CVE-2025-39822: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: fix signedness in this_len calculation When importing and using buffers, buf->len is considered unsigned. However, buf->len is converted to signed int when committing. This can lead to unexpected behavior if the buffer is large enough to be interpreted as a negative value. Make min_t calculation unsigned.

Affected products

• Linux Linux Kernel: from 6.12, before 6.16.5 (fixed in 6.16.5); version 6.17 only

Published 2025-09-16. Last modified 2026-06-17.