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CVE-2016-8666

23
FAUCET Score

CVE-2016-8666 is a denial-of-service vulnerability affecting the Linux kernel before version 4.6, specifically within its IP stack. Remote attackers can trigger stack consumption and system panic by sending specially crafted packets with interleaved IPv4 and GRE headers, exploiting the Generic Receive Offload (GRO) path. This vulnerability carries a high CVSS score of 7.5, indicating a severe impact on availability with low attack complexity and no user interaction required. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.14, < 3.16.35CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 3.17, < 3.18.47CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 3.19, < 4.1.38CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 4.2, < 4.4.29CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 4.5, < 4.6CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.70%
Probability of exploitation in next 30 days
EPSS Percentile
90.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0470 is in the 84th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-rt-0:3.10.0-327.36.3.rt56.238.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-0:3.10.0-327.36.2.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-aarch64-0:4.5.0-15.2.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.1 Extended Update SupportFixed in: kernel-0:3.10.0-229.46.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: kernel-rt-1:3.10.0-327.rt56.198.el6rt
View patch

Vendor Advisories (1)

redhatCVE-2016-8666Important

kernel: Remotely triggerable recursion in GRE code leading to kernel crash

Oct 13, 2016

References

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