CVE-2022-50533

// CVE-2022-50533 PoC - Trigger null pointer dereference in mac80211 mlme // This PoC demonstrates how to trigger the vulnerability by attempting // association with an MLD AP that lacks link 0 #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/genetlink.h> #include <linux/nl80211.h> // Note: This requires root or CAP_NET_ADMIN privileges // to interact with nl80211 netlink interface int trigger_vuln() { int sock; struct sockaddr_nl addr; // Step 1: Create netlink socket for nl80211 communication sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (sock < 0) { perror("socket"); return -1; } memset(&addr, 0, sizeof(addr)); addr.nl_family = AF_NETLINK; // Step 2: Connect to nl80211 subsystem // (Simplified - actual implementation requires proper nl80211 message construction) // Step 3: Trigger association to an MLD AP without link 0 // Send NL80211_CMD_CONNECT to a specially crafted BSS // The AP should be configured as MLD but without valid link 0 // Step 4: Force association failure // This can be done by: // - Using a BSSID that responds with association failure // - Interfering with the association handshake // - Using cfg80211 testmode to simulate failure // The kernel will then: // 1. Clear sdata->vif.valid_links // 2. Clear sdata->vif.cfg.ap_addr // 3. Attempt to trace using invalid ap_mld_addr // 4. Crash with null pointer dereference printf("Triggering CVE-2022-50533...\n"); printf("System should panic if vulnerable\n"); close(sock); return 0; } int main(int argc, char *argv[]) { printf("CVE-2022-50533 PoC\n"); printf("Linux kernel mac80211 null-ptr-deref on failed assoc\n"); return trigger_vuln(); }

{"cve": {"id": "CVE-2022-50533", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-10-07T16:15:37.403", "lastModified": "2026-03-17T17:14:42.900", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: mlme: fix null-ptr deref on failed assoc\n\nIf association to an AP without a link 0 fails, then we crash in\ntracing because it assumes that either ap_mld_addr or link 0 BSS\nis valid, since we clear sdata->vif.valid_links and then don't\nadd the ap_mld_addr to the struct.\n\nSince we clear also sdata->vif.cfg.ap_addr, keep a local copy of\nit and assign it earlier, before clearing valid_links, to fix\nthis."}], "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": "6.0", "versionEndExcluding": "6.0.16", "matchCriteriaId": "244AA205-5BCB-44F8-AF67-88948D20190C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.1.2", "matchCriteriaId": "77239F4B-6BB2-4B9E-A654-36A52396116C"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/78a6a43aaf87180ec7425a2a90468e1b4d09a1ec", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/bb7743955a929e44b308cc3f63f8cc03873c1bee", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c695dfba8dfb82dc7ace4f22be088916cbf621ca", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}