CVE-2025-38002

Description

A flaw was found in the Linux kernel's io_uring/fdinfo component. A race condition exists in the io_uring_show_fdinfo() function, which occurs when the io_uring is actively being resized. This allows a highly privileged local attacker to read inconsistent or partially updated data from /proc//fdinfo/. This could lead to potential information leaks or system instability.

Statement

This patch resolves a race condition in io_uring_show_fdinfo() that could lead to inconsistent or partially updated data being read from /proc//fdinfo/ when the ring was being concurrently resized. The race was caused by accessing shared context fields without always holding uring_lock. The fix ensures the function only proceeds if it can safely acquire the mutex. This mitigates potential information leaks or instability during concurrent io_uring activity and fdinfo inspection. The vulnerability is only exploitable by processes with high privileges, as it requires access to io_uring resources, use of IORING_REGISTER_RESIZE_RINGS, and the ability to read from /proc//fdinfo/, all of which are typically restricted to privileged users or the process owner.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score4.45.57.8
Attack VectorLocalLocalLocal
Attack ComplexityLowLowLow
Privileges RequiredHighLowLow
User InteractionNoneNoneNone
ScopeUnchangedUnchangedUnchanged
ConfidentialityHighNoneHigh
Integrity ImpactNoneNoneHigh
Availability ImpactNoneHighHigh

Vector

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

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

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

Understanding the Weakness (CWE)

CWE-821

Integrity,Confidentiality,Other

Technical Impact: Modify Application Data; Read Application Data; Alter Execution Logic

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