CVE-2016-9919

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-12-08 · updated 2026-06-17
Weakness: CWE-20

Description

The icmp6_send function in net/ipv6/icmp.c in the Linux kernel through 4.8.12 omits a certain check of the dst data structure, which allows remote attackers to cause a denial of service (panic) via a fragmented IPv6 packet.

Affected products

Linux kernel: from 4.8.10 before 4.9; 4.4.223, 4.9-rc6, 4.9-rc7 — fixed in 4.9

How to fix

Upgrade to a fixed version: Linux kernel 4.9. Check the vendor advisory for mitigations.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=79dc7e3f1cd323be4c81aa1a94faa1b3ed987fb2
http://www.openwall.com/lists/oss-security/2016/12/08/15
http://www.securityfocus.com/bid/94824
https://github.com/torvalds/linux/commit/79dc7e3f1cd323be4c81aa1a94faa1b3ed987fb2
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=79dc7e3f1cd323be4c81aa1a94faa1b3ed987fb2
http://www.openwall.com/lists/oss-security/2016/12/08/15
http://www.securityfocus.com/bid/94824
https://github.com/torvalds/linux/commit/79dc7e3f1cd323be4c81aa1a94faa1b3ed987fb2

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