CVE-2025-21871

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue concerns the OP-TEE supplicant, a user-space daemon in the Linux kernel, which can become hung, crashed, or killed during an OP-TEE RPC call. This can lead to a system hang-up due to incorrect shutdown ordering between the supplicant process and the OP-TEE client application. The problem allows a client process waiting in the kernel for a supplicant response to be killed, rather than waiting indefinitely. This fix addresses issues observed during system reboot or shutdown when the supplicant gets hung or crashed, resulting in the client becoming unkillable and the system requiring a hard power off/on to recover.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.