CVE-2022-49478: media: pvrusb2: fix array-index-out-of-bounds in pvr2_i2c_core_init
First published: Wed Feb 26 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: media: pvrusb2: fix array-index-out-of-bounds in pvr2_i2c_core_init Syzbot reported that -1 is used as array index. The problem was in missing validation check. hdw->unit_number is initialized with -1 and then if init table walk fails this value remains unchanged. Since code blindly uses this member for array indexing adding sanity check is the easiest fix for that. hdw->workpoll initialization moved upper to prevent warning in __flush_work.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=2.6.18<4.9.318 | |
| Linux Kernel | >=4.10<4.14.283 | |
| Linux Kernel | >=4.15<4.19.247 | |
| Linux Kernel | >=4.20<5.4.198 | |
| Linux Kernel | >=5.5<5.10.121 | |
| Linux Kernel | >=5.11<5.15.46 | |
| Linux Kernel | >=5.16<5.17.14 | |
| Linux Kernel | >=5.18<5.18.3 |
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Reference Links
- https://git.kernel.org/stable/c/4351bfe36aba9fa7dc9d68d498d25d41a0f45e67
- https://git.kernel.org/stable/c/2e004fe914b243db41fa96f9e583385f360ea58e
- https://git.kernel.org/stable/c/a3660e06675bccec4bf149c7229ea1d491ba10d7
- https://git.kernel.org/stable/c/1310fc3538dcc375a2f46ef0a438512c2ca32827
- https://git.kernel.org/stable/c/a3304766d9384886e6d3092c776273526947a2e9
- https://git.kernel.org/stable/c/3309c2c574e13b21b44729f5bdbf21f60189b79a
- https://git.kernel.org/stable/c/f99a8b1ec0eddc2931aeaa4f490277a15b39f511
- https://git.kernel.org/stable/c/24e807541e4a9263ed928e6ae3498de3ad43bd1e
- https://git.kernel.org/stable/c/471bec68457aaf981add77b4f590d65dd7da1059
Frequently Asked Questions
What is the severity of CVE-2022-49478?
CVE-2022-49478 is classified as a low severity vulnerability in the Linux kernel.
How do I fix CVE-2022-49478?
To fix CVE-2022-49478, update the Linux kernel to a version that includes the patch addressing the array-index-out-of-bounds issue.
What does CVE-2022-49478 affect?
CVE-2022-49478 affects the pvrusb2 driver within the Linux kernel, specifically concerning the initialization of the unit number.
What causes CVE-2022-49478?
CVE-2022-49478 is caused by a missing validation check that allows -1 to be used as an array index.
Is CVE-2022-49478 a remote exploit risk?
CVE-2022-49478 does not present a significant remote exploit risk but can lead to denial of service.
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