--- title: "CVE-2018-14678\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-2018-14678?format=md keywords: index, follow --- # CVE-2018-14678 Publication date 28 July 2018 Last updated 4 July 2026 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **7.8 · High** [Score breakdown](https://ubuntu.com/security/CVE-2018-14678?format=md#impact-score) Toggle side navigation ## Description An issue was discovered in the Linux kernel through 4.17.11, as used in Xen through 4.11.x. The xen\_failsafe\_callback entry point in arch/x86/entry/entry\_64.S does not properly maintain RBX, which allows local users to cause a denial of service (uninitialized memory usage and system crash). Within Xen, 64-bit x86 PV Linux guest OS users can trigger a guest OS crash or possibly gain privileges. ### From the Ubuntu Security Team M. Vefa Bicakci and Andy Lutomirski discovered that the kernel did not properly set up all arguments to an error handler callback used when running as a paravirtualized guest. An unprivileged attacker in a paravirtualized guest VM could use this to cause a denial of service (guest VM crash). ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | linux | 19.04 disco | Not affected | | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-47.50 | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not affected | | linux-aws | 19.04 disco | Not affected | | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1035.37 | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not affected | | linux-aws-hwe | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 16.04 LTS xenial | Fixed 4.15.0-1035.37~16.04.1 | | 14.04 LTS trusty | Not in release | | linux-azure | 19.04 disco | Not affected | | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.18.0-1011.11~18.04.1 | | 16.04 LTS xenial | Fixed 4.15.0-1041.45 | | 14.04 LTS trusty | Fixed 4.15.0-1041.45~14.04.1 | | linux-azure-edge | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Fixed 4.18.0-1011.11~18.04.1 | | 16.04 LTS xenial | Fixed 4.15.0-1041.45 | | 14.04 LTS trusty | Not in release | | linux-euclid | 19.04 disco | Not in release | | 18.10 cosmic | 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-flo | 19.04 disco | Not in release | | 18.10 cosmic | 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-gcp | 19.04 disco | Not affected | | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1029.31 | | 16.04 LTS xenial | Fixed 4.15.0-1029.31~16.04.1 | | 14.04 LTS trusty | Not in release | | linux-gcp-edge | 19.04 disco | Not in release | | 18.10 cosmic | 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 | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not affected | | 16.04 LTS xenial | Ignored end of standard support | | 14.04 LTS trusty | Not in release | | linux-goldfish | 19.04 disco | Not in release | | 18.10 cosmic | 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-grouper | 19.04 disco | Not in release | | 18.10 cosmic | 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-hwe | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not affected | | 16.04 LTS xenial | Fixed 4.15.0-47.50~16.04.1 | | 14.04 LTS trusty | Not in release | | linux-hwe-edge | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not affected | | 16.04 LTS xenial | Fixed 4.15.0-47.50~16.04.1 | | 14.04 LTS trusty | Not in release | | linux-kvm | 19.04 disco | Not affected | | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1031.31 | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not in release | | linux-lts-trusty | 19.04 disco | Not in release | | 18.10 cosmic | 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-utopic | 19.04 disco | Not in release | | 18.10 cosmic | 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-vivid | 19.04 disco | Not in release | | 18.10 cosmic | 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-wily | 19.04 disco | Not in release | | 18.10 cosmic | 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 | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not affected | | linux-maguro | 19.04 disco | Not in release | | 18.10 cosmic | 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-mako | 19.04 disco | Not in release | | 18.10 cosmic | 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-manta | 19.04 disco | Not in release | | 18.10 cosmic | 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 | 19.04 disco | Not affected | | 18.10 cosmic | Fixed 4.15.0-1035.40 | | 18.04 LTS bionic | Fixed 4.15.0-1035.40 | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not in release | | linux-oracle | 19.04 disco | Not affected | | 18.10 cosmic | Fixed 4.15.0-1010.12 | | 18.04 LTS bionic | Fixed 4.15.0-1010.12 | | 16.04 LTS xenial | Fixed 4.15.0-1010.12~16.04.1 | | 14.04 LTS trusty | Not in release | | linux-raspi2 | 19.04 disco | Not affected | | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1033.35 | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not in release | | linux-snapdragon | 19.04 disco | Not affected | | 18.10 cosmic | 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) * [Patch details](https://ubuntu.com/security/CVE-2018-14678?format=md#patch-details) ### Patch details For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) | Package | Patch details | | --- | --- | | linux | * Introduced by [3ac6d8c](https://git.kernel.org/linus/3ac6d8c787b835b997eb23e43e09aa0895ef7d58), fixed by [b3681dd](https://git.kernel.org/linus/b3681dd548d06deb2e1573890829dff4b15abf46) | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 7.8 · High * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Local | | Attack complexity | Low | | Privileges required | Low | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | High | | Integrity impact | High | | Availability impact | High | * Scores | Parameter | Value | | --- | --- | | Base score | 7.8 · High | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14678) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-14678) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-14678) * [Debian](https://security-tracker.debian.org/tracker/CVE-2018-14678) ### Related Ubuntu Security Notices (USN) + [USN-3931-1](https://usn.ubuntu.com/USN-3931-1) + Linux kernel vulnerabilities + 2 April 2019 + [USN-3931-2](https://usn.ubuntu.com/USN-3931-2) + Linux kernel (HWE) vulnerabilities + 2 April 2019 ### Other references * * *