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 [ … ]
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws-5.4 | < any | UNKNOWN |
ubuntu | 16.04 | noarch | linux-aws-hwe | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 14.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 16.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-azure-4.15 | < any | UNKNOWN |
git.kernel.org/linus/67a9c94317402b826fc3db32afc8f39336803d97 (5.14-rc2)
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
launchpad.net/bugs/cve/CVE-2021-47309
nvd.nist.gov/vuln/detail/CVE-2021-47309
security-tracker.debian.org/tracker/CVE-2021-47309
www.cve.org/CVERecord?id=CVE-2021-47309