CVE-2024-44999

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> gtp: pull network headers in gtp_dev_xmit()<br /> <br /> syzbot/KMSAN reported use of uninit-value in get_dev_xmit() [1]<br /> <br /> We must make sure the IPv4 or Ipv6 header is pulled in skb-&gt;head<br /> before accessing fields in them.<br /> <br /> Use pskb_inet_may_pull() to fix this issue.<br /> <br /> [1]<br /> BUG: KMSAN: uninit-value in ipv6_pdp_find drivers/net/gtp.c:220 [inline]<br /> BUG: KMSAN: uninit-value in gtp_build_skb_ip6 drivers/net/gtp.c:1229 [inline]<br /> BUG: KMSAN: uninit-value in gtp_dev_xmit+0x1424/0x2540 drivers/net/gtp.c:1281<br /> ipv6_pdp_find drivers/net/gtp.c:220 [inline]<br /> gtp_build_skb_ip6 drivers/net/gtp.c:1229 [inline]<br /> gtp_dev_xmit+0x1424/0x2540 drivers/net/gtp.c:1281<br /> __netdev_start_xmit include/linux/netdevice.h:4913 [inline]<br /> netdev_start_xmit include/linux/netdevice.h:4922 [inline]<br /> xmit_one net/core/dev.c:3580 [inline]<br /> dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3596<br /> __dev_queue_xmit+0x358c/0x5610 net/core/dev.c:4423<br /> dev_queue_xmit include/linux/netdevice.h:3105 [inline]<br /> packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276<br /> packet_snd net/packet/af_packet.c:3145 [inline]<br /> packet_sendmsg+0x90e3/0xa3a0 net/packet/af_packet.c:3177<br /> sock_sendmsg_nosec net/socket.c:730 [inline]<br /> __sock_sendmsg+0x30f/0x380 net/socket.c:745<br /> __sys_sendto+0x685/0x830 net/socket.c:2204<br /> __do_sys_sendto net/socket.c:2216 [inline]<br /> __se_sys_sendto net/socket.c:2212 [inline]<br /> __x64_sys_sendto+0x125/0x1d0 net/socket.c:2212<br /> x64_sys_call+0x3799/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:45<br /> do_syscall_x64 arch/x86/entry/common.c:52 [inline]<br /> do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> Uninit was created at:<br /> slab_post_alloc_hook mm/slub.c:3994 [inline]<br /> slab_alloc_node mm/slub.c:4037 [inline]<br /> kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4080<br /> kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:583<br /> __alloc_skb+0x363/0x7b0 net/core/skbuff.c:674<br /> alloc_skb include/linux/skbuff.h:1320 [inline]<br /> alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6526<br /> sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2815<br /> packet_alloc_skb net/packet/af_packet.c:2994 [inline]<br /> packet_snd net/packet/af_packet.c:3088 [inline]<br /> packet_sendmsg+0x749c/0xa3a0 net/packet/af_packet.c:3177<br /> sock_sendmsg_nosec net/socket.c:730 [inline]<br /> __sock_sendmsg+0x30f/0x380 net/socket.c:745<br /> __sys_sendto+0x685/0x830 net/socket.c:2204<br /> __do_sys_sendto net/socket.c:2216 [inline]<br /> __se_sys_sendto net/socket.c:2212 [inline]<br /> __x64_sys_sendto+0x125/0x1d0 net/socket.c:2212<br /> x64_sys_call+0x3799/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:45<br /> do_syscall_x64 arch/x86/entry/common.c:52 [inline]<br /> do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> CPU: 0 UID: 0 PID: 7115 Comm: syz.1.515 Not tainted 6.11.0-rc1-syzkaller-00043-g94ede2a3e913 #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024