---
title: "CVE-2016-3707\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2016-3707?format=md
keywords: index, follow
---

# CVE-2016-3707

Publication date 27 June 2016

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**8.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2016-3707?format=md#impact-score)

Toggle side navigation

## Description

The icmp\_check\_sysrq function in net/ipv4/icmp.c in the kernel.org
projects/rt patches for the Linux kernel, as used in the kernel-rt package
before 3.10.0-327.22.1 in Red Hat Enterprise Linux for Real Time 7 and
other products, allows remote attackers to execute SysRq commands via
crafted ICMP Echo Request packets, as demonstrated by a brute-force attack
to discover a cookie, or an attack that occurs after reading the local
icmp\_echo\_sysrq file.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2016-3707?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| linux | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |
| linux-aws | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |
| linux-aws-5.0 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-aws-5.3 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-aws-hwe | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| linux-azure | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |
| linux-azure-4.15 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-azure-5.3 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-azure-edge | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-gcp | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| linux-gcp-5.3 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-gcp-edge | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-gke-4.15 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-gke-5.0 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-gke-5.3 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-hwe | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| linux-hwe-edge | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| linux-kvm | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| linux-lts-trusty | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-lts-xenial | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not affected |
| linux-oem | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| linux-oem-5.6 | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-oem-osp1 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-oracle | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| linux-oracle-5.0 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-oracle-5.3 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-raspi | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-raspi2 | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| linux-raspi2-5.3 | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-riscv | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| linux-snapdragon | 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [sbeattie](https://launchpad.net/~sbeattie)

only affects kernels with PREEMPT\_RT applied and enabled,
which is not the case in Ubuntu kernels.

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.1 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.1 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-3707)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-3707)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-3707)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-3707)

### Other references

* <https://lwn.net/Articles/448790/>
* <https://bugzilla.redhat.com/show_bug.cgi?id=1327484>
* <http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00005.html>
* <http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html>
* <http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00007.html>
* <http://www.openwall.com/lists/oss-security/2016/05/17/1>
* <https://access.redhat.com/errata/RHSA-2016:1301>
* <https://access.redhat.com/errata/RHSA-2016:1341>
* <https://www.cve.org/CVERecord?id=CVE-2016-3707>