CVE-2023-53192: In the Linux kernel, the following vulnerability has been resolved:  vxlan: Fix nexthop hash size  The nexthop code expects a 31 bit hash, such as what is returned by fib_multipath_hash() and rt6_multipath_hash(). Passing the 32 bit hash returned by skb_get_hash() can lead to problems related to the fact that 'int hash' is a negative number when the MSB is set.  In the case of hash threshold nexthop groups, nexthop_select_path_hthr() will disproportionately select the first nexthop group entry. In the case of resilient nexthop groups, nexthop_select_path_res() may do an out of bounds access in nh_buckets[], for example:     hash = -912054133     num_nh_buckets = 2     bucket_index = 65535  which leads to the following panic:  BUG: unable to handle page fault for address: ffffc900025910c8 PGD 100000067 P4D 100000067 PUD 10026b067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI CPU: 4 PID: 856 Comm: kworker/4:3 Not tainted 6.5.0-rc2+ #34 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:nexthop_select_path+0x197/0xbf0 Code: c1 e4 05 be 08 00 00 00 4c 8b 35 a4 14 7e 01 4e 8d 6c 25 00 4a 8d 7c 25 08 48 01 dd e8 c2 25 15 ff 49 8d 7d 08 e8 39 13 15 ff <4d> 89 75 08 48 89 ef e8 7d 12 15 ff 48 8b 5d 00 e8 14 55 2f 00 85 RSP: 0018:ffff88810c36f260 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000002000c0 RCX: ffffffffaf02dd77 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffc900025910c8 RBP: ffffc900025910c0 R08: 0000000000000001 R09: fffff520004b2219 R10: ffffc900025910cf R11: 31392d2068736168 R12: 00000000002000c0 R13: ffffc900025910c0 R14: 00000000fffef608 R15: ffff88811840e900 FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc900025910c8 CR3: 0000000129d00000 CR4: 0000000000750ee0 PKRU: 55555554 Call Trace:  <TASK>  ? __die+0x23/0x70  ? page_fault_oops+0x1ee/0x5c0  ? __pfx_is_prefetch.constprop.0+0x10/0x10  ? __pfx_page_fault_oops+0x10/0x10  ? search_bpf_extables+0xfe/0x1c0  ? fixup_exception+0x3b/0x470  ? exc_page_fault+0xf6/0x110  ? asm_exc_page_fault+0x26/0x30  ? nexthop_select_path+0x197/0xbf0  ? nexthop_select_path+0x197/0xbf0  ? lock_is_held_type+0xe7/0x140  vxlan_xmit+0x5b2/0x2340  ? __lock_acquire+0x92b/0x3370  ? __pfx_vxlan_xmit+0x10/0x10  ? __pfx___lock_acquire+0x10/0x10  ? __pfx_register_lock_class+0x10/0x10  ? skb_network_protocol+0xce/0x2d0  ? dev_hard_start_xmit+0xca/0x350  ? __pfx_vxlan_xmit+0x10/0x10  dev_hard_start_xmit+0xca/0x350  __dev_queue_xmit+0x513/0x1e20  ? __pfx___dev_queue_xmit+0x10/0x10  ? __pfx_lock_release+0x10/0x10  ? mark_held_locks+0x44/0x90  ? skb_push+0x4c/0x80  ? eth_header+0x81/0xe0  ? __pfx_eth_header+0x10/0x10  ? neigh_resolve_output+0x215/0x310  ? ip6_finish_output2+0x2ba/0xc90  ip6_finish_output2+0x2ba/0xc90  ? lock_release+0x236/0x3e0  ? ip6_mtu+0xbb/0x240  ? __pfx_ip6_finish_output2+0x10/0x10  ? find_held_lock+0x83/0xa0  ? lock_is_held_type+0xe7/0x140  ip6_finish_output+0x1ee/0x780  ip6_output+0x138/0x460  ? __pfx_ip6_output+0x10/0x10  ? __pfx___lock_acquire+0x10/0x10  ? __pfx_ip6_finish_output+0x10/0x10  NF_HOOK.constprop.0+0xc0/0x420  ? __pfx_NF_HOOK.constprop.0+0x10/0x10  ? ndisc_send_skb+0x2c0/0x960  ? __pfx_lock_release+0x10/0x10  ? __local_bh_enable_ip+0x93/0x110  ? lock_is_held_type+0xe7/0x140  ndisc_send_skb+0x4be/0x960  ? __pfx_ndisc_send_skb+0x10/0x10  ? mark_held_locks+0x65/0x90  ? find_held_lock+0x83/0xa0  ndisc_send_ns+0xb0/0x110  ? __pfx_ndisc_send_ns+0x10/0x10  addrconf_dad_work+0x631/0x8e0  ? lock_acquire+0x180/0x3f0  ? __pfx_addrconf_dad_work+0x10/0x10  ? mark_held_locks+0x24/0x90  process_one_work+0x582/0x9c0  ? __pfx_process_one_work+0x10/0x10  ? __pfx_do_raw_spin_lock+0x10/0x10  ? mark_held_locks+0x24/0x90  worker_thread+0x93/0x630  ? __kthread_parkme+0xdc/0x100  ? __pfx_worker_thread+0x10/0x10  kthread+0x1a5/0x1e0  ? __pfx_kthread+0x10/0x10  ret_from_fork+0x34/0x60   ---truncated---