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UBUNTU-CVE-2018-3639
Vulnerability in intel-microcode (UBUNTU-CVE-2018-3639)
Summary
vulnerability in intel-microcode (UBUNTU-CVE-2018-3639). Confidential information can be exposed externally. Mitigation: upgrade to `3.20180807a.0ubuntu0.14.04.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **UBUNTU-CVE-2018-3639** has been found in intel-microcode.
Confidential information can be exposed externally. CVSS score: ?/10.
What to do: upgrade intel-microcode to **3.20180807a.0ubuntu0.14.04.1** or later.
If unsure, ask your IT team or search "intel-microcode UBUNTU-CVE-2018-3639" on the vendor's site.
UBUNTU-CVE-2018-3639 (intel-microcode) —
Attack vector: local / no user interaction
Patched: `3.20180807a.0ubuntu0.14.04.1` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (unclassified) exists in intel-microcode.
📍 Affected scope
intel-microcode — .
🔥 Severity
Severity: ?. Confidential information can be exposed externally
🔧 How to fix
Update to **3.20180807a.0ubuntu0.14.04.1**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'intel-microcode' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'intel-microcode' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `intel-microcode` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade intel-microcode to 3.20180807a.0ubuntu0.14.04.1ステージング環境で 3.20180807a.0ubuntu0.14.04.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
-
7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
Ubuntu:14.04:LTS
intel-microcode
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.20180807a.0ubuntu0.14.04.1"}]}]
Ubuntu:14.04:LTS
libvirt
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.2-0ubuntu13.1.27"}]}]
Ubuntu:14.04:LTS
linux
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.13.0-149.199"}]}]
Ubuntu:14.04:LTS
linux-aws
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-1022.22"}]}]
Ubuntu:14.04:LTS
linux-lts-xenial
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-127.153~14.04.1"}]}]
Ubuntu:14.04:LTS
qemu
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0+dfsg-2ubuntu1.42"}]}]
Ubuntu:16.04:LTS
intel-microcode
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.20180807a.0ubuntu0.16.04.1"}]}]
Ubuntu:16.04:LTS
libvirt
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.1-1ubuntu10.24"}]}]
Ubuntu:16.04:LTS
linux
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-127.153"}]}]
Ubuntu:16.04:LTS
linux-aws
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-1060.69"}]}]
Ubuntu:16.04:LTS
linux-azure
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.13.0-1018.21"}]}]
Ubuntu:16.04:LTS
linux-gcp
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.13.0-1017.21"}]}]
Ubuntu:16.04:LTS
linux-hwe
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.13.0-43.48~16.04.1"}]}]
Ubuntu:16.04:LTS
linux-kvm
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-1026.31"}]}]
Ubuntu:16.04:LTS
linux-oem
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.13.0-1028.31"}]}]
Ubuntu:16.04:LTS
linux-raspi2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-1091.99"}]}]
Ubuntu:16.04:LTS
linux-snapdragon
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-1094.99"}]}]
Ubuntu:16.04:LTS
qemu
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.5+dfsg-5ubuntu10.29"}]}]
Ubuntu:16.04:LTS
xen
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS:16.04:LTS
linux-fips
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-1008.10"}]}]
Ubuntu:18.04:LTS
intel-microcode
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.20180807a.0ubuntu0.18.04.1"}]}]
Ubuntu:18.04:LTS
libvirt
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.0-1ubuntu8.2"}]}]
Ubuntu:18.04:LTS
linux
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-22.24"}]}]
Ubuntu:18.04:LTS
linux-aws
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1009.9"}]}]
Ubuntu:18.04:LTS
linux-azure
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1012.12"}]}]
Ubuntu:18.04:LTS
linux-gcp
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1008.8"}]}]
Ubuntu:18.04:LTS
linux-kvm
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1010.10"}]}]
Ubuntu:18.04:LTS
linux-oem
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1006.9"}]}]
Ubuntu:18.04:LTS
linux-raspi2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1012.13"}]}]
Ubuntu:18.04:LTS
linux-snapdragon
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1053.57"}]}]
Ubuntu:18.04:LTS
qemu
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.11+dfsg-1ubuntu7.2"}]}]
Ubuntu:Pro:20.04:LTS
linux-azure-fde-5.15
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
linux-intel-iot-realtime
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
linux-realtime
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
linux-raspi-realtime
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04
linux-nvidia
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- advisory https://ubuntu.com/security/notices/USN-3652-1
- advisory https://ubuntu.com/security/notices/USN-3653-1
- advisory https://ubuntu.com/security/notices/USN-3653-2
- advisory https://ubuntu.com/security/notices/USN-3654-1
- advisory https://ubuntu.com/security/notices/USN-3654-2
- advisory https://ubuntu.com/security/notices/USN-3655-1
- advisory https://ubuntu.com/security/notices/USN-3655-2
- advisory https://ubuntu.com/security/notices/USN-3651-1
- advisory https://ubuntu.com/security/notices/USN-3680-1
- advisory https://ubuntu.com/security/notices/USN-3679-1
- advisory https://ubuntu.com/security/notices/USN-3756-1
- advisory https://ubuntu.com/security/notices/USN-3777-3
- report https://ubuntu.com/security/CVE-2018-3639
- report https://bugs.chromium.org/p/project-zero/issues/detail?id=1528
- report https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html
- report http://xenbits.xen.org/xsa/advisory-263.html
- report https://www.cve.org/CVERecord?id=CVE-2018-3639