# CVE-2018-3646: Information disclosure in Multiple > Local attackers with guest OS privileges can read sensitive L1 cache data via speculative execution side-channels, requiring microcode or OS patches. - **Severity:** Medium 5.6 (`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 14 Aug 2018 - **Updated:** 29 May 2026 - **Also known as:** ALPINE-CVE-2018-3646, DEBIAN-CVE-2018-3646, GHSA-qj7r-58vw-6www, SUSE-SU-2018:2394-1, SUSE-SU-2018:2401-1, SUSE-SU-2018:2409-1, SUSE-SU-2018:2410-1, SUSE-SU-2018:2410-2, SUSE-SU-2018:2426-1, SUSE-SU-2018:2473-1, SUSE-SU-2018:2480-1, SUSE-SU-2018:2482-1, SUSE-SU-2018:2483-1, UBUNTU-CVE-2018-3646 ## What is CVE-2018-3646? CVE-2018-3646 is a medium-severity vulnerability in Intel Corporation Multiple, published on 14 Aug 2018. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description Systems with microprocessors utilizing speculative execution and address translations may allow unauthorized disclosure of information residing in the L1 data cache to an attacker with local user access with guest OS privilege via a terminal page fault and a side-channel analysis. Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) ## Which versions are affected by CVE-2018-3646? It affects 8 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `xen` | SUSE:Enterprise Storage 4 | All versions | 4.7.6_04-43.39.1 | | `xen` | SUSE:Linux Enterprise Desktop 12 SP3 | All versions | 4.9.2_10-3.41.1 | | `kgraft` | SUSE:Linux Enterprise Live Patching 12 | All versions | 1.0-23.9.1 | | `kgraft` | SUSE:Linux Enterprise Live Patching 12 SP3 | All versions | 1.0-23.9.1 | | `kgraft-patch-SLE12-SP3_Update_14` | SUSE:Linux Enterprise Live Patching 12 SP3 | All versions | 2-2.1 | | `kgraft-patch-SLE12-SP3_Update_15` | SUSE:Linux Enterprise Live Patching 12 SP3 | All versions | 2-2.1 | | `kernel-livepatch-SLE15_Update_2` | SUSE:Linux Enterprise Live Patching 15 | All versions | 2-2.1 | | `kernel-livepatch-tools` | SUSE:Linux Enterprise Live Patching 15 | All versions | 1.1-5.3.1 | | `xen` | SUSE:Linux Enterprise Module for Basesystem 15 | All versions | 4.10.1_08-3.6.1 | | `xen` | SUSE:Linux Enterprise Module for Server Applications 15 | All versions | 4.10.1_08-3.6.1 | | `xen` | SUSE:Linux Enterprise Server 11 SP4 | All versions | 4.4.4_36-61.37.2 | | `xen` | SUSE:Linux Enterprise Server 12 SP1-LTSS | All versions | 4.5.5_26-22.55.2 | | `xen` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 4.7.6_04-43.39.1 | | `xen` | SUSE:Linux Enterprise Server 12 SP2-LTSS | All versions | 4.7.6_04-43.39.1 | | `xen` | SUSE:Linux Enterprise Server 12 SP3 | All versions | 4.9.2_10-3.41.1 | | `xen` | SUSE:Linux Enterprise Server 12-LTSS | All versions | 4.4.4_36-22.74.1 | | `xen` | SUSE:Linux Enterprise Server for SAP Applications 11 SP4 | All versions | 4.4.4_36-61.37.2 | | `xen` | SUSE:Linux Enterprise Server for SAP Applications 12 SP1 | All versions | 4.5.5_26-22.55.2 | | `xen` | SUSE:Linux Enterprise Server for SAP Applications 12 SP2 | All versions | 4.7.6_04-43.39.1 | | `xen` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 4.9.2_10-3.41.1 | | `xen` | SUSE:Linux Enterprise Software Development Kit 11 SP4 | All versions | 4.4.4_36-61.37.2 | | `xen` | SUSE:Linux Enterprise Software Development Kit 12 SP3 | All versions | 4.9.2_10-3.41.1 | | `xen` | SUSE:OpenStack Cloud 7 | All versions | 4.7.6_04-43.39.1 | Products: Intel Core I3, Intel Core I5, Intel Core I7, Intel Core M, Intel Core M3, Intel Core M5, Intel Core M7, Intel Xeon. ## How do I fix CVE-2018-3646? Apply the vendor's patch. ## Is CVE-2018-3646 being exploited? There is no known exploitation of CVE-2018-3646 in the wild and no public exploit code. ## Other vulnerabilities in Intel Corporation Multiple - [CVE-2018-12169](https://insights.sbomify.com/CVE-2018-12169/): Auth bypass in n/a (high 7.6) - [CVE-2018-3615](https://insights.sbomify.com/CVE-2018-3615/): Information disclosure in Multiple (high 7.3) - [CVE-2017-5704](https://insights.sbomify.com/CVE-2017-5704/): Information disclosure in Intel Core Processor (medium 6.7) - [CVE-2018-3620](https://insights.sbomify.com/CVE-2018-3620/): Information disclosure in Multiple (medium 5.6) - [CVE-2018-3619](https://insights.sbomify.com/CVE-2018-3619/): Information disclosure in Intel Optane memory (medium 4.6) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2018-3646 and fix it if it is affected. What it is: CVE-2018-3646 is a medium-severity vulnerability in Intel Corporation Multiple, published on 14 Aug 2018. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2018-3646 in the wild and no public exploit code. Affected product: Intel Corporation Multiple. 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-2018-3646/ (Markdown: https://insights.sbomify.com/CVE-2018-3646/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2018-3646 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-3646 - OSV: https://osv.dev/vulnerability/CVE-2018-3646 --- From sbomify Insights: https://insights.sbomify.com/CVE-2018-3646/ Summaries are generated and may contain mistakes; the official description above is the record.