CVE-2025-39937: net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer
Vulnerability summary
CVE-2025-39937 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.1% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 44 · Related 39Timeline
- 04-10-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
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
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.15%
Chance of exploitation in the next 30 days
Percentile
4%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.15% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu147 products
- linuxAll versions (No fix recorded) | < 5.15.0-170.180 | < 6.8.0-106.106
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1100.107 | < 6.8.0-1050.53
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 7d5e9737efda16535e5b54bd627ef4881d11d31f, < 184f608a68f96794e8fe58cd5535014d53622cde | ≥ 7d5e9737efda16535e5b54bd627ef4881d11d31f, < 8793e7a8e1b60131a825457174ed6398111daeb7 | ≥ 7d5e9737efda16535e5b54bd627ef4881d11d31f, < ada2282259243387e6b6e89239aeb4897e62f051 | ≥ 7d5e9737efda16535e5b54bd627ef4881d11d31f, < 47ade5f9d70b23a119ec20b1c6504864b2543a79 | ≥ 7d5e9737efda16535e5b54bd627ef4881d11d31f, < 689aee35ce671aab752f159e5c8e66d7685e6887 | ≥ 7d5e9737efda16535e5b54bd627ef4881d11d31f, < 21ba85d9d508422ca9e6698463ff9357c928c22d | ≥ 7d5e9737efda16535e5b54bd627ef4881d11d31f, < 21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d | ≥ 7d5e9737efda16535e5b54bd627ef4881d11d31f, < b6f56a44e4c1014b08859dcf04ed246500e310e5 | 4.6
- linux_kernel≥ 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:rc1 | 6.17:rc2 | 6.17:rc3 | 6.17:rc4 | 6.17:rc5 | 6.17:rc6
Debian1 product
- linux< 6.1.158-1 | < 6.12.57-1 | < 6.16.9-1
3 vendors · 150 products
