CVE-2024-40961

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ipv6: prevent possible NULL deref in fib6_nh_init()<br /> <br /> syzbot reminds us that in6_dev_get() can return NULL.<br /> <br /> fib6_nh_init()<br /> ip6_validate_gw( &amp;idev )<br /> ip6_route_check_nh( idev )<br /> *idev = in6_dev_get(dev); // can be NULL<br /> <br /> Oops: general protection fault, probably for non-canonical address 0xdffffc00000000bc: 0000 [#1] PREEMPT SMP KASAN PTI<br /> KASAN: null-ptr-deref in range [0x00000000000005e0-0x00000000000005e7]<br /> CPU: 0 PID: 11237 Comm: syz-executor.3 Not tainted 6.10.0-rc2-syzkaller-00249-gbe27b8965297 #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024<br /> RIP: 0010:fib6_nh_init+0x640/0x2160 net/ipv6/route.c:3606<br /> 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 0f b6 04 38 84 c0 0f 85 b3 17 00 00 8b 1b 31 ff 89 de e8 b8 8b<br /> RSP: 0018:ffffc900032775a0 EFLAGS: 00010202<br /> RAX: 00000000000000bc RBX: 00000000000005e0 RCX: 0000000000000000<br /> RDX: 0000000000000010 RSI: ffffc90003277a54 RDI: ffff88802b3a08d8<br /> RBP: ffffc900032778b0 R08: 00000000000002fc R09: 0000000000000000<br /> R10: 00000000000002fc R11: 0000000000000000 R12: ffff88802b3a08b8<br /> R13: 1ffff9200064eec8 R14: ffffc90003277a00 R15: dffffc0000000000<br /> FS: 00007f940feb06c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 0000000000000000 CR3: 00000000245e8000 CR4: 00000000003506f0<br /> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<br /> Call Trace:<br /> <br /> ip6_route_info_create+0x99e/0x12b0 net/ipv6/route.c:3809<br /> ip6_route_add+0x28/0x160 net/ipv6/route.c:3853<br /> ipv6_route_ioctl+0x588/0x870 net/ipv6/route.c:4483<br /> inet6_ioctl+0x21a/0x280 net/ipv6/af_inet6.c:579<br /> sock_do_ioctl+0x158/0x460 net/socket.c:1222<br /> sock_ioctl+0x629/0x8e0 net/socket.c:1341<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:907 [inline]<br /> __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893<br /> do_syscall_x64 arch/x86/entry/common.c:52 [inline]<br /> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> RIP: 0033:0x7f940f07cea9