CVE-2025-21928

In the Linux kernel, the following vulnerability has been resolved:

HID: intel-ish-hid: Fix use-after-free issue in ishtp_hid_remove()

The system can experience a random crash a few minutes after the driver is removed. This issue occurs due to improper handling of memory freeing in the ishtp_hid_remove() function.

The function currently frees the driver_data directly within the loop that destroys the HID devices, which can lead to accessing freed memory. Specifically, hid_destroy_device() uses driver_data when it calls hid_ishtp_set_feature() to power off the sensor, so freeing driver_data beforehand can result in accessing invalid memory.

This patch resolves the issue by storing the driver_data in a temporary variable before calling hid_destroy_device(), and then freeing the driver_data after the device is destroyed.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/01b18a330cda61cc21423a7d1af92cf31ded8f60
• https://git.kernel.org/stable/c/07583a0010696a17fb0942e0b499a62785c5fc9f
• https://git.kernel.org/stable/c/0c1fb475ef999d6c22fc3f963fdf20cb3ed1b03d
• https://git.kernel.org/stable/c/560f4d1299342504a6ab8a47f575b5e6b8345ada
• https://git.kernel.org/stable/c/cf1a6015d2f6b1f0afaa0fd6a0124ff2c7943394
• https://git.kernel.org/stable/c/d3faae7f42181865c799d88c5054176f38ae4625
• https://git.kernel.org/stable/c/dea6a349bcaf243fff95dfd0428a26be6a0fb44e
• https://git.kernel.org/stable/c/eb0695d87a81e7c1f0509b7d8ee7c65fbc26aec9