FedoraOperating system · Fedoraproject
CVE-2021-0086
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedObservable response discrepancy in floating-point operations for some Intel(R) Processors may allow an authorized user to potentially enable information disclosure via local access.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis vulnerability involves an observable response discrepancy in floating-point operations for certain Intel processors. A local, authorized user could potentially observe subtle differences in how the processor handles floating-point operations, enabling information disclosure through what appears to be a timing or side-channel analysis technique.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
FedoraOperating system
= 33= 34< 11.0.0.1225all versionsall versionsall versionsall versionsall versionsCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Fedora versionRun 'cat /etc/fedora-release' or 'hostnamectl' to identify the installed Fedora versionAffected if Running Fedora 33 or 34 indicates potential exposure to this vulnerability
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Check Intel Brand Verification Tool versionRun 'intel-brand-verification-tool --version' or check the installed package version using the system package managerAffected if Tool version exists and is below 11.0.0.1225 indicates exposure
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Identify processor familyRun 'lscpu' or check /proc/cpuinfo to identify the processor model and family (Pentium, Celeron, Xeon, Core, or Itanium)Affected if Processor is an Intel Pentium, Celeron, Xeon, Core, or Itanium indicates potential exposure since all firmware versions are affected
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Check loaded microcode versionOn Linux, check 'dmesg | grep -i microcode' or 'cat /proc/cpuinfo' for microcode version; on Windows, check via 'wmic cpu get version' or BIOS toolsAffected if Microcode version is older than the Intel-provided update for this CVE (specific version varies by processor model)
User is affected if running Fedora 33/34, or using Intel Brand Verification Tool below 11.0.0.1225, or running an affected Intel processor (Pentium/Celeron/Xeon/Core/Itanium) without the corresponding microcode/firmware update applied.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data11.0.0.1225
Apply Intel processor microcode updates and firmware/BIOS updates provided by Intel and system OEMs. Keep operating systems and associated software up to date, as many platforms incorporate microcode updates through OS-level mechanisms.
Fix this in Fedora
Scoped from the published advisory
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $11,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-0086 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-0086 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data