CVE-2026-43110

/* * Conceptual PoC for CVE-2026-43110 * This code simulates sending a malformed firmware event to trigger * the missing bsscfgidx validation in brcmf_fweh_handle_if_event. * Note: Actual exploitation requires interaction with the vulnerable driver. */ #include <stdio.h> #include <string.h> #include <stdlib.h> // Mock structure representing the firmware event header struct brcmf_event_msg { __u16 version; __u16 flags; __u32 event_type; __u32 status; __u32 reason; __u8 ifidx; // Validated index __u8 bsscfgidx; // The vulnerable field (missing validation) __u8 addr[ETH_ALEN]; char ifname[IFNAMSIZ]; }; void trigger_vulnerability() { struct brcmf_event_msg malicious_event; memset(&malicious_event, 0, sizeof(malicious_event)); // Setup normal fields malicious_event.version = 1; malicious_event.ifidx = 0; // Valid interface index // Set bsscfgidx to a value likely outside the bounds of drvr->iflist[] // Assuming drvr->iflist has a small size (e.g., < 255) malicious_event.bsscfgidx = 0xFF; printf("Sending malicious event with bsscfgidx: %d\n", malicious_event.bsscfgidx); // In a real scenario, this would be passed to the driver via ioctl or firmware interaction // brcmf_fweh_handle_if_event(drvr, &malicious_event, ...); // This would cause drvr->iflist[0xFF] access -> Out of Bounds } int main() { trigger_vulnerability(); return 0; }

{"cve": {"id": "CVE-2026-43110", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T10:16:24.690", "lastModified": "2026-05-08T20:14:50.097", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: validate bsscfg indices in IF events\n\nbrcmf_fweh_handle_if_event() validates the firmware-provided interface\nindex before it touches drvr->iflist[], but it still uses the raw\nbsscfgidx field as an array index without a matching range check.\n\nReject IF events whose bsscfg index does not fit in drvr->iflist[]\nbefore indexing the interface array.\n\n[add missing wifi prefix]"}], "metrics": {"cvssMetricV31": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "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": "3.9", "versionEndExcluding": "6.6.136", "matchCriteriaId": "CE6532FC-CF36-43FE-8110-CCB1D829038D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.83", "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.24", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.14", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1ae1e1caa428844e481231f6dbe9b4f475f1d52d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/304950a467d83678bd0b0f46331882e2ac23b12d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/3ec7437e9d11374105c2c4e47ae671537729d7e6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/9fca68c2512a362cad258e4df12a307bb2ee4b8e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b427c2b05222db36d32ee141609de6128e9091bb", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}