Use-after-free in Linux kernel - CVE-2026-43459
Published: May 8, 2026
Vulnerability identifier: #VU130726
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-2026-43459
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 use-after-free in snd_soc_dapm_stream_event() when handling delayed work during sound card unbind while a PCM stream is open. A local user can trigger a sound card unbind in this state to cause a denial of service.
The issue occurs because a PCM close path can schedule new delayed work after the earlier workqueue flush and before DAPM widgets are removed.
How to mitigate CVE-2026-43459
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/231568afbc0cd25b8fb2a94ebf9738eabe1cf007
- https://git.kernel.org/stable/c/317a9298c54bb00319da73e5a7179f00e67fcbdf
- https://git.kernel.org/stable/c/3887e514978d28216246360b46a9cb534969eb5a
- https://git.kernel.org/stable/c/7d33e6140945482a07f8089ee86e13e02553ffdb
- https://git.kernel.org/stable/c/95bc5c225513fc3c4ce169563fb5e3929fbb938b
- https://git.kernel.org/stable/c/bf80a89da97285d9b877e0c6995e870d46b8025c
- https://git.kernel.org/stable/c/c054f0607c8bb1b1aa529bc109e4149298a1cccd
- https://git.kernel.org/stable/c/eab71e11ce2447c1e01809cbc11eab4234cf8dc8