CVE-2021-34378
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 · uneditedTrusty contains a vulnerability in the HDCP service TA where bounds checking in command 11 is missing. Improper restriction of operations within the bounds of a memory buffer might lead to information disclosure, denial of service, or escalation of privileges.
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 confidenceThe ARM Trusty TEE (Trusted Execution Environment) contains a bounds-checking vulnerability in the HDCP (High-bandwidth Digital Content Protection) service Trusted Application (TA). Specifically, command handler 11 lacks proper bounds validation before performing memory operations, allowing out-of-bounds memory access that could enable information disclosure, denial of service, or privilege escalation from within the trusted execution environment.
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< 32.5.1CVSS 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
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:H/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 if the system is running Nvidia Jetson LinuxRun 'cat /etc/nv_tegra_release' or check 'uname -a' for Jetson-specific kernel informationAffected if The system is a Jetson device running Nvidia Jetson Linux
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Check the Jetson Linux versionRun 'cat /etc/nv_tegra_release' and look at the L4T version number, or check the kernel version with 'uname -r'Affected if The version is below 32.5.1 (for example, 32.4.x or earlier)
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Determine if ARM Trusty TEE is enabledCheck the kernel command line for 'trusty' or examine /dev/tzdev or /dev/trusty kernel objects if they exist; also check if /vendor or /tee directories containing Trusty artifacts are presentAffected if Trusty TEE is present and running on the system
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Check if the HDCP service Trusted Application is loadedExamine Trusty TA binaries or logs for 'hdcp' service; look in /vendor/app/hdcp or similar Trusty TA directories, or check dmesg/Trusty logs for HDCP TA loading messagesAffected if The HDCP TA is loaded and active within the Trusty TEE
A system is affected if it is a Jetson Linux device running version below 32.5.1 with ARM Trusty TEE and the HDCP service TA enabled
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 data32.5.1
Apply the Trusty security update that includes proper bounds checking for command 11 in the HDCP service TA; if the HDCP service is not required, it should be disabled to reduce attack surface.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-34378 — 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-2021-34378 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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