Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.3, < 6.6.80 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0505ff2936f166405d81d0d454a81d9c14124344Patch
- https://git.kernel.org/stable/c/915e34d5ad35a6a9e56113f852ade4a730fb88f0Patch
- https://git.kernel.org/stable/c/940d15254d2216b585558bcf36312da50074e711Patch
- https://git.kernel.org/stable/c/e26e8ac27351f457091459a0a355bacd06d5bb2bPatch
FAQ
What is CVE-2025-21856?
CVE-2025-21856 is a vulnerability with a CVSS score of 7.8 (HIGH). 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...
How severe is CVE-2025-21856?
CVE-2025-21856 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-21856?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.