CVE-2021-47500

HIGH
Published May 24, 2024 Modified Jan 6, 2025 CWE-416

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.

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CVSS v3.1 Score

7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96

Frequently Asked Questions

What is CVE-2021-47500? +
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. It has a CVSS v3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-47500? +
CVE-2021-47500 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2021-47500? +
CVE-2021-47500 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-47500? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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