PT-2026-43958 · Linux · Linux

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-46090

NVD

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

In the Linux kernel, the following vulnerability has been resolved:

ALSA: aloop: Fix peer runtime UAF during format-change stop

loopback check format() may stop the capture side when playback starts with parameters that no longer match a running capture stream. Commit 826af7fa62e3 ("ALSA: aloop: Fix racy access at PCM trigger") moved the peer lookup under cable->lock, but the actual snd pcm stop() still runs after dropping that lock.

A concurrent close can clear the capture entry from cable->streams[] and detach or free its runtime while the playback trigger path still holds a stale peer substream pointer.

Keep a per-cable count of in-flight peer stops before dropping cable->lock, and make free cable() wait for those stops before detaching the runtime. This preserves the existing behavior while making the peer runtime lifetime explicit.

Fix

Related Identifiers

CVE-2026-46090

Affected Products

Linux

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-46090 · Security Note
• https://git.kernel.org/stable/c/e5c33cdc6f402eab8abd36ecf436b22c9d3a8aff · Note
• https://git.kernel.org/stable/c/5d45e34bf001344e2966dabca1897561bbc9e913 · Note
• https://git.kernel.org/stable/c/bdd9503c3d222d2735b56c7a8b4422ccf3de6e5c · Note
• https://git.kernel.org/stable/c/03f52a9c170431e8f10e156b9dc0dae80b3e9198 · Note