Use-after-free in Linux kernel - CVE-2026-31701
Published: May 2, 2026
Vulnerability identifier: #VU128986
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-2026-31701
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 the ALSA caiaq driver card free callback when handling device teardown after a disconnect. A local user can trigger asynchronous cleanup after the USB device has been disconnected to cause a denial of service.
The issue occurs because the driver stores a pointer to the parent USB device without taking a reference, and the cleanup path may dereference the freed usb_device.
How to mitigate CVE-2026-31701
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/1d9be95aee6c6246a21752e60c9519902649f482
- https://git.kernel.org/stable/c/59b622a043cffc58b7638cd85ae6c30a0904f8e6
- https://git.kernel.org/stable/c/6473ed16df1fe88051140611b3eb9a49be7f429e
- https://git.kernel.org/stable/c/80bb50e2d459213cccff3111d5ef98ed4238c0d5
- https://git.kernel.org/stable/c/f6634af5de728a46792f674a66d7843570cb68f7