CVE-2024-7139
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 · uneditedDue to an unchecked buffer length, a specially crafted L2CAP packet can cause a buffer overflow. This buffer overflow triggers an assert, which results in a temporary denial of service. If a watchdog timer is not enabled, a hard reset is required to recover the device.
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 buffer overflow vulnerability exists in the L2CAP packet handling logic of affected Bluetooth firmware due to unchecked buffer length when processing incoming packets. The overflow triggers an assertion failure, causing a denial of service that may require a hard reset if no watchdog timer is enabled.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 Bluetooth firmware versionUse system commands to retrieve the Bluetooth controller firmware version (e.g., btmgmt info, hciconfig -a, or vendor-specific tools like intel_bluetooth for Intel adapters)Affected if The installed firmware version matches the vulnerable version range published by the device vendor
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Confirm Bluetooth is enabledCheck if the Bluetooth controller is powered on and actively running (commands like rfkill list, btmgmt power on, or system Bluetooth service status)Affected if Bluetooth is powered on and the L2CAP stack is initialized
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Verify L2CAP protocol supportInspect whether L2CAP is loaded or active in the Bluetooth stack (check hcidump -l, btmon logs, or verify l2cap module presence with lsmod | grep l2cap)Affected if L2CAP protocol handling is enabled in the Bluetooth stack
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Check watchdog timer statusExamine if a hardware or software watchdog timer is configured to reset the system on assertion failures (check watchdog daemon status, hardware watchdog config in /dev/watchdog, or platform-specific watchdog settings)Affected if No watchdog timer is enabled, meaning the device would require manual hard reset after the denial of service
The environment is affected if the Bluetooth firmware version falls within the vendor-identified vulnerable range AND Bluetooth with L2CAP is actively enabled, with no watchdog timer to auto-recover from the assertion failure.
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 dataImplement proper bounds checking on L2CAP packet length fields before buffer operations; enable watchdog timer as a temporary mitigation until the fix is deployed.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-7139 — 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-2024-7139 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
- No weaponised exploit code, or anything meant to cause harm
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