| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-21870: ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers |
| |
| Other, non DAI copier widgets could have the same stream name (sname) as |
| the ALH copier and in that case the copier->data is NULL, no alh_data is |
| attached, which could lead to NULL pointer dereference. |
| We could check for this NULL pointer in sof_ipc4_prepare_copier_module() |
| and avoid the crash, but a similar loop in sof_ipc4_widget_setup_comp_dai() |
| will miscalculate the ALH device count, causing broken audio. |
| |
| The correct fix is to harden the matching logic by making sure that the |
| 1. widget is a DAI widget - so dai = w->private is valid |
| 2. the dai (and thus the copier) is ALH copier |
| |
| The Linux kernel CVE team has assigned CVE-2025-21870 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.0 with commit a150345aa758492e05d2934f318ce7c2566b1cfe and fixed in 6.12.17 with commit 87c8768a96092ce75cd47fe076db5080db7ac515 |
| Issue introduced in 6.0 with commit a150345aa758492e05d2934f318ce7c2566b1cfe and fixed in 6.13.5 with commit 93c6c2e5801aab09ef1ef99f248f3cd323c3f152 |
| Issue introduced in 6.0 with commit a150345aa758492e05d2934f318ce7c2566b1cfe and fixed in 6.14 with commit 6fd60136d256b3b948333ebdb3835f41a95ab7ef |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-21870 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| sound/soc/sof/ipc4-topology.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/87c8768a96092ce75cd47fe076db5080db7ac515 |
| https://git.kernel.org/stable/c/93c6c2e5801aab09ef1ef99f248f3cd323c3f152 |
| https://git.kernel.org/stable/c/6fd60136d256b3b948333ebdb3835f41a95ab7ef |
