--- title: "CVE-2018-1108\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-2018-1108?format=md keywords: index, follow --- # CVE-2018-1108 Publication date 21 May 2018 Last updated 4 July 2026 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **5.9 · Medium** [Score breakdown](https://ubuntu.com/security/CVE-2018-1108?format=md#impact-score) Toggle side navigation ## Description kernel drivers before version 4.17-rc1 are vulnerable to a weakness in the Linux kernel's implementation of random seed data. Programs, early in the boot sequence, could use the data allocated for the seed before it was sufficiently generated. ### From the Ubuntu Security Team Jann Horn discovered that the Linux kernel's implementation of random seed data reported that it was in a ready state before it had gathered sufficient entropy. An attacker could use this to expose sensitive information. [Read the notes from the security team](https://ubuntu.com/security/CVE-2018-1108?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | linux | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-33.36 | | 17.10 artful | Ignored end of life | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not affected | | linux-aws | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1020.20 | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not affected | | linux-azure | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1022.23 | | 17.10 artful | Not in release | | 16.04 LTS xenial | Fixed 4.15.0-1022.22~16.04.1 | | 14.04 LTS trusty | Not affected | | linux-azure-edge | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not affected | | 16.04 LTS xenial | Fixed 4.15.0-1022.23 | | 14.04 LTS trusty | Not in release | | linux-euclid | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-flo | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-gcp | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1018.19 | | 17.10 artful | Not in release | | 16.04 LTS xenial | Fixed 4.15.0-1018.19~16.04.2 | | 14.04 LTS trusty | Not in release | | linux-gke | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Ignored end of standard support, was needs-triage | | 14.04 LTS trusty | Not in release | | linux-goldfish | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-grouper | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-hwe | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not affected | | 17.10 artful | Not in release | | 16.04 LTS xenial | Fixed 4.15.0-33.36~16.04.1 | | 14.04 LTS trusty | Not in release | | linux-hwe-edge | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not affected | | 17.10 artful | Not in release | | 16.04 LTS xenial | Fixed 4.15.0-33.36~16.04.1 | | 14.04 LTS trusty | Not in release | | linux-kvm | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1020.20 | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not in release | | linux-lts-trusty | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-lts-utopic | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-lts-vivid | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-lts-wily | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-lts-xenial | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not affected | | linux-maguro | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-mako | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-manta | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | linux-oem | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1017.20 | | 17.10 artful | Not in release | | 16.04 LTS xenial | Ignored end of standard support, was needed | | 14.04 LTS trusty | Not in release | | linux-raspi2 | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Fixed 4.15.0-1021.23 | | 17.10 artful | Ignored end of life | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not in release | | linux-snapdragon | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not affected | | 17.10 artful | 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-2018-1108?format=md#patch-details) ## Notes --- ### [sbeattie](https://launchpad.net/~sbeattie) not clear if RNDRESEEDCRNG ioctl should be backported, too; it's unlikely user space will receive backports to support it. fix introduced regression bug LP: #1779827 ### 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 [e192be9](https://git.kernel.org/linus/e192be9d9a30555aae2ca1dc3aad37cba484cd4a), fixed by [43838a2](https://git.kernel.org/linus/43838a23a05fbd13e47d750d3dfd77001536dd33) * Introduced by [ee7998c](https://git.kernel.org/linus/ee7998c50c2697737c6530431709f77c852bf0d6), fixed by [dc12baa](https://git.kernel.org/linus/dc12baacb95f205948f64dc936a47d89ee110117) * Introduced by [1e7f583](https://git.kernel.org/linus/1e7f583af67be4ff091d0aeb863c649efd7a9112), fixed by [8ef35c8](https://git.kernel.org/linus/8ef35c866f8862df074a49a93b0309725812dea8) | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 5.9 · Medium * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | High | | Privileges required | None | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | High | | Availability impact | None | * Scores | Parameter | Value | | --- | --- | | Base score | 5.9 · Medium | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1108) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-1108) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-1108) * [Debian](https://security-tracker.debian.org/tracker/CVE-2018-1108) ### Related Ubuntu Security Notices (USN) + [USN-3752-2](https://usn.ubuntu.com/USN-3752-2) + Linux kernel (HWE) vulnerabilities + 24 August 2018 + [USN-3752-1](https://usn.ubuntu.com/USN-3752-1) + Linux kernel vulnerabilities + 24 August 2018 + [USN-3752-3](https://usn.ubuntu.com/USN-3752-3) + Linux kernel (Azure, GCP, OEM) vulnerabilities + 28 August 2018 ### Other references * * * * *