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": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"include/net/dst_metadata.h"
],
"versions": [
{
"version": "61adedf3e3f1",
"lessThan": "e7f3c9df4051",
"status": "affected",
"versionType": "git"
},
{
"version": "61adedf3e3f1",
"lessThan": "b61d327cd3cc",
"status": "affected",
"versionType": "git"
},
{
"version": "61adedf3e3f1",
"lessThan": "83bdcfbd968b",
"status": "affected",
"versionType": "git"
},
{
"version": "61adedf3e3f1",
"lessThan": "8bb1589c89e6",
"status": "affected",
"versionType": "git"
},
{
"version": "61adedf3e3f1",
"lessThan": "8aa13a86964c",
"status": "affected",
"versionType": "git"
},
{
"version": "61adedf3e3f1",
"lessThan": "2179d96ec702",
"status": "affected",
"versionType": "git"
},
{
"version": "61adedf3e3f1",
"lessThan": "a915379594f1",
"status": "affected",
"versionType": "git"
},
{
"version": "61adedf3e3f1",
"lessThan": "67a9c9431740",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"include/net/dst_metadata.h"
],
"versions": [
{
"version": "4.3",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.3",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.4.277",
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.9.277",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.14.241",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.199",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.135",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.53",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.13.5",
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.14",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5
git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97
git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d
git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a
git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6
git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58
git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5
git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887