CVE-2025-37838

/// Technical description

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().

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References