CVE-2026-43241

/* * PoC Concept for CVE-2026-43241 * This code demonstrates the logic of the vulnerability. * Actual exploitation requires a specific hardware environment (Switchtec). */ #include <stdio.h> #include <stdlib.h> // Simulating the vulnerable structure #define MAX_MWS 10 // Example limit int mw_sizes[MAX_MWS]; // The array being accessed // Simulating the vulnerable function in ntb_hw_switchtec void vulnerable_ntb_config(int num_mws, int index) { // Vulnerability: Lack of bounds check on 'index' against 'num_mws' or MAX_MWS // The patch adds: if (index >= num_mws) return error; printf("Attempting to access mw_sizes index %d (Limit: %d)\n", index, num_mws); // This line causes the crash/leak if index is invalid int size = mw_sizes[index]; // Out-of-bounds access printf("MW Size: %d\n", size); } int main() { // Scenario: Configuration allows num_mws to be set such that // a specific valid-looking index is actually out of bounds for the array. // Or simply passing an index > MAX_MWS. printf("PoC: Triggering Array Index Out of Bounds\n"); // Initialize array for(int i=0; i<MAX_MWS; i++) mw_sizes[i] = i * 1024; // Trigger the bug with an invalid index // In the real vulnerability, this depends on NTB configuration logic. vulnerable_ntb_config(MAX_MWS, MAX_MWS + 1); return 0; }

{"cve": {"id": "CVE-2026-43241", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:44.460", "lastModified": "2026-05-11T14:26:10.567", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntb: ntb_hw_switchtec: Fix array-index-out-of-bounds access\n\nNumber of MW LUTs depends on NTB configuration and can be set to MAX_MWS,\nThis patch protects against invalid index out of bounds access to mw_sizes\nWhen invalid access print message to user that configuration is not valid."}], "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:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.10.252", "matchCriteriaId": "0DACC27E-2C7E-4A63-8C6D-D02E7C1191F3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.202", "matchCriteriaId": "4002FC2B-1456-4666-B240-0EBF590C4671"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.165", "matchCriteriaId": "797C7F46-D0BE-4FB8-A502-C5EF8E6B6654"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.128", "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.75", "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0e930420945106151c6eb3d7837b4e6154e9b144", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/2346856b74823a2a78109002e479a3d02526a9ce", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/348e1ac9ad983ed7e62de14e1daf47f1695a4ce9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/47ce292dd45dc689747c40603222691638919189", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/740945de896021b9a859e71f38f6aea72a6393cf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/85c9daa1f8319bbb3dfee71dc6a2f969cd3b4c92", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c8ba7ad2cc1c7b90570aa347b8ebbe279f1eface", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ee02c4f980c91820845dd8e469ec7dc670ab6d9d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}