CVE-2026-89941

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.

Score

CVSS 3.1 7.8 High

Status

Received - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-16

Last modified

2026-10-19

Affected products

• Linux Kernel (Linux)

References

• https://git.kernel.org/stable/c/311595dc0b5621f74d8eb4dc38ef4efcdfe7e769
• https://git.kernel.org/stable/c/06a9460b8b792e109cbc934a856d02e5cff217ef
• https://git.kernel.org/stable/c/11cef99491117d4264603df159c4ff5f3845a059
• https://git.kernel.org/stable/c/8662e56c31cf23b61ca3d11b516efb94c35b8026