CVE-2017-18509
Description
An issue was discovered in net/ipv6/ip6mr.c in the Linux kernel before 4.11. By setting a specific socket option, an attacker can control a pointer in kernel land and cause an inet_csk_listen_stop general protection fault, or potentially execute arbitrary code under certain circumstances. The issue can be triggered as root (e.g., inside a default LXC container or with the CAP_NET_ADMIN capability) or after namespace unsharing. This occurs because sk_type and protocol are not checked in the appropriate part of the ip6_mroute_* functions. NOTE: this affects Linux distributions that use 4.9.x longterm kernels before 4.9.187.
How to fix
- linux linux_kernel3.16.72, 4.4.187, 4.9.187, 4.11 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 3.16.72, 3.17 ≤ v < 4.4.187, 4.5 ≤ v < 4.9.187, 4.10 ≤ v < 4.11 | 3.16.72, 4.4.187, 4.9.187, 4.11 |
| canonical ubuntu_linux | 16.04 | — |
| debian debian_linux | 8.0, 9.0, 10.0 | — |
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