CVE-2021-30269
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 · uneditedPossible null pointer dereference due to lack of TLB validation for user provided address in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Voice & Music, Snapdragon Wired Infrastructure and Networking
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 confidenceA null pointer dereference vulnerability exists in multiple Qualcomm Snapdragon processor families due to insufficient validation of user-supplied addresses before TLB (Translation Lookaside Buffer) operations. An attacker providing a crafted address could trigger a null pointer dereference, potentially leading to denial of service or potentially code execution in some contexts.
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 dataall versionsall versionsall versionsall 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
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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 the Qualcomm chip modelCheck the device hardware specifications, boot logs, or system information to determine the specific Qualcomm Snapdragon chip or firmware module name (such as Ar8031, Ar8035, Csra6620, Csra6640, Csrb31024, Fsm10055, Fsm10056, or Mdm9150)Affected if The device uses any of the listed Qualcomm firmware modules (Ar8031, Ar8035, Csra6620, Csra6640, Csrb31024, Fsm10055, Fsm10056, Mdm9150)
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Determine the firmware versionAccess the firmware version through device diagnostic interfaces, boot logs, FCC certification documents, or manufacturer specifications for the identified Qualcomm chip or moduleAffected if The firmware version cannot be determined or is any version (all versions of the affected products are vulnerable)
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Verify the TLB operation contextConfirm whether the device performs TLB (Translation Lookaside Buffer) operations, which is typical in processors with memory management units. This is inherent to the affected Snapdragon processor architecture.Affected if The device executes on affected Qualcomm Snapdragon hardware that performs TLB operations
A device is affected if it incorporates any of the listed Qualcomm firmware modules (Ar8031, Ar8035, Csra6620, Csra6640, Csrb31024, Fsm10055, Fsm10056, Mdm9150) regardless of version, as all versions of these products contain the vulnerability.
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 dataApply the vendor-provided firmware/security patch from Qualcomm to affected Snapdragon processors. Device manufacturers using affected Snapdragon chips should obtain and deploy the firmware update through their normal update mechanisms.
- Consultation8.0 h
- Implementation16.0 h
- Testing24.0 h
- Review / QA12.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $16,384.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-30269 — 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-2021-30269 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