ 68.760756] ? netlink_unicast+0x710/0x710<br /> [ 68.760756] sock_sendmsg+0xdf/0x110<br /> [ 68.760756] __sys_sendto+0x19e/0x270<br /> [ 68.760756] ? __ia32_sys_getpeername+0xa0/0xa0<br /> [ 68.760756] ? fd_install+0x178/0x4c0<br /> [ 68.760756] ? fd_install+0x195/0x4c0<br /> [ 68.760756] ? kernel_fpu_begin_mask+0x1c0/0x1c0<br /> [ 68.760756] __x64_sys_sendto+0xd8/0x1b0<br /> [ 68.760756] ? lockdep_hardirqs_on+0xbf/0x130<br /> [ 68.760756] ? syscall_enter_from_user_mode+0x1d/0x50<br /> [ 68.760756] do_syscall_64+0x3b/0x90<br /> [ 68.760756] entry_SYSCALL_64_after_hwframe+0x44/0xae<br /> [ 68.760756] RIP: 0033:0x7f67fb50e6b3<br /> ...<br /> [ 68.760756] RSP: 002b:00007f67fa91fe90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c<br /> [ 68.760756] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f67fb50e6b3<br /> [ 68.760756] RDX: 000000000000001c RSI: 0000559354603090 RDI: 0000000000000003<br /> [ 68.760756] RBP: 00007f67fa91ff00 R08: 00007f67fa91fedc R09: 000000000000000c<br /> [ 68.760756] R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffe824d496e<br /> [ 68.760756] R13: 00007ffe824d496f R14: 00007f67fa120000 R15: 0000000000000003<br /> <br /> [ 68.760756] <br /> [ 68.760756]<br /> [ 68.760756] Allocated by task 279:<br /> [ 68.760756] kasan_save_stack+0x1e/0x40<br /> [<br /> ---truncated---