CVE-2025-39698 Affecting kernel package, versions <0:5.14.0-570.49.1.el9_6


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.03% (6th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ALMALINUX9-KERNEL-13205766
  • published3 Oct 2025
  • disclosed29 Sept 2025

Introduced: 29 Sep 2025

NewCVE-2025-39698  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 kernel to version 0:5.14.0-570.49.1.el9_6 or higher.
This issue was patched in ALSA-2025:16880.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

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

io_uring/futex: ensure io_futex_wait() cleans up properly on failure

The io_futex_data is allocated upfront and assigned to the io_kiocb async_data field, but the request isn't marked with REQ_F_ASYNC_DATA at that point. Those two should always go together, as the flag tells io_uring whether the field is valid or not.

Additionally, on failure cleanup, the futex handler frees the data but does not clear ->async_data. Clear the data and the flag in the error path as well.

Thanks to Trend Micro Zero Day Initiative and particularly ReDress for reporting this.

CVSS Base Scores

version 3.1