UBUNTU-CVE-2025-21856
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.
02 / AFFECTED SOFTWARE
Affected packages
28 explicit affected versions
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23 explicit affected versions
5 explicit affected versions
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32 explicit affected versions
7 explicit affected versions
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14 explicit affected versions
18 explicit affected versions
3 explicit affected versions
16 explicit affected versions
43 explicit affected versions
11 explicit affected versions
35 explicit affected versions
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13 explicit affected versions
21 explicit affected versions
6 explicit affected versions
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1 explicit affected versions
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11 explicit affected versions
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/915e34d5ad35a6a9e56113f852ade4a730fb88f0
- 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
- https://ubuntu.com/security/CVE-2025-21856
- https://ubuntu.com/security/notices/USN-7521-1
- https://ubuntu.com/security/notices/USN-7521-2
- https://ubuntu.com/security/notices/USN-7521-3
- https://ubuntu.com/security/notices/USN-7703-1
- https://ubuntu.com/security/notices/USN-7703-2
- https://ubuntu.com/security/notices/USN-7703-3
- https://ubuntu.com/security/notices/USN-7703-4
- https://ubuntu.com/security/notices/USN-7719-1
- https://ubuntu.com/security/notices/USN-7737-1
- https://www.cve.org/CVERecord?id=CVE-2025-21856