Use-after-free in Linux kernel - CVE-2026-31576
Published: April 25, 2026
Vulnerability identifier: #VU127817
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-2026-31576
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 the hackrf driver when handling ioctl and release operations on an already-open device file after device unregistration. A local user can keep a device file descriptor open and trigger ioctl or close operations to cause a denial of service.
New open() calls are blocked after device unregistration, but already-open file descriptors and in-flight I/O remain valid until the final reference is released.
How to mitigate CVE-2026-31576
Install security update from vendor's repository.