CVE-2026-89940
HighCVSS 7.8Summary
In the Linux kernel, in the IIO buffer subsystem, the iio_dma_fence implementation uses a lock embedded in iio_dmabuf_priv, but iio_dma_fence can outlive iio_dmabuf_priv, causing a use-after-free. The fix ties the lifetime of the lock to the lifetime of the fence by embedding them in the same struct.
Risk Assessment
Use-after-free can lead to memory corruption, system crashes, or potential arbitrary code execution in kernel context.
Recommendation
Update the Linux kernel to a version containing the fix that embeds the lock and fence in the same struct, ensuring consistent lifetime.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: iio: buffer: Tie IIO dma fence lock lifetime to the fence The `iio_dma_fence` implementation currently uses a lock embedded in the `iio_dmabuf_priv`. But the `iio_dma_fence` can outlive the `iio_dmabuf_priv`, which can cause a use-after-free. Tie the lifetime of the lock to the lifetime of the fence by embedding them in the same struct. We can't just hold a reference to the `iio_dmabuf_priv` from the `iio_dma_fence` since `iio_buffer_dmabuf_release()` might sleep and the fence release callback is not allowed to sleep. Note that the `dma_fence` framework now has an internal lock that gets used when the passing `NULL` for `lock` in `dma_fence_init()`, but in order to allow this patch to be backportable use an external lock.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS