CVE-2017-18509 — An issue was discovered in net/ipv6/ip6mr

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 circu

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-08-13T13:17:36.000Z
• Last modified: 2024-08-05T21:28:54.826Z

09References

• pulsesecurity.co.nz — https://pulsesecurity.co.nz/advisories/linux-kernel-4.9-inetcsklistenstop-gpf
• salsa.debian.org — https://salsa.debian.org/kernel-team/linux/commit/baefcdc2f29923e7325ce4e1a72c3f…
• lists.openwall.net — https://lists.openwall.net/netdev/2017/12/04/40
• github.com — https://github.com/torvalds/linux/commit/99253eb750fda6a644d5188fb26c43bad8d5a74…
• git.kernel.org — https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=99253…
• www.debian.org — https://www.debian.org/security/2019/dsa-4497
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html
• seclists.org — https://seclists.org/bugtraq/2019/Aug/26
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html
• packetstormsecurity.com — http://packetstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackwar…
• support.f5.com — https://support.f5.com/csp/article/K41582535
• usn.ubuntu.com — https://usn.ubuntu.com/4145-1/
• support.f5.com — https://support.f5.com/csp/article/K41582535?utm_source=f5support&amp%3Butm_medi…