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CVE-2026-89941: iio: buffer: Make IIO DMA fence release RCU-safe

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

Description

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.

Affected products

• Linux kernel: 6.11 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

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

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