{"cve":"CVE-2025-21870","nvd":{"published":"2025-03-27T14:15:48.543","modified":"2026-10-21T13:17:59.177","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers\n\nOther, non DAI copier widgets could have the same  stream name (sname) as\nthe ALH copier and in that case the copier->data is NULL, no alh_data is\nattached, which could lead to NULL pointer dereference.\nWe could check for this NULL pointer in sof_ipc4_prepare_copier_module()\nand avoid the crash, but a similar loop in sof_ipc4_widget_setup_comp_dai()\nwill miscalculate the ALH device count, causing broken audio.\n\nThe correct fix is to harden the matching logic by making sure that the\n1. widget is a DAI widget - so dai = w->private is valid\n2. the dai (and thus the copier) is ALH copier","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/6b6b47c1aa717a0ed3400e00a81dfea686a41d7f","https://git.kernel.org/stable/c/6fd60136d256b3b948333ebdb3835f41a95ab7ef","https://git.kernel.org/stable/c/87c8768a96092ce75cd47fe076db5080db7ac515","https://git.kernel.org/stable/c/93c6c2e5801aab09ef1ef99f248f3cd323c3f152"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2025-21870","score":0.00264,"percentile":0.18131,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}