CVE-2025-21871

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> tee: optee: Fix supplicant wait loop<br /> <br /> OP-TEE supplicant is a user-space daemon and it&amp;#39;s possible for it<br /> be hung or crashed or killed in the middle of processing an OP-TEE<br /> RPC call. It becomes more complicated when there is incorrect shutdown<br /> ordering of the supplicant process vs the OP-TEE client application which<br /> can eventually lead to system hang-up waiting for the closure of the<br /> client application.<br /> <br /> Allow the client process waiting in kernel for supplicant response to<br /> be killed rather than indefinitely waiting in an unkillable state. Also,<br /> a normal uninterruptible wait should not have resulted in the hung-task<br /> watchdog getting triggered, but the endless loop would.<br /> <br /> This fixes issues observed during system reboot/shutdown when supplicant<br /> got hung for some reason or gets crashed/killed which lead to client<br /> getting hung in an unkillable state. It in turn lead to system being in<br /> hung up state requiring hard power off/on to recover.