CVE-2025-21837

kernel: io_uring/uring_cmd: unconditionally copy SQEs at prep time

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Severity

Low

Red Hat Product Security

6.1

CVSS 3.1

Review impact separately from score.

Published · March 7, 2025

Updated · October 31, 2026

Description

A flaw was found in the Linux kernel. A local user could exploit this flaw to cause data corruption by reusing a submission queue entry (SQE) before the corresponding command completes. This issue occurs because the io_uring command handler accesses data from the original entry after the preparation phase without maintaining a stable copy, resulting in the kernel reading stale data.

Statement

This CVE has been marked as Rejected by the assigning CNA.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition