{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43456",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-43456"
  ],
  "published": "2026-05-08T14:22:57Z",
  "summary": "bonding: fix type confusion in bond_setup_by_slave()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: fix type confusion in bond_setup_by_slave()\n\nkernel BUG at net/core/skbuff.c:2306!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:pskb_expand_head+0xa08/0xfe0 net/core/skbuff.c:2306\nRSP: 0018:ffffc90004aff760 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: ffff88807e3c8780 RCX: ffffffff89593e0e\nRDX: ffff88807b7c4900 RSI: ffffffff89594747 RDI: ffff88807b7c4900\nRBP: 0000000000000820 R08: 0000000000000005 R09: 0000000000000000\nR10: 00000000961a63e0 R11: 0000000000000000 R12: ffff88807e3c8780\nR13: 00000000961a6560 R14: dffffc0000000000 R15: 00000000961a63e0\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fe1a0ed8df0 CR3: 000000002d816000 CR4: 00000000003526f0\nCall Trace:\n <TASK>\n ipgre_header+0xdd/0x540 net/ipv4/ip_gre.c:900\n dev_hard_header include/linux/netdevice.h:3439 [inline]\n packet_snd net/packet/af_packet.c:3028 [inline]\n packet_sendmsg+0x3ae5/0x53c0 net/packet/af_packet.c:3108\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg net/socket.c:742 [inline]\n ____sys_sendmsg+0xa54/0xc30 net/socket.c:2592\n ___sys_sendmsg+0x190/0x1e0 net/socket.c:2646\n __sys_sendmsg+0x170/0x220 net/socket.c:2678\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fe1a0e6c1a9\n\nWhen a non-Ethernet device (e.g. GRE tunnel) is enslaved to a bond,\nbond_setup_by_slave() directly copies the slave's header_ops to the\nbond device:\n\n    bond_dev->header_ops = slave_dev->header_ops;\n\nThis causes a type confusion when dev_hard_header() is later called\non the bond device. Functions like ipgre_header(), ip6gre_header(),all use\nnetdev_priv(dev) to access their device-specific private data. When\ncalled with the bond device, netdev_priv() returns the bond's private\ndata (struct bonding) instead of the expected type (e.g. struct\nip_tunnel), leading to garbage values being read and kernel crashes.\n\nFix this by introducing bond_header_ops with wrapper functions that\ndelegate to the active slave's header_ops using the slave's own\ndevice. This ensures netdev_priv() in the slave's header functions\nalways receives the correct device.\n\nThe fix is placed in the bonding driver rather than individual device\ndrivers, as the root cause is bond blindly inheriting header_ops from\nthe slave without considering that these callbacks expect a specific\nnetdev_priv() layout.\n\nThe type confusion can be observed by adding a printk in\nipgre_header() and running the following commands:\n\n    ip link add dummy0 type dummy\n    ip addr add 10.0.0.1/24 dev dummy0\n    ip link set dummy0 up\n    ip link add gre1 type gre local 10.0.0.1\n    ip link add bond1 type bond mode active-backup\n    ip link set gre1 master bond1\n    ip link set gre1 up\n    ip link set bond1 up\n    ip addr add fe80::1/64 dev bond1",
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