Linux KernelOperating system · Linux
CVE-2023-20662
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 · uneditedIn wlan, there is a possible out of bounds write due to an integer overflow. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07560765; Issue ID: ALPS07560765.
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 confidenceIn the WLAN component, an integer overflow vulnerability allows an out-of-bounds write, which can be exploited for local privilege escalation. The flaw requires System execution privileges to exploit but needs no user interaction, indicating exploitation likely occurs from an already-privileged process to gain additional access.
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
Linux KernelOperating system
= 4.19= 11.0= 12.0= 13.0= 3.1= 3.3= 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
- 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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Check kernel versionRun `uname -a` or read `/proc/version` to identify the installed Linux kernel versionAffected if Kernel version is exactly 4.19
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Check Android versionRun `getprop ro.build.version.release` or check Settings > About Phone > Android versionAffected if Android version is 11.0, 12.0, or 13.0
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Check Yocto Project versionCheck `/etc/os-release` for YOCTO_VERSION or examine the build configuration filesAffected if Yocto version is 3.1, 3.3, or 4.0
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Identify MediaTek WLAN componentExamine loaded kernel modules with `lsmod` and check dmesg for MediaTek WLAN driver messages (e.g., mt7621, mt7603, or similar MediaTek wireless chipsets)Affected if System uses a MediaTek ALPS-based WLAN driver component
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Confirm driver version if accessibleCheck `/sys/module` or driver-specific paths (e.g., `/sys/class/net/wlan*/device/driver`) for MediaTek WLAN driver version informationAffected if WLAN driver version corresponds to unpatched MediaTek ALPS firmware
A system is affected if it runs any of the listed kernel/Android/Yocto versions AND uses MediaTek ALPS-based WLAN hardware, as the integer overflow in this specific WLAN component requires that MediaTek WLAN driver to be present.
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 patch ALPS07560765 to update the WLAN firmware/driver. This is a vendor-supplied patch for MediaTek ALPS-based systems that addresses the integer overflow in the WLAN component.
Fix this in Linux Kernel
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,808.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-20662 — 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-2023-20662 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
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