# CVE-2020-16166: Information disclosure in n/a > Remote attackers can observe network RNG state to obtain sensitive internal information, affecting Linux kernel users. - **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 30 Jul 2020 - **Updated:** 4 Aug 2024 - **Also known as:** DEBIAN-CVE-2020-16166, GHSA-6c68-84gq-j9gr, RHSA-2020:5418, RHSA-2020:5428, RHSA-2020:5473, RHSA-2020:5506, UBUNTU-CVE-2020-16166 ## What is CVE-2020-16166? CVE-2020-16166 is a low-severity vulnerability in Canonical Ubuntu Linux, published on 30 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG, aka CID-f227e3ec3b5c. This is related to drivers/char/random.c and kernel/time/timer.c. Weakness: CWE-330 (Use of Insufficiently Random Values) ## Which versions are affected by CVE-2020-16166? It affects 15 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `bpftool` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `bpftool-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-abi-whitelists` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-core` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debug` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debug-core` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debug-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debug-devel` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debug-modules` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debug-modules-extra` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debuginfo-common-aarch64` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debuginfo-common-ppc64le` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debuginfo-common-s390x` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debuginfo-common-x86_64` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-devel` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-doc` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-modules` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-modules-extra` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-tools` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-tools-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-tools-libs` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-zfcpdump` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-zfcpdump-core` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-zfcpdump-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-zfcpdump-devel` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-zfcpdump-modules` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-zfcpdump-modules-extra` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `perf` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `perf-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `python3-perf` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `python3-perf-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-240.8.1.el8_3 | | `bpftool-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debug-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debuginfo-common-aarch64` | Red Hat:enterprise_linux:8::crb | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debuginfo-common-ppc64le` | Red Hat:enterprise_linux:8::crb | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-debuginfo-common-x86_64` | Red Hat:enterprise_linux:8::crb | All versions | 0:4.18.0-240.8.1.el8_3 | | `kernel-tools-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:4.18.0-240.8.1.el8_3 | Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Linux kernel, Netapp Active Iq Unified Manager, Netapp Cloud Volumes Ontap Mediator, Netapp E-Series Santricity Os Controller, Netapp H410c Firmware, Netapp Hci Bootstrap Os, Netapp Hci Management Node, Netapp Solidfire, Netapp Steelstore Cloud Integrated Storage, Netapp Storagegrid, Opensuse Leap, Oracle Sd-Wan Edge. ## How do I fix CVE-2020-16166? Apply the vendor's patch. ## Is CVE-2020-16166 being exploited? There is no known exploitation of CVE-2020-16166 in the wild and no public exploit code. ## Other vulnerabilities in Canonical Ubuntu Linux - [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild) - [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild) - [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2020-16166 and fix it if it is affected. What it is: CVE-2020-16166 is a low-severity vulnerability in Canonical Ubuntu Linux, published on 30 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2020-16166 in the wild and no public exploit code. Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2020-16166/ (Markdown: https://insights.sbomify.com/CVE-2020-16166/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-16166 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-16166 - OSV: https://osv.dev/vulnerability/CVE-2020-16166 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-16166/ Summaries are generated and may contain mistakes; the official description above is the record.