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.

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

References

• https://www.suse.com/security/cve/CVE-2017-18509.html
• https://security-tracker.debian.org/tracker/CVE-2017-18509