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Medium severity5.5NVD Advisory· Published Sep 16, 2025· Updated Jun 17, 2026

CVE-2025-39816

CVE-2025-39816

Description

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

io_uring/kbuf: always use READ_ONCE() to read ring provided buffer lengths

Since the buffers are mapped from userspace, it is prudent to use READ_ONCE() to read the value into a local variable, and use that for any other actions taken. Having a stable read of the buffer length avoids worrying about it changing after checking, or being read multiple times.

Similarly, the buffer may well change in between it being picked and being committed. Ensure the looping for incremental ring buffer commit stops if it hits a zero sized buffer, as no further progress can be made at that point.

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Affected products

62

Patches

Vulnerability mechanics

References

4

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