High · published May 21, 2024
In the Linux kernel, the following vulnerability has been resolved:
net: validate lwtstate->data before returning from skb_tunnel_info()
skb_tunnel_info() returns pointer of lwtstate->data as ip_tunnel_info
type without validation. lwtstate->data can have various types such as
mpls_iptunnel_encap, etc and these are not compatible.
So skb_tunnel_info() should validate before returning that pointer.
Splat looks like:
BUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan]
Read of size 2 at addr ffff888106ec2698 by task ping/811
CPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195
Call Trace:
dump_stack_lvl+0x56/0x7b
print_address_description.constprop.8.cold.13+0x13/0x2ee
? vxlan_get_route+0x418/0x4b0 [vxlan]
? vxlan_get_route+0x418/0x4b0 [vxlan]
kasan_report.cold.14+0x83/0xdf
? vxlan_get_route+0x418/0x4b0 [vxlan]
vxlan_get_route+0x418/0x4b0 [vxlan]
[ ... ]
vxlan_xmit_one+0x148b/0x32b0 [vxlan]
[ ... ]
vxlan_xmit+0x25c5/0x4780 [vxlan]
[ ... ]
dev_hard_start_xmit+0x1ae/0x6e0
__dev_queue_xmit+0x1f39/0x31a0
[ ... ]
neigh_xmit+0x2f9/0x940
mpls_xmit+0x911/0x1600 [mpls_iptunnel]
lwtunnel_xmit+0x18f/0x450
ip_finish_output2+0x867/0x2040
[ ... ]
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 4.3, < 4.4.277 | 4.4.277 |
| linux/linux_kernel | ≥ 4.5, < 4.9.277 | 4.9.277 |
| linux/linux_kernel | ≥ 4.10, < 4.14.241 | 4.14.241 |
| linux/linux_kernel | ≥ 4.15, < 4.19.199 | 4.19.199 |
| linux/linux_kernel | ≥ 4.20, < 5.4.135 | 5.4.135 |
| linux/linux_kernel | ≥ 5.5, < 5.10.53 | 5.10.53 |
| linux/linux_kernel | ≥ 5.11, < 5.13.5 | 5.13.5 |
| linux/linux_kernel | all versions | — |