CVE-2021-47500: iio: mma8452: Fix trigger reference couting
First published: Fri May 24 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: iio: mma8452: Fix trigger reference couting The mma8452 driver directly assigns a trigger to the struct iio_dev. The IIO core when done using this trigger will call `iio_trigger_put()` to drop the reference count by 1. Without the matching `iio_trigger_get()` in the driver the reference count can reach 0 too early, the trigger gets freed while still in use and a use-after-free occurs. Fix this by getting a reference to the trigger before assigning it to the IIO device.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=4.2<4.4.295 | |
| Linux kernel | >=4.5<4.9.293 | |
| Linux kernel | >=4.10<4.14.258 | |
| Linux kernel | >=4.15<4.19.221 | |
| Linux kernel | >=4.20<5.4.165 | |
| Linux kernel | >=5.5<5.10.85 | |
| Linux kernel | >=5.11<5.15.8 | |
| Linux kernel | =5.15-rc1 | |
| Linux kernel | =5.15-rc2 | |
| Linux kernel | =5.15-rc3 | |
| Linux kernel | =5.15-rc4 |
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Reference Links
- https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba
- https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96
- https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb
- https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8
- https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e
- https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1
- https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739
- https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892
Frequently Asked Questions
What is the severity of CVE-2021-47500?
CVE-2021-47500 has been rated with medium severity due to its potential impact on the integrity of kernel operations.
How do I fix CVE-2021-47500?
To mitigate CVE-2021-47500, you should upgrade to the latest stable version of the Linux kernel that addresses this vulnerability.
Which Linux kernel versions are affected by CVE-2021-47500?
CVE-2021-47500 affects Linux kernel versions from 4.2 to 5.15-rc4, including several ranges within these versions.
What type of vulnerability is CVE-2021-47500?
CVE-2021-47500 is classified as a reference counting issue in the Linux kernel's IIO subsystem.
Are there any known exploits for CVE-2021-47500?
As of now, there are no publicly available exploits for CVE-2021-47500, but it is advisable to apply mitigation measures promptly.
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