CVE-2024-26852: In the Linux kernel, the following vulnerability has been resolved:  net/ipv6: avoid possible UAF in ip6_route_mpath_notify()  syzbot found another use-after-free in ip6_route_mpath_notify() [1]  Commit f7225172f25a ("net/ipv6: prevent use after free in ip6_route_mpath_notify") was not able to fix the root cause.  We need to defer the fib6_info_release() calls after ip6_route_mpath_notify(), in the cleanup phase.  [1] BUG: KASAN: slab-use-after-free in rt6_fill_node+0x1460/0x1ac0 Read of size 4 at addr ffff88809a07fc64 by task syz-executor.2/23037  CPU: 0 PID: 23037 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-01035-gea7f3cfaa588 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace:  <TASK>   __dump_stack lib/dump_stack.c:88 [inline]   dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106   print_address_description mm/kasan/report.c:377 [inline]   print_report+0x167/0x540 mm/kasan/report.c:488   kasan_report+0x142/0x180 mm/kasan/report.c:601  rt6_fill_node+0x1460/0x1ac0   inet6_rt_notify+0x13b/0x290 net/ipv6/route.c:6184   ip6_route_mpath_notify net/ipv6/route.c:5198 [inline]   ip6_route_multipath_add net/ipv6/route.c:5404 [inline]   inet6_rtm_newroute+0x1d0f/0x2300 net/ipv6/route.c:5517   rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597   netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543   netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]   netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367   netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908   sock_sendmsg_nosec net/socket.c:730 [inline]   __sock_sendmsg+0x221/0x270 net/socket.c:745   ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584   ___sys_sendmsg net/socket.c:2638 [inline]   __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667  do_syscall_64+0xf9/0x240  entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f73dd87dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f73de6550c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f73dd9ac050 RCX: 00007f73dd87dda9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005 RBP: 00007f73dd8ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f73dd9ac050 R15: 00007ffdbdeb7858  </TASK>  Allocated by task 23037:   kasan_save_stack mm/kasan/common.c:47 [inline]   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68   poison_kmalloc_redzone mm/kasan/common.c:372 [inline]   __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389   kasan_kmalloc include/linux/kasan.h:211 [inline]   __do_kmalloc_node mm/slub.c:3981 [inline]   __kmalloc+0x22e/0x490 mm/slub.c:3994   kmalloc include/linux/slab.h:594 [inline]   kzalloc include/linux/slab.h:711 [inline]   fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155   ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3758   ip6_route_multipath_add net/ipv6/route.c:5298 [inline]   inet6_rtm_newroute+0x744/0x2300 net/ipv6/route.c:5517   rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597   netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543   netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]   netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367   netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908   sock_sendmsg_nosec net/socket.c:730 [inline]   __sock_sendmsg+0x221/0x270 net/socket.c:745   ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584   ___sys_sendmsg net/socket.c:2638 [inline]   __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667  do_syscall_64+0xf9/0x240  entry_SYSCALL_64_after_hwframe+0x6f/0x77  Freed by task 16:   kasan_save_stack mm/kasan/common.c:47 [inline]   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68   kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640   poison_slab_object+0xa6/0xe0 m ---truncated---