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CVE-2025-21871 – OP-TEE Linux Kernel Hang-Up Vulnerability

The following table lists the changes that have been made to the
CVE-2025-21871 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Mar. 27, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    tee: optee: Fix supplicant wait loop

    OP-TEE supplicant is a user-space daemon and it’s possible for it
    be hung or crashed or killed in the middle of processing an OP-TEE
    RPC call. It becomes more complicated when there is incorrect shutdown
    ordering of the supplicant process vs the OP-TEE client application which
    can eventually lead to system hang-up waiting for the closure of the
    client application.

    Allow the client process waiting in kernel for supplicant response to
    be killed rather than indefinitely waiting in an unkillable state. Also,
    a normal uninterruptible wait should not have resulted in the hung-task
    watchdog getting triggered, but the endless loop would.

    This fixes issues observed during system reboot/shutdown when supplicant
    got hung for some reason or gets crashed/killed which lead to client
    getting hung in an unkillable state. It in turn lead to system being in
    hung up state requiring hard power off/on to recover.
    Added Reference https://git.kernel.org/stable/c/0180cf0373f84fff61b16f8c062553a13dd7cfca
    Added Reference https://git.kernel.org/stable/c/21234efe2a8474a6d2d01ea9573319de7858ce44
    Added Reference https://git.kernel.org/stable/c/3eb4911364c764572e9db4ab900a57689a54e8ce
    Added Reference https://git.kernel.org/stable/c/70b0d6b0a199c5a3ee6c72f5e61681ed6f759612
    Added Reference https://git.kernel.org/stable/c/c0a9a948159153be145f9471435695373904ee6d
    Added Reference https://git.kernel.org/stable/c/d61cc1a435e6894bfb0dd3370c6f765d2d12825d
    Added Reference https://git.kernel.org/stable/c/ec18520f5edc20a00c34a8c9fdd6507c355e880f
    Added Reference https://git.kernel.org/stable/c/fd9d2d6124c293e40797a080adf8a9c237efd8b8
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