# CVE-2025-71140: linux: In the Linux kernel, the following vulnerability has been resolved:  media: mediatek: vcodec: Use spinlock for contex...

CVE-2025-71140 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-71140, released January 14, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-71140
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 14, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.69-1 | [DEBIAN-CVE-2025-71140](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71140.md) | Jan 14, 2026 |
| Linux | linux Debian 14 | 6.18.5-1 | [DEBIAN-CVE-2025-71140](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71140.md) | Jan 14, 2026 |

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Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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