# CVE-2026-53242: ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams

CVE-2026-53242 is fixed in 35 products on 1 platform, first by DEBIAN-CVE-2026-53242, released June 25, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-53242
- Priority: High
- CVSS: 7.8 (Moderate)
- EPSS: 0.0010
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 25, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53242

## Description

In the Linux kernel, the following vulnerability has been resolved:  ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams  snd_pcm_drain() uses init_waitqueue_entry which does not clear entry.prev/next, and add_wait_queue with a conditional remove_wait_queue that is skipped when to_check is no longer in the group after concurrent UNLINK.  The orphaned wait entry remains on the unlinked substream sleep queue.  On the next drain iteration, add_wait_queue adds the entry to a new queue while still linked on the old one, corrupting both lists.  A subsequent wake_up dereferences NULL at the func pointer (mapped from the spinlock at offset 0 of the misinterpreted wait_queue_head_t), causing a kernel panic.  Replace init_waitqueue_entry/add_wait_queue/conditional remove_wait_queue with init_wait_entry/prepare_to_wait/ finish_wait.  init_wait_entry clears prev/next via INIT_LIST_HEAD on each iteration and sets autoremove_wake_function which auto-removes the entry on wake-up.  finish_wait safely handles both the already-removed and still-queued cases.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | bpftool ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-64kb sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 |
| Linux | kernel-azure opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-azure sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-azure sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 |
| Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-default sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-default sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23237-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23237-1.md) | Aug 11, 2026 |
| Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.37.1.160000.2.19 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.73.2.150700.17.41.4 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-default-base sles 16.0 | 6.12.0-160000.37.1.160000.2.19 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 |
| Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.73.1 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-docs sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 |
| Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 |
| Linux | kernel-livepatch-SLE15-SP7-RT_Update_18 sles 15.7 | 1-150700.1.5.1 | [SUSE-SU-2026:3130-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3130-1.md) | Jul 20, 2026 |
| Linux | kernel-livepatch-SLE15-SP7_Update_19 sles 15.7 | 1-150700.15.3.4 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 |
| Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-source sles 15.7 | 6.4.0-150700.53.73.1 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-source sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 |
| Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.73.1 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-syms sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 |
| Linux | kernel-uek ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-container ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-container ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-core ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-core ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-devel ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-devel ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-doc ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-doc ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-modules ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-modules ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k-core ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k-core ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k-devel ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k-devel ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k-modules ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k-modules ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k-modules-extra ol 8 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-uek64k-modules-extra ol 9 | 0:5.15.0-325.220.5.el9uek | [ELSA-2026-500377](https://patchblox.com/security/data/fix/linux/elsa-2026-500377.md) | Oct 7, 2026 |
| Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 |
| Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 |
| Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.176-1 | [DEBIAN-CVE-2026-53242](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53242.md) | Jun 25, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.94-1 | [DEBIAN-CVE-2026-53242](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53242.md) | Jun 25, 2026 |
| Linux | linux Debian 14 | 7.0.13-1 | [DEBIAN-CVE-2026-53242](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53242.md) | Jun 25, 2026 |

---

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