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CVE-2025-39698

Severity CVSS v4.0:
Pending analysis
Type:
CWE-416 Use After Free
Publication date:
05/09/2025
Last modified:
25/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> io_uring/futex: ensure io_futex_wait() cleans up properly on failure<br /> <br /> The io_futex_data is allocated upfront and assigned to the io_kiocb<br /> async_data field, but the request isn&amp;#39;t marked with REQ_F_ASYNC_DATA<br /> at that point. Those two should always go together, as the flag tells<br /> io_uring whether the field is valid or not.<br /> <br /> Additionally, on failure cleanup, the futex handler frees the data but<br /> does not clear -&gt;async_data. Clear the data and the flag in the error<br /> path as well.<br /> <br /> Thanks to Trend Micro Zero Day Initiative and particularly ReDress for<br /> reporting this.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.44 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.16.4 (excluding)
cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools