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CVE-2026-89941

Updated on 16 Sep 2026

Severity

7.8 High severity

Details

CVSS score
7.8
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

iio: buffer: Make IIO DMA fence release RCU-safe

The dma_fence documentation states that if a custom release implementation is provided, the dma_fence object must be freed in an RCU-safe way. The current iio_dma_fence implementation uses kfree(), which might result in a use-after-free.

Remove the custom release implementation. This makes the DMA fence core fall back to dma_fence_free(), which calls kfree_rcu() on the fence. This requires that the fence be the first member of struct iio_dma_fence.

Using the default release method for extended DMA fence structures is a common pattern.

Details

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
Debian 13 Released
17 kernels
  • 6.12.85-1
  • 6.12.86-1
  • 6.12.88-1
  • 6.12.74-2
  • 6.12.73-1
  • 6.12.63-1
  • 6.12.69-1
  • 6.12.74-1
  • 6.12.90-1
  • 6.12.90-2
  • 6.12.94-1
  • 6.12.95-1
  • 6.12.96-1
  • 6.12.100-1
  • 6.12.101-1
  • 6.12.105-1
  • 6.12.107-1
Ubuntu 26.04 Planned —