CVE-2022-30771
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 · uneditedInitialization function in PnpSmm could lead to SMRAM corruption when using subsequent PNP SMI functions Initialization function in PnpSmm could lead to SMRAM corruption when using subsequent PNP SMI functions. This issue was discovered by Insyde engineering during a security review. Fixed in: Kernel 5.1: Version 05.17.25 Kernel 5.2: Version 05.27.25 Kernel 5.3: Version 05.36.25 Kernel 5.4: Version 05.44.25 Kernel 5.5: Version 05.52.25 https://www.insyde.com/security-pledge/SA-2022064
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 · high confidenceVulnerability in Insyde's UEFI firmware PnpSmm driver where the initialization function has a flaw that causes SMRAM (System Management RAM) corruption when subsequent PNP SMI (System Management Interrupt) functions are called. This allows potential privilege escalation to SMM level, the highest privilege mode on x86 processors.
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>= 5.1, < 5.1.05.17.25>= 5.2, < 5.2.05.27.25>= 5.3, < 5.3.05.36.25>= 5.4, < 5.4.05.44.25>= 5.5, < 5.5.05.52.25CVSS 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
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
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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Identify Insyde UEFI firmwareCheck if the system uses Insyde UEFI firmware by running `dmidecode -s bios-vendor` on Linux or `wmic bios get manufacturer` on Windows. Insyde-based systems will show Insyde as the BIOS vendor.Affected if The system manufacturer is not Insyde - this CVE only affects Insyde UEFI firmware.
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Extract Insyde Kernel versionRun `dmidecode -s bios-version` on Linux or `wmic bios get version` on Windows to obtain the firmware version string. This typically appears in format like 5.1.05.17 or similar.Affected if Unable to retrieve a version string - the firmware version cannot be determined.
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Parse the major version branchIdentify the major version branch from the version string (e.g., 5.1, 5.2, 5.3, 5.4, or 5.5). The second number after the dot indicates the branch (e.g., version 5.2.05.27 means branch 5.2).Affected if The version string does not begin with 5.1, 5.2, 5.3, 5.4, or 5.5 - these are the only affected branches.
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Compare against fixed version for your branchUsing the identified branch, check if the full version is less than the fixed version: for 5.1 check < 5.1.05.17.25, for 5.2 check < 5.2.05.27.25, for 5.3 check < 5.3.05.36.25, for 5.4 check < 5.4.05.44.25, for 5.5 check < 5.5.05.52.25.Affected if The version number is less than the fixed version for your branch - the system is vulnerable.
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Verify PnpSmm driver is presentInspect the UEFI firmware image or use vendor-provided tools to confirm the PnpSmm driver is included in the firmware build. This driver is the affected component.Affected if The PnpSmm driver is not present in the firmware - the specific attack surface may not exist.
The system is affected if it runs Insyde UEFI firmware with Kernel version 5.1 through 5.5 that is below the fixed version numbers (05.17.25, 05.27.25, 05.36.25, 05.44.25, or 05.52.25 respectively).
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.
dbcve · scoped5.1.05.17.255.2.05.27.255.3.05.36.25
Update Insyde kernel firmware to the specified fixed versions (05.17.25 for 5.1, 05.27.25 for 5.2, 05.36.25 for 5.3, 05.44.25 for 5.4, or 05.52.25 for 5.5) via vendor-provided UEFI firmware update process.
Upgrade to Insyde kernel version 05.17.25 (5.1), 05.27.25 (5.2), 05.36.25 (5.3), 05.44.25 (5.4), or 05.52.25 (5.5) depending on your current branch
- 1. Identify the current Insyde kernel version by checking the UEFI firmware version or Insyde kernel version on the affected system
- 2. Navigate to the Insyde security advisory SA-2022064 at www.insyde.com for the appropriate firmware update
- 3. Download the fixed kernel version corresponding to your current version: For kernel 5.1 upgrade to 05.17.25 or later; For kernel 5.2 upgrade to 05.27.25 or later; For kernel 5.3 upgrade to 05.36.25 or later; For kernel 5.4 upgrade to 05.44.25 or later; For kernel 5.5 upgrade to 05.52.25 or later
- 4. Apply the firmware update through the vendor's standard BIOS/firmware update process (typically via flashing the firmware through vendor tools or UEFI update utility)
- 5. Verify the update was successful by confirming the new kernel version is installed
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-30771 — 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-2022-30771 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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