CVE-2024-40961

In the Linux kernel, the following vulnerability has been resolved:

ipv6: prevent possible NULL deref in fib6_nh_init()

syzbot reminds us that in6_dev_get() can return NULL.

fib6_nh_init()

ip6_validate_gw( &idev )

ip6_route_check_nh( idev )

*idev = in6_dev_get(dev); // can be NULL

Oops: general protection fault, probably for non-canonical address 0xdffffc00000000bc: 0000 [#1] PREEMPT SMP KASAN PTI

KASAN: null-ptr-deref in range [0x00000000000005e0-0x00000000000005e7]

CPU: 0 PID: 11237 Comm: syz-executor.3 Not tainted 6.10.0-rc2-syzkaller-00249-gbe27b8965297 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024

RIP: 0010:fib6_nh_init+0x640/0x2160 net/ipv6/route.c:3606

Code: 00 00 fc ff df 4c 8b 64 24 58 48 8b 44 24 28 4c 8b 74 24 30 48 89 c1 48 89 44 24 28 48 8d 98 e0 05 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 b3 17 00 00 8b 1b 31 ff 89 de e8 b8 8b

RSP: 0018:ffffc900032775a0 EFLAGS: 00010202

RAX: 00000000000000bc RBX: 00000000000005e0 RCX: 0000000000000000

RDX: 0000000000000010 RSI: ffffc90003277a54 RDI: ffff88802b3a08d8

RBP: ffffc900032778b0 R08: 00000000000002fc R09: 0000000000000000

R10: 00000000000002fc R11: 0000000000000000 R12: ffff88802b3a08b8

R13: 1ffff9200064eec8 R14: ffffc90003277a00 R15: dffffc0000000000

FS: 00007f940feb06c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000000000 CR3: 00000000245e8000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:

<TASK>

ip6_route_info_create+0x99e/0x12b0 net/ipv6/route.c:3809

ip6_route_add+0x28/0x160 net/ipv6/route.c:3853

ipv6_route_ioctl+0x588/0x870 net/ipv6/route.c:4483

inet6_ioctl+0x21a/0x280 net/ipv6/af_inet6.c:579

sock_do_ioctl+0x158/0x460 net/socket.c:1222

sock_ioctl+0x629/0x8e0 net/socket.c:1341

vfs_ioctl fs/ioctl.c:51 [inline]

__do_sys_ioctl fs/ioctl.c:907 [inline]

__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83

entry_SYSCALL_64_after_hwframe+0x77/0x7f

RIP: 0033:0x7f940f07cea9