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—