UBUNTU-CVE-2025-71140
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.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
50 explicit affected versions
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6 explicit affected versions
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10 explicit affected versions
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26 explicit affected versions
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35 explicit affected versions
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13 explicit affected versions
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1 explicit affected versions
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10 explicit affected versions
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36 explicit affected versions
16 explicit affected versions
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37 explicit affected versions
10 explicit affected versions
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13 explicit affected versions
35 explicit affected versions
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11 explicit affected versions
26 explicit affected versions
6 explicit affected versions
13 explicit affected versions
29 explicit affected versions
13 explicit affected versions
12 explicit affected versions
36 explicit affected versions
36 explicit affected versions
3 explicit affected versions
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23 explicit affected versions
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11 explicit affected versions
5 explicit affected versions
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11 explicit affected versions
5 explicit affected versions
10 explicit affected versions
26 explicit affected versions
34 explicit affected versions
30 explicit affected versions
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11 explicit affected versions
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13 explicit affected versions
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16 explicit affected versions
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3 explicit affected versions
7 explicit affected versions
10 explicit affected versions
51 explicit affected versions
11 explicit affected versions
18 explicit affected versions
37 explicit affected versions
12 explicit affected versions
3 explicit affected versions
27 explicit affected versions
38 explicit affected versions
8 explicit affected versions
5 explicit affected versions
8 explicit affected versions
10 explicit affected versions
7 explicit affected versions
41 explicit affected versions
13 explicit affected versions
13 explicit affected versions
7 explicit affected versions
8 explicit affected versions
10 explicit affected versions
12 explicit affected versions
9 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
45 explicit affected versions
37 explicit affected versions
46 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
12 explicit affected versions
11 explicit affected versions
34 explicit affected versions
15 explicit affected versions
9 explicit affected versions
8 explicit affected versions
7 explicit affected versions
4 explicit affected versions
3 explicit affected versions
1 explicit affected versions
13 explicit affected versions
43 explicit affected versions
9 explicit affected versions
10 explicit affected versions
8 explicit affected versions
40 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
9 explicit affected versions
11 explicit affected versions
1 explicit affected versions
14 explicit affected versions
34 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- 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
- https://ubuntu.com/security/CVE-2025-71140
- https://ubuntu.com/security/notices/USN-8177-1
- https://ubuntu.com/security/notices/USN-8177-2
- https://ubuntu.com/security/notices/USN-8179-1
- https://ubuntu.com/security/notices/USN-8179-2
- https://ubuntu.com/security/notices/USN-8179-3
- https://ubuntu.com/security/notices/USN-8179-4
- https://ubuntu.com/security/notices/USN-8183-1
- https://ubuntu.com/security/notices/USN-8183-2
- https://ubuntu.com/security/notices/USN-8184-1
- https://ubuntu.com/security/notices/USN-8185-1
- https://ubuntu.com/security/notices/USN-8185-2
- https://ubuntu.com/security/notices/USN-8203-1
- https://ubuntu.com/security/notices/USN-8204-1
- https://ubuntu.com/security/notices/USN-8245-1
- https://ubuntu.com/security/notices/USN-8257-1
- https://ubuntu.com/security/notices/USN-8258-1
- https://ubuntu.com/security/notices/USN-8260-1
- https://ubuntu.com/security/notices/USN-8261-1
- https://ubuntu.com/security/notices/USN-8265-1
- https://ubuntu.com/security/notices/USN-8440-1
- https://www.cve.org/CVERecord?id=CVE-2025-71140