CVE-2025-39822

MEDIUM

Linux Kernel 6.12-6.16.5 - Integer Overflow in io_uring kbuf this_len Calculation

Title source: llm

Description

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.

References (2)

Core 2

Core References

Patch

https://git.kernel.org/stable/c/f4f411c068402c370c4f9a9d4950a97af97bbbb1

Patch

https://git.kernel.org/stable/c/c64eff368ac676e8540344d27a3de47e0ad90d21

Scores

CVSS v3 5.5

EPSS 0.0012

EPSS Percentile 2.1%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

Status published

Products (10)

linux/Kernel 6.15.0 - 6.16.5linux

Linux/Linux < 6.15

Linux/Linux 6.15

Linux/Linux 6.16.5 - 6.16.*

Linux/Linux 6.17

Linux/Linux c4dbca5be33c6203d2f611dbd7502f887e4cd954

Linux/Linux cf9536e550dd243a1681fdbf804221527da20a80 - c64eff368ac676e8540344d27a3de47e0ad90d21

Linux/Linux cf9536e550dd243a1681fdbf804221527da20a80 - f4f411c068402c370c4f9a9d4950a97af97bbbb1

linux/linux_kernel 6.17 rc1 (3 CPE variants)

linux/linux_kernel 6.12 - 6.16.5

Published Sep 16, 2025

Tracked Since Feb 18, 2026