CVE-2025-37838: HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-18 · updated 2026-06-17
Weakness: CWE-416

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().

Affected products

Linux kernel: before 6.1.135; from 6.2 before 6.6.88; from 6.7 before 6.12.24; from 6.13 before 6.13.12; from 6.14 before 6.14.3 — fixed in 6.1.135, 6.12.24, 6.13.12, 6.14.3, 6.6.88

How to fix

Upgrade to a fixed version: Linux kernel 6.1.135, 6.12.24, 6.13.12, 6.14.3. Check the vendor advisory for mitigations.

References

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