CVE-2025-21856

Published: March 13, 2025Last modified: March 13, 2025

Description

In the Linux kernel, the following vulnerability has been resolved: s390/ism: add release function for struct device According to device_release() in /drivers/base/core.c, a device without a release function is a broken device and must be fixed. The current code directly frees the device after calling device_add() without waiting for other kernel parts to release their references. Thus, a reference could still be held to a struct device, e.g., by sysfs, leading to potential use-after-free issues if a proper release function is not set.

Severity score breakdown

Status

References

• https://git.kernel.org/stable/c/0505ff2936f166405d81d0d454a81d9c14124344
• https://git.kernel.org/stable/c/915e34d5ad35a6a9e56113f852ade4a730fb88f0
• https://git.kernel.org/stable/c/940d15254d2216b585558bcf36312da50074e711
• https://git.kernel.org/stable/c/e26e8ac27351f457091459a0a355bacd06d5bb2b