Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.2, < 4.4.295 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071baPatch
- https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcbPatch
- https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5ePatch
- https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739Patch
- https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892Patch
- https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1Patch
- https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8Patch
- https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96Patch
- https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071baPatch
- https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcbPatch
- https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5ePatch
- https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739Patch
- https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892Patch
- https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1Patch
- https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8Patch
FAQ
What is CVE-2021-47500?
CVE-2021-47500 is a vulnerability with a CVSS score of 7.8 (HIGH). 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...
How severe is CVE-2021-47500?
CVE-2021-47500 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47500?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.