| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-21871: tee: optee: Fix supplicant wait loop |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21871 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.12 with commit 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 and fixed in 5.4.291 with commit 3eb4911364c764572e9db4ab900a57689a54e8ce |
| Issue introduced in 4.12 with commit 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 and fixed in 5.10.235 with commit 0180cf0373f84fff61b16f8c062553a13dd7cfca |
| Issue introduced in 4.12 with commit 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 and fixed in 5.15.179 with commit c0a9a948159153be145f9471435695373904ee6d |
| Issue introduced in 4.12 with commit 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 and fixed in 6.1.130 with commit ec18520f5edc20a00c34a8c9fdd6507c355e880f |
| Issue introduced in 4.12 with commit 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 and fixed in 6.6.80 with commit d61cc1a435e6894bfb0dd3370c6f765d2d12825d |
| Issue introduced in 4.12 with commit 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 and fixed in 6.12.17 with commit fd9d2d6124c293e40797a080adf8a9c237efd8b8 |
| Issue introduced in 4.12 with commit 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 and fixed in 6.13.5 with commit 21234efe2a8474a6d2d01ea9573319de7858ce44 |
| Issue introduced in 4.12 with commit 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 and fixed in 6.14 with commit 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-21871 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/tee/optee/supp.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/3eb4911364c764572e9db4ab900a57689a54e8ce |
| https://git.kernel.org/stable/c/0180cf0373f84fff61b16f8c062553a13dd7cfca |
| https://git.kernel.org/stable/c/c0a9a948159153be145f9471435695373904ee6d |
| https://git.kernel.org/stable/c/ec18520f5edc20a00c34a8c9fdd6507c355e880f |
| https://git.kernel.org/stable/c/d61cc1a435e6894bfb0dd3370c6f765d2d12825d |
| https://git.kernel.org/stable/c/fd9d2d6124c293e40797a080adf8a9c237efd8b8 |
| https://git.kernel.org/stable/c/21234efe2a8474a6d2d01ea9573319de7858ce44 |
| https://git.kernel.org/stable/c/70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 |
