CVE-2025-37838: HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition
First published: Fri Apr 18 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition In the ssi_protocol_probe() function, &ssi->work is bound with ssip_xmit_work(), In ssip_pn_setup(), the ssip_pn_xmit() function within the ssip_pn_ops structure is capable of starting the work. If we remove the module which will call ssi_protocol_remove() to make a cleanup, it will free ssi through kfree(ssi), while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | ssip_xmit_work ssi_protocol_remove | kfree(ssi); | | struct hsi_client *cl = ssi->cl; | // use ssi Fix it by ensuring that the work is canceled before proceeding with the cleanup in ssi_protocol_remove().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel |
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Reference Links
- https://git.kernel.org/stable/c/ae5a6a0b425e8f76a9f0677e50796e494e89b088
- https://git.kernel.org/stable/c/834e602d0cc7c743bfce734fad4a46cefc0f9ab1
- https://git.kernel.org/stable/c/4b4194c9a7a8f92db39e8e86c85f4fb12ebbec4f
- https://git.kernel.org/stable/c/e3f88665a78045fe35c7669d2926b8d97b892c11
- https://git.kernel.org/stable/c/58eb29dba712ab0f13af59ca2fe545f5ce360e78
- https://git.kernel.org/stable/c/d58493832e284f066e559b8da5ab20c15a2801d3
Frequently Asked Questions
What is the severity of CVE-2025-37838?
CVE-2025-37838 has been classified as a critical vulnerability due to its potential to allow exploitation through a race condition.
How do I fix CVE-2025-37838?
To fix CVE-2025-37838, update your Linux kernel to the latest available version that addresses this vulnerability.
What systems are affected by CVE-2025-37838?
CVE-2025-37838 affects the Linux kernel, specifically systems running versions that include the vulnerable ssi_protocol driver.
What is the impact of CVE-2025-37838?
The impact of CVE-2025-37838 includes potential denial of service or arbitrary code execution due to a use after free vulnerability.
Is there a workaround for CVE-2025-37838?
Currently, there are no known workarounds for CVE-2025-37838, so applying the kernel update is the recommended action.
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