CVE-2023-52439

A flaw was found in the Linux kernel’s uio subsystem. A use-after-free memory flaw in the uio_open functionality allows a local user to crash or escalate their privileges on the system.

The bug could happen only if uio being used (userspace driver core code that allows userspace programs easy access to kernel interrupts and memory locations, allowing some drivers to be written in userspace). Since the bug happens during loading or unloading of uio (that is privileged operation), the security impact is limited.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent module uio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.