CVE-2025-38210 Information

Jul 05, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

configfs-tsm-report: Fix NULL dereference of tsm_ops

Unlike sysfs the lifetime of configfs objects is controlled by userspace. There is no mechanism for the kernel to find and delete all created config-items. Instead the configfs-tsm-report mechanism has an expectation that tsm_unregister() can happen at any time and cause established config-item access to start failing.

That expectation is not fully satisfied. While tsm_report_read() tsm_report_isis_bin_visible() and tsm_report_make_item() safely fail if tsm_ops have been unregistered tsm_report_privlevel_store() tsm_report_provider_show() fail to check for ops registration. Add the missing checks for tsm_ops having been removed.

Now in supporting the ability for tsm_unregister() to always succeed it leaves the problem of what to do with lingering config-items. The expectation is that the admin that arranges for the ->remove() (unbind) of the $tsm_arch-guest driver is also responsible for deletion of all open config-items. Until that deletion happens ->probe() (reload / bind) of the $tsm_arch-guest driver fails.

This allows for emergency shutdown / revocation of attestation interfaces and requires coordinated restart.

Reference

https://git.kernel.org/stable/c/015f04ac884a454d4d8aaa7b67758f047742b1cf https://git.kernel.org/stable/c/cefbafcbdef011d6ef9414902311afdfba3c33eb https://git.kernel.org/stable/c/fba4ceaa242d2bdf4c04b77bda41d32d02d3925d

CNNVD-202507-476 (Published: 2025-07-04)

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