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Linux KernelOperating system · Linux

CVE-2025-39937

MEDIUM · 5.5 CVSS v3.1 Published 2025-10-04
Fix available
A fix is available. Upgrade to 5.4.300 / 5.10.245 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

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 · unedited
In the Linux kernel, the following vulnerability has been resolved: net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer Since commit 7d5e9737efda ("net: rfkill: gpio: get the name and type from device property") rfkill_find_type() gets called with the possibly uninitialized "const char *type_name;" local variable. On x86 systems when rfkill-gpio binds to a "BCM4752" or "LNV4752" acpi_device, the rfkill->type is set based on the ACPI acpi_device_id: rfkill->type = (unsigned)id->driver_data; and there is no "type" property so device_property_read_string() will fail and leave type_name uninitialized, leading to a potential crash. rfkill_find_type() does accept a NULL pointer, fix the potential crash by initializing type_name to NULL. Note likely sofar this has not been caught because: 1. Not many x86 machines actually have a "BCM4752"/"LNV4752" acpi_device 2. The stack happened to contain NULL where type_name is stored

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
How this class of weakness works · CWE-476

The code follows a pointer that is null, crashing the process. An attacker who can reliably trigger it turns the crash into a denial of service. The fix is checking for null before use and handling the failure path gracefully.

General guidance for the null pointer dereference class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Affected:>= 4.6, < 5.4.300>= 5.5, < 5.10.245>= 5.11, < 5.15.194>= 5.16, < 6.1.154>= 6.2, < 6.6.108>= 6.7, < 6.12.49>= 6.13, < 6.16.9= 6.17

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
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

dbcve · scoped
Upgrade available Upgrade to 5.4.300 / 5.10.245 / 5.15.194 or later
Fixed in 5.4.3005.10.2455.15.194
Vendor patch git.kernel.org →
Recommended fix High confidence

Upgrade to kernel 5.4.300, 5.10.245, 5.15.194, or 6.1.154 (or later) depending on which version branch you are on

  1. Identify the current kernel version using `uname -r` or `cat /proc/version`
  2. If running kernel >= 4.6 and < 5.4.300, upgrade to kernel 5.4.300 or later
  3. If running kernel >= 5.5 and < 5.10.245, upgrade to kernel 5.10.245 or later
  4. If running kernel >= 5.11 and < 5.15.194, upgrade to kernel 5.15.194 or later
  5. If running kernel >= 5.16 and < 6.1.154, upgrade to kernel 6.1.154 or later
  6. Alternatively, apply the vendor patch commit 184f608a68f96794e8fe58cd5535014d53622cde which initializes the `type_name` variable to NULL in the rfkill-gpio driver before calling rfkill_find_type()
Caveat Kernel upgrades may require rebuilding out-of-tree kernel modules; ensure driver compatibility

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $2,850. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-39937 in production — separate from our analysis above.

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