CVE-2025-38002

Description

From CVE.org

In the Linux kernel, the following vulnerability has been resolved: io_uring/fdinfo: grab ctx->uring_lock around io_uring_show_fdinfo() Not everything requires locking in there, which is why the 'has_lock' variable exists. But enough does that it's a bit unwieldy to manage. Wrap the whole thing in a ->uring_lock trylock, and just return with no output if we fail to grab it. The existing trylock() will already have greatly diminished utility/output for the failure case. This fixes an issue with reading the SQE fields, if the ring is being actively resized at the same time.

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

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