CVE-2023-4260
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 · uneditedPotential off-by-one buffer overflow vulnerability in the Zephyr fuse file system.
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 potential off-by-one buffer overflow vulnerability exists in the Zephyr RTOS FUSE (Filesystem in Userspace) implementation. This class of flaw occurs when a loop or memory operation exceeds a buffer boundary by one byte, potentially allowing adjacent memory corruption that could be leveraged for code execution or denial of service.
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<= 3.4.0CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 Zephyr RTOS versionCheck the kernel version reported by the Zephyr system, or inspect the build configuration (typically in prj.conf or Kconfig) for the ZEPHYR_VERSION or KERNEL_VERSION macros. Alternatively, check the west manifest or version file in the Zephyr source tree.Affected if The installed or compiled Zephyr version is 3.4.0 or lower.
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Verify FUSE module is enabledExamine the build configuration files (prj.conf, defconfig, or Kconfig) for CONFIG_FUSE or similar FUSE-related configuration options. Look for entries like CONFIG_FUSE_FUSE or CONFIG_FUSE_VFS.Affected if FUSE (Filesystem in Userspace) support is enabled in the Zephyr build configuration.
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Inspect FUSE implementation codeLocate the FUSE source files in the Zephyr codebase (typically under subsys/fs/fuse.c or similar paths in the filesystem module). Check the loop boundaries and buffer handling in functions performing read/write operations.Affected if The FUSE implementation code contains loops or memory operations that interact with buffers and could exceed boundaries by one byte.
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Check for FUSE device configurationReview the device tree or board configuration files for FUSE device definitions. Look for any custom FUSE device setups or overlays that might instantiate the FUSE subsystem.Affected if A FUSE device or filesystem instance is configured and will be initialized at runtime.
The environment is affected if it runs Zephyr version 3.4.0 or lower with FUSE (Filesystem in Userspace) enabled and configured in the build.
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 official Zephyr project patch when available, update to the latest patched Zephyr RTOS version, and verify FUSE functionality post-update.
- Consultation4.0 h
- Implementation8.0 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 $7,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-4260 — 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-2023-4260 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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