Use-after-free in Linux kernel - CVE-2026-43437
Published: May 8, 2026
Vulnerability identifier: #VU130736
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43437
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in snd_pcm_drain() when handling a linked stream runtime after releasing the stream lock. A local user can trigger a concurrent close() on the linked stream's file descriptor to cause a denial of service.
The issue occurs because the drain path dereferences stale runtime fields from a linked stream after the runtime can be freed by concurrent unlink and detach operations.
How to mitigate CVE-2026-43437
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/4a758e9a1f5ed722f83c4dd35f867fe811553bcb
- https://git.kernel.org/stable/c/629cf09464cf98670996ea5c191dc9743e6f3f00
- https://git.kernel.org/stable/c/9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6
- https://git.kernel.org/stable/c/9baee36e8c5443411c4629afabafaff8a46a23fd
- https://git.kernel.org/stable/c/ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432
- https://git.kernel.org/stable/c/c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694
- https://git.kernel.org/stable/c/fc71f888994569f87d5bee20b1ac6c9c1e3a7a79