UBUNTU-CVE-2025-37838
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().
02 / AFFECTED SOFTWARE
Affected packages
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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().
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/e3f88665a78045fe35c7669d2926b8d97b892c11
- https://git.kernel.org/stable/c/4b4194c9a7a8f92db39e8e86c85f4fb12ebbec4f
- https://git.kernel.org/stable/c/834e602d0cc7c743bfce734fad4a46cefc0f9ab1
- https://git.kernel.org/stable/c/ae5a6a0b425e8f76a9f0677e50796e494e89b088
- https://git.kernel.org/stable/c/e3f88665a78045fe35c7669d2926b8d97b892c11
- https://ubuntu.com/security/CVE-2025-37838
- https://ubuntu.com/security/notices/USN-7594-1
- https://ubuntu.com/security/notices/USN-7594-2
- https://ubuntu.com/security/notices/USN-7594-3
- https://ubuntu.com/security/notices/USN-7654-1
- https://ubuntu.com/security/notices/USN-7654-2
- https://ubuntu.com/security/notices/USN-7654-3
- https://ubuntu.com/security/notices/USN-7654-4
- https://ubuntu.com/security/notices/USN-7654-5
- https://ubuntu.com/security/notices/USN-7655-1
- https://ubuntu.com/security/notices/USN-7686-1
- https://ubuntu.com/security/notices/USN-7711-1
- https://ubuntu.com/security/notices/USN-7712-1
- https://ubuntu.com/security/notices/USN-7712-2
- https://ubuntu.com/security/notices/USN-7853-1
- https://ubuntu.com/security/notices/USN-7853-2
- https://ubuntu.com/security/notices/USN-7853-3
- https://ubuntu.com/security/notices/USN-7854-1
- https://ubuntu.com/security/notices/USN-7861-1
- https://ubuntu.com/security/notices/USN-7861-2
- https://ubuntu.com/security/notices/USN-7861-3
- https://ubuntu.com/security/notices/USN-7861-5
- https://ubuntu.com/security/notices/USN-7863-1
- https://ubuntu.com/security/notices/USN-7864-1
- https://ubuntu.com/security/notices/USN-7865-1
- https://ubuntu.com/security/notices/USN-7874-1
- https://ubuntu.com/security/notices/USN-7874-2
- https://ubuntu.com/security/notices/USN-7874-3
- https://ubuntu.com/security/notices/USN-7935-1
- https://ubuntu.com/security/notices/USN-7937-1
- https://ubuntu.com/security/notices/USN-7939-1
- https://ubuntu.com/security/notices/USN-7939-2
- https://ubuntu.com/security/notices/USN-7940-1
- https://ubuntu.com/security/notices/USN-7940-2
- https://www.cve.org/CVERecord?id=CVE-2025-37838