CVE-2023-52637: In the Linux kernel, the following vulnerability has been resolved:  can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER)  Lock jsk->sk to prevent UAF when setsockopt(..., SO_J1939_FILTER, ...) modifies jsk->filters while receiving packets.  Following trace was seen on affected system:  ==================================================================  BUG: KASAN: slab-use-after-free in j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]  Read of size 4 at addr ffff888012144014 by task j1939/350   CPU: 0 PID: 350 Comm: j1939 Tainted: G        W  OE      6.5.0-rc5 #1  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014  Call Trace:   print_report+0xd3/0x620   ? kasan_complete_mode_report_info+0x7d/0x200   ? j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]   kasan_report+0xc2/0x100   ? j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]   __asan_load4+0x84/0xb0   j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]   j1939_sk_recv+0x20b/0x320 [can_j1939]   ? __kasan_check_write+0x18/0x20   ? __pfx_j1939_sk_recv+0x10/0x10 [can_j1939]   ? j1939_simple_recv+0x69/0x280 [can_j1939]   ? j1939_ac_recv+0x5e/0x310 [can_j1939]   j1939_can_recv+0x43f/0x580 [can_j1939]   ? __pfx_j1939_can_recv+0x10/0x10 [can_j1939]   ? raw_rcv+0x42/0x3c0 [can_raw]   ? __pfx_j1939_can_recv+0x10/0x10 [can_j1939]   can_rcv_filter+0x11f/0x350 [can]   can_receive+0x12f/0x190 [can]   ? __pfx_can_rcv+0x10/0x10 [can]   can_rcv+0xdd/0x130 [can]   ? __pfx_can_rcv+0x10/0x10 [can]   __netif_receive_skb_one_core+0x13d/0x150   ? __pfx___netif_receive_skb_one_core+0x10/0x10   ? __kasan_check_write+0x18/0x20   ? _raw_spin_lock_irq+0x8c/0xe0   __netif_receive_skb+0x23/0xb0   process_backlog+0x107/0x260   __napi_poll+0x69/0x310   net_rx_action+0x2a1/0x580   ? __pfx_net_rx_action+0x10/0x10   ? __pfx__raw_spin_lock+0x10/0x10   ? handle_irq_event+0x7d/0xa0   __do_softirq+0xf3/0x3f8   do_softirq+0x53/0x80   </IRQ>   <TASK>   __local_bh_enable_ip+0x6e/0x70   netif_rx+0x16b/0x180   can_send+0x32b/0x520 [can]   ? __pfx_can_send+0x10/0x10 [can]   ? __check_object_size+0x299/0x410   raw_sendmsg+0x572/0x6d0 [can_raw]   ? __pfx_raw_sendmsg+0x10/0x10 [can_raw]   ? apparmor_socket_sendmsg+0x2f/0x40   ? __pfx_raw_sendmsg+0x10/0x10 [can_raw]   sock_sendmsg+0xef/0x100   sock_write_iter+0x162/0x220   ? __pfx_sock_write_iter+0x10/0x10   ? __rtnl_unlock+0x47/0x80   ? security_file_permission+0x54/0x320   vfs_write+0x6ba/0x750   ? __pfx_vfs_write+0x10/0x10   ? __fget_light+0x1ca/0x1f0   ? __rcu_read_unlock+0x5b/0x280   ksys_write+0x143/0x170   ? __pfx_ksys_write+0x10/0x10   ? __kasan_check_read+0x15/0x20   ? fpregs_assert_state_consistent+0x62/0x70   __x64_sys_write+0x47/0x60   do_syscall_64+0x60/0x90   ? do_syscall_64+0x6d/0x90   ? irqentry_exit+0x3f/0x50   ? exc_page_fault+0x79/0xf0   entry_SYSCALL_64_after_hwframe+0x6e/0xd8   Allocated by task 348:   kasan_save_stack+0x2a/0x50   kasan_set_track+0x29/0x40   kasan_save_alloc_info+0x1f/0x30   __kasan_kmalloc+0xb5/0xc0   __kmalloc_node_track_caller+0x67/0x160   j1939_sk_setsockopt+0x284/0x450 [can_j1939]   __sys_setsockopt+0x15c/0x2f0   __x64_sys_setsockopt+0x6b/0x80   do_syscall_64+0x60/0x90   entry_SYSCALL_64_after_hwframe+0x6e/0xd8   Freed by task 349:   kasan_save_stack+0x2a/0x50   kasan_set_track+0x29/0x40   kasan_save_free_info+0x2f/0x50   __kasan_slab_free+0x12e/0x1c0   __kmem_cache_free+0x1b9/0x380   kfree+0x7a/0x120   j1939_sk_setsockopt+0x3b2/0x450 [can_j1939]   __sys_setsockopt+0x15c/0x2f0   __x64_sys_setsockopt+0x6b/0x80   do_syscall_64+0x60/0x90   entry_SYSCALL_64_after_hwframe+0x6e/0xd8