CVE-2025-71140

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0a2dc707aa42214f9c4827bd57e344e29a0841d6 < 2c1ea6214827041f548279c9eda341eda0cc8351affected
LinuxLinux6467cda18c9f9b5f2f9a0aa1e2861c653e41f382 < b92c19675f632a41af1222027a231bc2b7efa7edaffected
LinuxLinux6467cda18c9f9b5f2f9a0aa1e2861c653e41f382 < 3e858938b0e659f6ec9ddcf853a87f1c5c3f44e1affected
LinuxLinux6467cda18c9f9b5f2f9a0aa1e2861c653e41f382 < a5844227e0f030d2af2d85d4aed10c5eca6ca176affected
LinuxLinux23aaf824121055ba81b55f75444355bd83c8eb38affected
LinuxLinux41671f0c0182b2bae74ca7e3b0f155559e3e2fc5affected
LinuxLinux51c84a8aac6e3b59af2b0e92ba63cabe2e641a2daffected
LinuxLinux6.6.27 < 6.6.120affected
LinuxLinux6.8.6 < 6.9affected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux6.6.120 <= 6.6.*unaffected
LinuxLinux6.12.64 <= 6.12.*unaffected
LinuxLinux6.18.4 <= 6.18.*unaffected
LinuxLinux6.19 <= *unaffected

Weaknesses

References