Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: mediatek: vcodec: Use spinlock for context list protection lock Previously a mutex was added to protect the encoder and decoder context lists from unexpected changes originating from the SCP IP block, causing the context pointer to go invalid, resulting in a NULL pointer dereference in the IPI handler. Turns out on the MT8173, the VPU IPI handler is called from hard IRQ context. This causes a big warning from the scheduler. This was first reported downstream on the ChromeOS kernels, but is also reproducible on mainline using Fluster with the FFmpeg v4l2m2m decoders. Even though the actual capture format is not supported, the affected code paths are triggered. Since this lock just protects the context list and operations on it are very fast, it should be OK to switch to a spinlock.
References
- https://git.kernel.org/stable/c/2c1ea6214827041f548279c9eda341eda0cc8351
- https://git.kernel.org/stable/c/3e858938b0e659f6ec9ddcf853a87f1c5c3f44e1
- https://git.kernel.org/stable/c/a5844227e0f030d2af2d85d4aed10c5eca6ca176
- https://git.kernel.org/stable/c/b92c19675f632a41af1222027a231bc2b7efa7ed
FAQ
What is CVE-2025-71140?
CVE-2025-71140 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: media: mediatek: vcodec: Use spinlock for context list protection lock Previously a mutex was added to protect the encoder and dec...
How severe is CVE-2025-71140?
CVSS scoring is not yet available for CVE-2025-71140. Check NVD for updates.
Is there a patch for CVE-2025-71140?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.