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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.24% probability · 16th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
- https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.