CVE-2024-26641: In the Linux kernel, the following vulnerability has been resolved:  ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()  syzbot found __ip6_tnl_rcv() could access unitiliazed data [1].  Call pskb_inet_may_pull() to fix this, and initialize ipv6h variable after this call as it can change skb->head.  [1]  BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]  BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]  BUG: KMSAN: uninit-value in IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321   __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]   INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]   IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321   ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727   __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845   ip6_tnl_rcv+0xce/0x100 net/ipv6/ip6_tunnel.c:888  gre_rcv+0x143f/0x1870   ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438   ip6_input_finish net/ipv6/ip6_input.c:483 [inline]   NF_HOOK include/linux/netfilter.h:314 [inline]   ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492   ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586   dst_input include/net/dst.h:461 [inline]   ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79   NF_HOOK include/linux/netfilter.h:314 [inline]   ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310   __netif_receive_skb_one_core net/core/dev.c:5532 [inline]   __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5646   netif_receive_skb_internal net/core/dev.c:5732 [inline]   netif_receive_skb+0x58/0x660 net/core/dev.c:5791   tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555   tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002   tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048   call_write_iter include/linux/fs.h:2084 [inline]   new_sync_write fs/read_write.c:497 [inline]   vfs_write+0x786/0x1200 fs/read_write.c:590   ksys_write+0x20f/0x4c0 fs/read_write.c:643   __do_sys_write fs/read_write.c:655 [inline]   __se_sys_write fs/read_write.c:652 [inline]   __x64_sys_write+0x93/0xd0 fs/read_write.c:652   do_syscall_x64 arch/x86/entry/common.c:52 [inline]   do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83  entry_SYSCALL_64_after_hwframe+0x63/0x6b  Uninit was created at:   slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768   slab_alloc_node mm/slub.c:3478 [inline]   kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523   kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560   __alloc_skb+0x318/0x740 net/core/skbuff.c:651   alloc_skb include/linux/skbuff.h:1286 [inline]   alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334   sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787   tun_alloc_skb drivers/net/tun.c:1531 [inline]   tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846   tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048   call_write_iter include/linux/fs.h:2084 [inline]   new_sync_write fs/read_write.c:497 [inline]   vfs_write+0x786/0x1200 fs/read_write.c:590   ksys_write+0x20f/0x4c0 fs/read_write.c:643   __do_sys_write fs/read_write.c:655 [inline]   __se_sys_write fs/read_write.c:652 [inline]   __x64_sys_write+0x93/0xd0 fs/read_write.c:652   do_syscall_x64 arch/x86/entry/common.c:52 [inline]   do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83  entry_SYSCALL_64_after_hwframe+0x63/0x6b  CPU: 0 PID: 5034 Comm: syz-executor331 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023