What’s Vulnerable › Vulnerabilities

CVE-2016-8666

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-10-16 · updated 2026-06-17
• Weakness: CWE-400

Description

The IP stack in the Linux kernel before 4.6 allows remote attackers to cause a denial of service (stack consumption and panic) or possibly have unspecified other impact by triggering use of the GRO path for packets with tunnel stacking, as demonstrated by interleaved IPv4 headers and GRE headers, a related issue to CVE-2016-7039.

Affected products

• Linux kernel: from 3.14 before 3.16.35; from 3.17 before 3.18.47; from 3.19 before 4.1.38; from 4.2 before 4.4.29; from 4.5 before 4.6 — fixed in 3.16.35, 3.18.47, 4.1.38, 4.4.29, 4.6

How to fix

Upgrade to a fixed version: Linux kernel 3.16.35, 3.18.47, 4.1.38, 4.4.29. Check the vendor advisory for mitigations.

References

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fac8e0f579695a3ecbc4d3cac369139d7f819971
• http://rhn.redhat.com/errata/RHSA-2016-2047.html
• http://rhn.redhat.com/errata/RHSA-2016-2107.html
• http://rhn.redhat.com/errata/RHSA-2016-2110.html
• http://rhn.redhat.com/errata/RHSA-2017-0004.html
• http://www.openwall.com/lists/oss-security/2016/10/13/11
• http://www.securityfocus.com/bid/93562
• https://access.redhat.com/errata/RHSA-2017:0372
• https://bto.bluecoat.com/security-advisory/sa134
• https://bugzilla.redhat.com/show_bug.cgi?id=1384991
• https://bugzilla.suse.com/show_bug.cgi?id=1001486
• https://github.com/torvalds/linux/commit/fac8e0f579695a3ecbc4d3cac369139d7f819971

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