CVE-2026-23046 virtio_net: fix device mismatch in devm_kzalloc/devm_kfree
In the Linux kernel, the following vulnerability has been resolved:

virtio_net: fix device mismatch in devm_kzalloc/devm_kfree

Initial rss_hdr allocation uses virtio_device->device,
but virtnet_set_queues() frees using net_device->device.
This device mismatch causing below devres warning

[ 3788.514041] ------------[ cut here ]------------
[ 3788.514044] WARNING: drivers/base/devres.c:1095 at devm_kfree+0x84/0x98, CPU#16: vdpa/1463
[ 3788.514054] Modules linked in: octep_vdpa virtio_net virtio_vdpa [last unloaded: virtio_vdpa]
[ 3788.514064] CPU: 16 UID: 0 PID: 1463 Comm: vdpa Tainted: G        W           6.18.0 #10 PREEMPT
[ 3788.514067] Tainted: [W]=WARN
[ 3788.514069] Hardware name: Marvell CN106XX board (DT)
[ 3788.514071] pstate: 63400009 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
[ 3788.514074] pc : devm_kfree+0x84/0x98
[ 3788.514076] lr : devm_kfree+0x54/0x98
[ 3788.514079] sp : ffff800084e2f220
[ 3788.514080] x29: ffff800084e2f220 x28: ffff0003b2366000 x27: 000000000000003f
[ 3788.514085] x26: 000000000000003f x25: ffff000106f17c10 x24: 0000000000000080
[ 3788.514089] x23: ffff00045bb8ab08 x22: ffff00045bb8a000 x21: 0000000000000018
[ 3788.514093] x20: ffff0004355c3080 x19: ffff00045bb8aa00 x18: 0000000000080000
[ 3788.514098] x17: 0000000000000040 x16: 000000000000001f x15: 000000000007ffff
[ 3788.514102] x14: 0000000000000488 x13: 0000000000000005 x12: 00000000000fffff
[ 3788.514106] x11: ffffffffffffffff x10: 0000000000000005 x9 : ffff800080c8c05c
[ 3788.514110] x8 : ffff800084e2eeb8 x7 : 0000000000000000 x6 : 000000000000003f
[ 3788.514115] x5 : ffff8000831bafe0 x4 : ffff800080c8b010 x3 : ffff0004355c3080
[ 3788.514119] x2 : ffff0004355c3080 x1 : 0000000000000000 x0 : 0000000000000000
[ 3788.514123] Call trace:
[ 3788.514125]  devm_kfree+0x84/0x98 (P)
[ 3788.514129]  virtnet_set_queues+0x134/0x2e8 [virtio_net]
[ 3788.514135]  virtnet_probe+0x9c0/0xe00 [virtio_net]
[ 3788.514139]  virtio_dev_probe+0x1e0/0x338
[ 3788.514144]  really_probe+0xc8/0x3a0
[ 3788.514149]  __driver_probe_device+0x84/0x170
[ 3788.514152]  driver_probe_device+0x44/0x120
[ 3788.514155]  __device_attach_driver+0xc4/0x168
[ 3788.514158]  bus_for_each_drv+0x8c/0xf0
[ 3788.514161]  __device_attach+0xa4/0x1c0
[ 3788.514164]  device_initial_probe+0x1c/0x30
[ 3788.514168]  bus_probe_device+0xb4/0xc0
[ 3788.514170]  device_add+0x614/0x828
[ 3788.514173]  register_virtio_device+0x214/0x258
[ 3788.514175]  virtio_vdpa_probe+0xa0/0x110 [virtio_vdpa]
[ 3788.514179]  vdpa_dev_probe+0xa8/0xd8
[ 3788.514183]  really_probe+0xc8/0x3a0
[ 3788.514186]  __driver_probe_device+0x84/0x170
[ 3788.514189]  driver_probe_device+0x44/0x120
[ 3788.514192]  __device_attach_driver+0xc4/0x168
[ 3788.514195]  bus_for_each_drv+0x8c/0xf0
[ 3788.514197]  __device_attach+0xa4/0x1c0
[ 3788.514200]  device_initial_probe+0x1c/0x30
[ 3788.514203]  bus_probe_device+0xb4/0xc0
[ 3788.514206]  device_add+0x614/0x828
[ 3788.514209]  _vdpa_register_device+0x58/0x88
[ 3788.514211]  octep_vdpa_dev_add+0x104/0x228 [octep_vdpa]
[ 3788.514215]  vdpa_nl_cmd_dev_add_set_doit+0x2d0/0x3c0
[ 3788.514218]  genl_family_rcv_msg_doit+0xe4/0x158
[ 3788.514222]  genl_rcv_msg+0x218/0x298
[ 3788.514225]  netlink_rcv_skb+0x64/0x138
[ 3788.514229]  genl_rcv+0x40/0x60
[ 3788.514233]  netlink_unicast+0x32c/0x3b0
[ 3788.514237]  netlink_sendmsg+0x170/0x3b8
[ 3788.514241]  __sys_sendto+0x12c/0x1c0
[ 3788.514246]  __arm64_sys_sendto+0x30/0x48
[ 3788.514249]  invoke_syscall.constprop.0+0x58/0xf8
[ 3788.514255]  do_el0_svc+0x48/0xd0
[ 3788.514259]  el0_svc+0x48/0x210
[ 3788.514264]  el0t_64_sync_handler+0xa0/0xe8
[ 3788.514268]  el0t_64_sync+0x198/0x1a0
[ 3788.514271] ---[ end trace 0000000000000000 ]---

Fix by using virtio_device->device consistently for
allocation and deallocation
Affected products: vendor: Linux
product: Linux
default_status: unaffected
vendor: Linux
product: Linux
default_status: affected
Published: 2026-02-04T16:00:28.772Z